1. Which of the following statement is true?
A. Casting is the replica of the object to be cast
B. Pattern is the replica of the casting object
C. Casting and the pattern are same things
D. Molten material is casted into the casting cavity
Answer:B
2. Which of the following carries the mould cavity where the metal is to be poured?
A. Casting
B. Pattern
C. Sand
D. Core
Answer:B
3. Which of the following is ‘not’ an allowance given to the pattern for casting?
A. Shrinkage
B. Draft
C. Hole
D. Machining
Answer:D
6. The quality of the final product is not dependent on _______________
A. Method of withdrawal of pattern
B. Allowance provided to the pattern
C. The complexity of the casting
D. The metal used in Casting
Answer:D
7. The life of a pattern is most likely to depend upon which of the following term?
A. Number of castings produced
B. Type of cooling rate of the casting
C. Size of the casting
D. Size of the pattern
Answer:A
8. What is the function of cores in the casting process?
A. To support the pattern
B. To provide differential cooling rates at specific portions
C. To make holes and cavities
D. For ease of flow of the molten material
Answer:D
9. Which of the following is ‘not’ an advantage of the usage of pattern in a casting of metals?
A. Using patterns to cast objects, less time is consumed for mass production
B. It is cost efficient and profitable for mass production
C. Production of the pattern requires extra effort to cast the object
D. Cores in the pattern could be used to decrease the amount of machining done for making cavities
Answer:D
10. A draft allowance is provided to ___________
A. All linear faces
B. Only the interior dimensions
C. Only the exterior dimensions
D. Only the dimensions that are perpendicular to the parting plane
Answer:D
11. Which of the following is not a part of the pattern at most times?
A. Mould cavity
B. Cope
C. Molten metal
D. Core
Answer:D
12. Which of the following does not serve the purpose of using patterns in sand casting?
A. Contain core prints if the casting requires a core and need to be made hollow
B. To give the exact shape and size (in addition to the allowances) to the casting as that of the final object
C. Reduces the cost of production while used in mass production
D. Sometimes used to carry the mechanism to melt the metal/material which is to be poured into the cavity
Answer:D
13. The function of a gated pattern is ___________
A. To produce small castings in mass production
B. To create castings of a very heavy mass
C. To create castings containing complex design
D. To create symmetrical castings
Answer:A
14. Which of the following factors affect the choice of a pattern at most times?
A. Size and complexity of the casting
B. Characteristics of castings
C. Type of molding and castings method to be used
D. Type of cooling rates to be provided
Answer:D
15. Which of the following sequence is in the correct order to prepare a cast using the sand casting method?
[1] Mould making [2] Clamping [3] Pouring [4] Cooling [5] Trimming [6] Removal
A. 1,3,2,4,6,5
B. 2,1,3,4,5,6
C. 1,2,3,4,5,6
D. 1,2,3,4,6,5
Answer:D
16. What is a function of a riser in a sand casting?
A. Provide good mobility to the molten metal
B. Prevent cavities due to shrinkage
C. To develop holes or hollow cavities in the casting
D. To provide differential cooling rates in specific areas of the casting
Answer:B
17. Runners, gates and risers are attached to the pattern to __________
A. Provide ease of cooling
B. Provide feed to the molten material
C. Provide design to the casting
D. Enhance the finishing of the casting
Answer:B
18. Which of the following is considered to be light wood?
A. Mahogany
B. Maple
C. Birch
D. White Pine
Answer:D
19. Steel is an alloy of which two elements?
A. Iron and Brass
B. Brass and aluminium
C. Iron and carbon
D. Carbon and aluminium
Answer:D
20. Which of the following is not a limitation of wooden patterns?
A. Get abraded easily
B. Absorb moisture
C. Difficult machining
D. Poor wear resistance
Answer:D
21. Metal patterns have a longer life than wooden pattern.
A. True
B. False
Answer:A
22. Which of the following is not a limitation of metal patterns?
A. Get rusted
B. Obtain rough surface finish
C. Expensive
D. Heavy
Answer:B
9. Which of the following patterns do not withstand rough handling?
A. Aluminium
B. Cast iron
C. Brass
D. Steel
Answer:A
23. Which of the following has the lowest melting point?
A. Cast Iron
B. Steel
C. White Metal
D. Brass
Answer:D
24. Which of the following is the heaviest?
A. White
B. Brass
C. Cast Iron
D. Aluminium
Answer:B
25. In Solid casting method, the resin mixture is kept for how much time for hardening and curing?
A. 1-2 hours
B. 2-3 hours
C. 3-4 hours
D. 4-5 hours
Answer:B
26. Core boxes are made out of which pattern?
A. Plaster pattern
B. Wax pattern
C. Metal patterns
D. Polystyrene patterns
Answer:A
27. What should the sulphur level in foam plastic be?
A. More than 1%
B. Between 0.5% to 1%
C. Less than 0.1%
D. Between 0.1% to 0.5%
Answer:D
28. Which of the following patterns has high compressive strength?
A. Plastic pattern
B. Wax pattern
C. Polystyrene pattern
D. Plaster pattern
Answer:D
29. Pattern cannot be constructed out of which of the following materials?
A. Wood
B. Wax
C. Oil
D. Metal
Answer:D
30. Which of the following is not a criteria for selecting pattern materials?
A. Method of moulding
B. Establishment of parting line
C. Chances of repeat orders
D. Complexity of the casting
Answer:B
31. Which among the following wood is most widely used for making patterns?
A. White Pine
B. Mahogany
C. Teak
D. Maple
Answer:A
32. Which of the following factor is not considered while selecting a kind of pattern?
A. Quantity of casting
B. Types of moulding method
C. Shape of the casting
D. Nature of moulding process
Answer:D
33. Which type of pattern should be used for making stuffing box of the steam engine?
A. One piece pattern
B. Split Pattern
C. Sweep pattern
D. Gated pattern
Answer:A
34. In a three piece pattern moulding arrangement, what keeps the alignment between the two parts of the pattern?
A. Cope
B. Drag
C. Dowel pins
D. Cheek
Answer:D
35. Piston rings are produced using which pattern?
A. Sweep pattern
B. Gated pattern
C. Match plate pattern
D. Loose piece pattern
Answer:D
36. Match Plate pattern consumes more time in moulding operations than loose piece pattern.
A. True
B. False
Answer:B
37. Which of the following pattern operation is cheapest?
A. Sweep pattern
B. Gated pattern
C. Match plate pattern
D. Skeleton pattern
Answer:D
38. Which pattern operation is used for manufacturing wheel rims?
A. Follow board pattern
B. Segmental pattern
C. Sweep pattern
D. Gated pattern
Answer:B
39. The skeleton pattern is filled with sand.
A. True
B. False
Answer:A
40. Parting line in the sand casting should be ___________
A. Simple and curved
B. Simple and straight
C. Irregular
D. Any type will not make a difference
Answer:B
41. The designing of a pattern does not include which of the following feature?
A. To locate the direction of the parting line and adjust the component accordingly
B. To determine regions and measurement of draft angles and radii of the sharp edges where allowances are to be given
C. To recognize and abolish the region of or where the defects could take place during casting
D. To 3D print the design for making the pattern
Answer:D
42. The preferred shape of a runner in a sand casting is ___________
A. Cylindrical
B. Spherical
C. Rectangular
D. Trapezoidal
Answer:D
43. Riser for a sand casting can be designed using ___________
A. Modulus method
B. Cained method
C. Naval research laboratory method
D. All of the mentioned
Answer:D
44. Rat tails and buckles in sand casting are caused by __________
A. Lower strength of the solidified metal
B. Lower refractoriness of the moulding sand
C. Lower strength of the moulding sand
D. Lower hardness of the moulding sand
Answer:D
45. Gimlet is which of the following tool?
A. Clamping tools
B. Drilling tool
C. Sawing tool
D. Wood planing tool
Answer:B
46. Which of the following is not a drilling or boring tool?
A. Brace
B. Counter sink bit
C. Auger bit
D. Hand vice
Answer:D
47. Which of the following is not a wood planing tool?
A. Block plane
B. Scrub plane
C. Spokeshave
D. Centre bit
Answer:D
48. A mallet comes under which type of tool?
A. Drilling tool
B. Clamping tool
C. Other pattern maker’s tool
D. Sawing tool
Answer:D
49. Which of the following pattern making machine works on two pulleys?
A. Circular saw
B. Band saw
C. Wood turning lathe
D. Jig saw
Answer:B
50. Which of the following pattern making machine makes wooden board?
A. Jointer
B. Drill press
C. Mortiser
D. Scroll saw
Answer:A
51. Disc Sander is an abrasive type of machine.
A. True
B. False
Answer:A
52. Which of the following is not measuring, marking or layout tools?
A. Caliper
B. Trisquare
C. T-bevel
D. Compass Saw
Answer:D
53. Which of the following tool is not used for clamping purpose?
A. C-clamp
B. Trammels
C. Bar clamp
D. Hand Vice
Answer:B
54. Which of the following is not a sawing tool?
A. Coping saw
B. Pinch dog
C. Panel saw
D. Bow saw
Answer:B
55. Lack of filleting of sharp corners in the casting design can cause hot spots in the casting.
A. True
B. False
Answer:A
56. Sharp corners in casting design may cause defects in the casting but it helps in strengthening of pattern material.
A. True
B. False
Answer:B
Answer:A
57. In horizontally parted moulds, a draft is required for vertical as well as for horizontal surfaces of a pattern.
A. True
B. False
Answer:B
58. In casting design, concave junctions are generally added to avoid the effect of sharp corners in the casting.
A. True
B. False
Answer:A
59. In pattern fillets, the size of a fillet is usually determined by its width.
A. True
B. False
Answer:B
60. A very large fillet in casting design also may cause shrinkage defects in the casting.
A. True
B. False
Answer:A
61. Sharp internal corner of the casting also causes the misrun defect in the casting.
A. True
B. False
Answer:B
62. To avoid sharp external corners in casting design, rounding of external edges is done in pattern making that termed as radii.
A. True
B. False
Answer:A
63. In pattern making, the term used for rounding out of external edges of the pattern is called as a fillet.
A. True
B. False
Answer:B
64. Draft is generally provided to make a clearance between the pattern and the mould during pattern extraction.
A. True
B. False
Answer:A
65. It is not necessary to avoid any sharp internal corners from casting design, as it causes very negligible problems.
A. True
B. False
Answer:B
66. Which of the following ranges show the approx range of finishing depth (in mm) required for finished casting?
A. 2 to 20
B. 20 to 30
C. 30 to 35
D. 35 to 40
Answer:A
67. For finishing allowance, great care is taken while adding extra material to the molten metal.
A. True
B. False
Answer:A
68. Which of the following parts is used to keep the casting in for reducing the finishing allowance?
A. Centrifuge
B. Burette
C. Drag flask
D. Conical flask
Answer:D
69. Which of the following technologies is used in metal casting for reducing the product development time?
A. Radiography
B. UV radiation
C. Eddy current coiling
D. Rapid prototyping
Answer:D
70. After providing the finishing allowance to the metal casting, it is not necessary to include shake allowance as it can be covered by finishing allowance.
A. True
B. False
Answer:B
71. A Fillet is provided in the finishing of a pattern which is very small for shallow castings.
A. True
B. False
Answer:A
72. In finishing of a pattern, fillets are provided to eliminate the stresses completely from the metal casting.
A. True
B. False
Answer:B
73. Why is it important to take careful measurements/steps while storing the pattern?
A. They loose their shape and size
B. They get rusted
C. They get warped
D. All of the mentioned
Answer:D
74. Temperature and humidity should be _________
A. Very low
B. Very high
C. Be controlled accordingly
D. Is not a matter of concern
Answer:D
75. Time to time cleaning of stored pattern should be done by ___________
A. Distilled water
B. Dry cleaning
C. Treated with proper chemical fluids
D. Vegetable oils
Answer:B
76. To ease the storing and assembly which of the following method is used by industries?
A. Colour pattern
B. Scanned copy/Photo
C. Coding and numbered
D. No measurements are taken
Answer:D
77. Which of the following method(s) is obsolete for storing fragile patterns?
A. They must be stored in kerosene
B. They must be stored in wax plated shelves
C. They must be stored in a wood wardrobe
D. They must be stored in foam
Answer:D
78. Finishing allowance to a pattern is generally provided to avoid various defects in the casting.
A. True
B. False
Answer:B
80. Finishing also includes removal of scales from the surface of the casting.
A. True
B. False
Answer:A
81. Subsequent machining for products finishing does not require extra material to the metal casting, as it removes negligible amount of material from the casting.
A. True
B. False
Answer:B
82. Which colour is given to the cast surfaces which are to be left not-machined?
A. Red
B. Blue
C. Black
D. Yellow
Answer:D
83. Which colour is given to loose pieces and seatings?
A. Red strip on yellow base
B. Yellow strip on red base
C. Black strip on yellow base
D. Yellow strip on black base
Answer:A
Check this: Metallurgical Engineering Books | Casting, Forming and Welding I Books
84. Which colour is given to core prints seats?
A. Red
B. Blue
C. Yellow
D. Black
Answer:D
85. Which colour is given to stop-offs or supports?
A. Yellow strip on black background
B. Red strip on yellow background
C. Black strip on yellow background
D. Yellow strip on red background
Answer:D
86. Which colour is given to parting surfaces?
A. Red
B. Black
C. Yellow
D. No colour
Answer:D
87. Which colour is provided on core prints for machined openings?
A. Black strips on yellow background
B. Yellow strips on black background
C. Red strips on yellow background
D. Yellow strips on black background
Answer:B
88. Which colour is given for surfaces, yet to be machined in cast surface?
A. Red
B. Black
C. Yellow
D. No colour
Answer:A
89. Pattern surfaces have black colour.
A. True
B. False
Answer:B
90. While imparting colours to the patterns, which colour scheme is followed?
A. Indian
B. American
C. Australian
D. Britain
Answer:B
91. Which of the following reason is not valid for pattern colouring?
A. Identification of main body
B. Visualising the to be machined surface
C. Indication of the type of metal
D. Locating parting surface
Answer:D
92. Green colour is used for machined cast surface.
A. True
B. False
Answer:B
93. To join pieces of timber in width and thickness is called?
A. Pattern filling
B. Mortising
C. Building-up
D. Brazing
Answer:D
94. Building-up process is used for making what?
A. Shields and boards
B. Dowels
C. Round pins
D. Belts
Answer:A
95. Which method is used for locking planks and bars?
A. Mortising
B. Building-up
C. Soldering
D. Brazing
Answer:A
96. Wooden workpieces of a pattern set come in which of the following type?
A. Triangular
B. Circular
C. Hexagonal
D. Pentagonal
Answer:B
97. Rectangular wooden workpiece of a pattern set is not used for making?
A. Shields
B. Boards
C. Boxes
D. Drum type elements
Answer:D
98. Design of pattern elements and method of jointing depend on?
A. Strength
B. Hardness
C. Ductility
D. Brittleness
Answer:A
99. What shape does fillet pieces have?
A. Convex
B. Concave
C. Convex and concave
D. Plane
Answer:B
100. What should the radius of fillet be to allow fillet sharp angles?
A. More than 15mm
B. Less than 10mm
C. Between 10mm and 15mm
D. More than 20mm
Answer:B
101. Mortising does locking at given angles.
A. True
B. False
Answer:A
102. Which of the following properties must a material possess to be used in mold making?
A. High refractoriness
B. Chemical and thermal stability
C. High permeability
D. All of the mentioned
Answer:D
103. Which of the following group of material type is used in mold making?
A. Metallic only
B. Non-Metallic only
C. Both metallic as well as non-metallic
D. Neither metallic nor non-metallic
Answer:D
104. Which of the following non-metallic material is not used in the synthesis of molds?
A. Magnesite
B. Silimanite
C. Zircon
D. Valcanised rubber
Answer:D
105. High refractoriness of a material refers to its __________
A. Slipperyness of the material
B. Chemical strength towards other material
C. Strength to withstand at high temperature
D. Ability to get dissolved in molten metal
Answer:D
106. Which of the following is a perfect composition of clay (Bentonite) used in moulding sand?
A. Al2O3
B. Al2O3.2SiO2
C. Al2O3.2H2O
D. Al2O3.2SiO2.2H2O
Answer:D
107. Which of the following material is not used for mold making?
A. Iron
B. Zinc
C. Mild steel
D. Alloy steel
Answer:B
108. Phosphorus is added to steel mold for which of the following reason?
A. It increases strength and hardness of steel
B. It increases refractoriness of steel
C. It increases porosity of steel
D. It increases finishing of steel
Answer:A
109. Which of the following is a perfect composition for medium carbon steel?
A. Upto 0.3%
B. 0.3-0.6%
C. 0.6-1.7%
D. 1.7-3%
Answer:B
110. A form of cast iron in which free carbon is present in the form of nodules in the matrix of cementite and ferrite. This form of cast iron is ____________
A. Malleable iron
B. Pig iron
C. Wrought iron
D. None of these
Answer:A
111. Which of the following percent of carbon is correct for Eutectoid steel (at 723oC in Fe3-C diag)?
A. 0.05%
B. 0.5%
C. 0.6%
D. 0.8%
Answer:D
112. Which of the following is not used as binders for mould materials?
A. Bentonite
B. Kaolinite
C. Backelite
D. Illite
Answer:D
113. Which of the following is not used as an additive?
A. Dextrin
B. Coal dust
C. Pitch
D. Zinc
Answer:D
114. Nitriding process is used to increase surface hardness for which of the following materials?
A. Alloy steels
B. Low carbon steels
C. Medium carbon steels
D. High carbon steels
Answer:A
115. The famous iron pillar located near Qutab Minar in New Delhi is made up of which material?
A. Stainless steel
B. Malleable iron
C. Mild steel
D. Wrought iron
Answer:B
116. Which of the following is not a source of moulding sand?
A. Sea
B. Lakes
C. Desert
D. Forests
Answer:D
117. Which of the following is not a type of moulding sand?
A. Red sand
B. Natural sand
C. Synthetic sand
D. Loam sand
Answer:A
118. What is the percentage composition of clay in natural sand?
A. 22-31%
B. 3-10%
C. 5-20%
D. 18-29%
Answer:D
119. What is the percentage composition of water in natural sands?
A. 2-4%
B. 5-8%
C. 6-9%
D. 10-13%
Answer:B
120. What is mixed with natural sand to make it semisynthetic sand?
A. Bentonite
B. Barelelne
C. Cubane
D. Prismane
Answer:A
121. Which sand is used for casting cast irons and non-ferrous metals?
A. Loam Sand
B. Natural Sand
C. Synthetic Sand
D. Refractory sand grain
Answer:B
122. Natural sands are economical than synthetic sands.
A. True
B. False
Answer:A
123. What is the amount of clay content in Loam sand?
A. 30%
B. 40%
C. 50%
D. 60%
Answer:D
124. Which sand is used for making ferrous and non-ferrous alloys?
A. Natural sand
B. Synthetic sand
C. Loam sand
D. Refractory sand grain
Answer:B
125. A general loam sand mixture contains how many volumes of silica?
A. 10
B. 20
C. 30
D. 40
Answer:B
126. Round grain has higher permeability than angular grains.
A. True
B. False
Answer:A
127. Clays are what type of binders?
A. Organic
B. Patented
C. Inorganic
D. Other binders
Answer:D
128. At what temperature does the clay dead burning take place?
A. 400°C – 500°C
B. 500°C – 600°C
C. 600°C – 700°C
D. 700°C – 800°C
Answer:B
129. What is the breadth size range of a clay particle?
A. 0.01-1 micrometres
B. 0.02-2 micrometres
C. 0.03-3 micrometres
D. 0.04-4 micrometres
Answer:A
130. Which of the following clay binders are most commonly used?
A. Bentonite
B. Illite
C. Limonite
D. Kaolinite
Answer:A
131. What is the percentage composition of quartz in Western bentonite?
A. 5%
B. 10%
C. 15%
D. 20%
Answer:B
132. What is the percentage composition of quartz in Southern bentonite?
A. 5%
B. 10%
C. 15%
D. 20%
Answer:D
133. What is the softening point of western montmorillonite?
A. 800°F – 1150°F
B. 1200°F – 1650°F
C. 1750°F – 2100°F
D. 2100°F – 2450°F
Answer:D
134. What is the softening point of western montmorillonite?
A. Above 1800°F
B. Above 2000°F
C. Above 2200°F
D. Above 2400°F
Answer:A
135. Illite has a softening point of about 4500°F.
A. True
B. False
Answer:B
136. On increasing the binder content, what in the moulding sand gets reduced?
A. Hardenability
B. Strength
C. Permeability
D. Brittleness
Answer:D
137. Which of the following is bentonite?
A. Kaolinite
B. Sodium Montmorillonite
C. Illite
D. Limonite
Answer:B
138. Which of the following is not a clay binder?
A. Limonite
B. Illite
C. Limonite
D. Carsil
Answer:D
139. Which of the following is not a characteristic property of any moulding sand?
A. Flowability
B. Hardenability
C. Green strength
D. Dry strength
Answer:B
140. What does a mould having adequate green strength, does not have?
A. Ability to retain its shape
B. Ability not to get distorted
C. Ability not to collapse
D. Ability to retain hardness
Answer:D
141. Dry sand does not have the strength for what functions?
A. To withstand corrosion forces
B. To withstand pressure of molten metal
C. To be able to retain its shape
D. To be able to retain the hardenability
Answer:D
142. Hot strength is seen at what temperature?
A. Above 212°F
B. Above 312°F
C. Above 412°F
D. Above 512°F
Answer:A
143. Which of the following would not happen if hot strength is not enough?
A. The mould may get hardened
B. The mould may get enlarged
C. The mould may get eroded
D. The mould may crack
Answer:A
144. Why should the moulding sand be porous?
A. For gases to enter
B. For gases to escape
C. For water to enter
D. For water to escape
Answer:B
145. Which of the following is not a defect if permeability is not enough?
A. Brittleness
B. Gas holes
C. Mould blast
D. Surface blows
Answer:A
146. In green sand what is the amount of water used?
A. 5%
B. 10%
C. 15%
D. 20%
Answer:A
147. What is the amount of clay needed in green sand?
A. 5% – 10%
B. 5% – 15%
C. 15% – 30%
D. 25% – 40%
Answer:D
148. Parting sand is a type of moulding sand.
A. True
B. False
Answer:A
149. At what temperature, does quartz melt completely?
A. 1725°C
B. 1925°C
C. 1825°C
D. 2025°C
Answer:A
150. Which of the following is the most porous sand?
A. Silica sand
B. Zircon
C. Olivine
D. Dolomite
Answer:A
150. At what temperature does the silica sand start expanding thermally?
A. 918°F
B. 843°F
C. 1063°F
D. 1124°F
Answer:D
151. Which of the following factor is not to be considered while selecting a refractory?
A. Conductivity
B. Expansion
C. Size of the particle
D. Permeability
Answer:D
152. Which sand is generally used repetitively for mould making?
A. Silica sand
B. Zircon
C. Olivine
D. Dolomite
Answer:A
153. Which of the following sand is freely available?
A. Silica sand
B. Zircon
C. Olivine
D. Dolomite
Answer:A
154. Silica sand is expensive.
A. True
B. False
Answer:B
155. Which of the following is not refractory sand?
A. Olivine
B. Silica Sand
C. Dolomite
D. Barium Chloride
Answer:D
156. Which refractory sand has the best moulding material?
A. Silica sand
B. Magnesite
C. Zircon
D. Olivine
Answer:A
157. Ganister is another name for which sand?
A. Magnesite
B. Zircon
C. Silica sand
D. Dolomite
Answer:D
158. Large particles in soil increase the chances of imperfection and brittle failure.
A. True
B. False
Answer:A
159. Which of the following equipment can be used for determining the grain size of soil particles?
A. Sprue
B. Gate
C. Runner
D. Sieve
Answer:D
160. Analysis of very small size grains of soil can also be possible by using sieves.
A. True
B. False
Answer:B
161. In a hydrometer test, a dispersing agent is mixed with water to increase its density.
A. True
B. False
Answer:A
162. It becomes easier to read the bottom part of the meniscus when the hydrometer is in a soil suspension.
A. True
B. False
Answer:B
163. In a hydrometer test, soil used should be dispersed first in order to eliminate particle coagulation.
A. True
B. False
Answer:A
164. The grain size distribution is mainly carried out to determine the strength and permeability of the soil.
A. True
B. False
Answer:A
165. The size and shape of particles in the soil cannot reflect material composition and grain formation.
A. True
B. False
Answer:B
167. The grain size distribution of soil basically determines inter-particle forces and its packing.
A. True
B. False
Answer:A
168. Quartz grains are generally fine or small in shape and size during analysis of quartz.
A. True
B. False
Answer:B
169. For bonding action of clays, what is the amount of water needed?
A. 1.5%-8%
B. 3.5%-11%
C. 4.5%-12%
D. 5.5%-13%
Answer:A
170. What is the amount of sea coal needed in cast irons for small casting moulding sands?
A. 1%
B. 2%
C. 3%
D. 4%
Answer:A
171. What is the amount of sea coal needed in cast irons for large green casting moulding sands?
A. 10%
B. 15%
C. 20%
D. 25%
Answer:A
172. At what temperature is pitch distilled from soft coals?
A. 400°F
B. 500°F
C. 600°F
D. 700°F
Answer:D
173. Pitch maybe used up to what percent?
A. 1%
B. 2%
C. 3%
D. 4%
Answer:B
174. Which of the following increases the dry strength of the sand?
A. Iron oxides
B. Fuel oils
C. Cereals
D. Dextrin and molasses
Answer:D
175. Cereals improve flowability and lower collapsibility.
A. True
B. False
Answer:B
177. How much should fuel oil be added to increase the moulding ability of sand?
A. 0.01% – 0.1%
B. 0.02% – 0.2%
C. 0.03% – 0.3%
D. 0.04% – 0.4%
Answer:A
178. Which of the following is not a bonding theory?
A. Electrostatic bonding theory
B. Hot strength theory
C. Surface tension theory
D. Block and wedge theory
Answer:B
179. In which of the following bonding theory, water molecules break down to form H+ and OH- ions?
A. Electrostatic bonding theory
B. Hot strength theory
C. Surface tension theory
D. Block and wedge theory
Answer:A
180. What does the clay particle absorb in electrostatic bonding theory?
A. Complete water
B. H+ ions
C. OH–ions
D. Sand grains
Answer:D
181. Kaolinite clay mineral generally adsorbs fewer ions than that of other clay minerals.
A. True
B. False
Answer:A
182. The layer structure of kaolinite mineral totally consists of three tetrahedral silicate sheets.
A. True
B. False
Answer:B
183. Which of the following members of clay minerals is formed by the decompositions of micas?
A. Chlorite
B. Illite
C. Kaolinite
D. Vermiculite
Answer:D
184. Which of the following types of clay mineral includes potassium in the layer structure?
A. Chlorite
B. Vermiculite
C. Illite
D. Kaolinite
Answer:D
185. Palygorskite and sepiolite clay minerals generally have similar fibrous structures.
A. True
B. False
Answer:A
186. Ball clay is a type of clay which has zero percent moisture or water content in it.
A. True
B. False
Answer:B
187. Repeated freezing and melting of fire clay can improve the plasticity of the clay material.
A. True
B. False
Answer:A
188. Which of the following materials presents in clay which imparts plasticity in it?
A. Silica
B. Phyllosilicates
C. Calcium
D. Sodium
Answer:B
189. Which of the following components of soil are acts as chemical sponges in the soil?
A. Clay minerals
B. Silica
C. Sodium
D. Potassium
Answer:A
190. The attraction of clay minerals with water is a surface phenomenon which is called absorption.
A. True
B. False
Answer:B
191. In dry sand moulding of steel casting, what is the bentonite percentage composition?
A. 1%
B. 2%
C. 4%
D. 5%
Answer:D
192. In dry sand moulding of steel casting, what is the dextrine percentage composition?
A. 0.5%
B. 1.5%
C. 2.5%
D. 3.5%
Answer:A
193. In green sand moulding of steel casting, what is the moisture percentage composition?
A. 2-3%
B. 3-4%
C. 4-5%
D. 5-6%
Answer:D
194. In synthetic sands of aluminium alloys, what is the bentonite percentage composition?
A. 2-5%
B. 3-5%
C. 4-5%
D. 5-6%
Answer:D
195. In gray iron castings of facing sand mixtures, what is the bentonite percentage composition?
A. 2-3%
B. 3-4%
C. 4-5%
D. 5-6%
Answer:A
196. In magnesium alloys, what is the bentonite percentage composition?
A. 1%
B. 2%
C. 3%
D. 4%
Answer:D
197. In magnesium alloys, the water content in percentage is 10%.
A. True
B. False
Answer:B
198. In the green sand moulding of steel casting, what is the bentonite percentage composition?
A. 1.5%
B. 2.5%
C. 3.5%
D. 4.5%
Answer:D
199. In the green sand moulding of steel casting, what is the dextrine percentage composition?
A. 0.5%
B. 1.5%
C. 2.5%
D. 3.5%
Answer:A
200. In the green sand moulding of steel casting, what is the moisture percentage composition?
A. 1% – 2%
B. 2% – 3%
C. 3% -4%
D. 4% – 5%
Answer:D
201. Foundry sands cannot be obtained in which of the following states?
A. Uttar Pradesh
B. Punjab
C. Orissa
D. Bihar
Answer:D
202. Foundry sand is found in which part of Maharashtra?
A. Satara
B. Mumbai
C. Nagpur
D. Nasik
Answer:A
203. Which of the following is not a core sand property?
A. Dry strength
B. Hardness
C. Low collapsibility
D. Good Permeability
Answer:D
204. Good friability is one of the properties of core sand.
A. True
B. False
Answer:A
205. Which of the following is not a core sand ingredient?
A. Water
B. Wax
C. Granular refractories
D. Core binders
Answer:B
206. What is the melting point of Zircon?
A. 3450°F – 4620°F
B. 3750°F – 4820°F
C. 3850°F – 4820°F
D. 4400°F – 5320°F
Answer:A
207. What is the melting point of Olivin?
A. 3450°F – 4620°F
B. 3200°F – 3450°F
C. 3100°F – 3220°F
D. 3400°F – 3620°F
Answer:B
208. What is the melting point of Chamotte?
A. 3450°F – 4620°F
B. 3200°F – 3450°F
C. 3100°F – 3200°F
D. 3400°F – 3620°F
Answer:D
209. What is the melting point of Silica, for granular refractories?
A. 3453°F
B. 3206°F
C. 3119°F
D. 3467°F
Answer:D
210. For the granular refractories, what is the melting point of Carbon?
A. 6800°F
B. 6200°F
C. 6400°F
D. 6500°F
Answer:D
211. What is the dry tensile strength of core sand mixture for general purpose?
A. 15 kg/cm2
B. 16 kg/cm2
C. 17 kg/cm2
D. 18 kg/cm2
Answer:D
212. What is the dry compression strength of core sand mixture for general purpose?
A. 50 kg/cm2
B. 60 kg/cm2
C. 70 kg/cm2
D. 80 kg/cm2
Answer:D
213. What is the green compression strength of core sand mixture for general purpose?
A. 1/5 kg/cm2
B. 1/6 kg/cm2
C. 1/7 kg/cm2
D. 1/8 kg/cm2
Answer:D
214. What is the green compression strength of light to medium size malleable iron castings?
A. 0.05 kg/cm2
B. 0.06 kg/cm2
C. 0.07 kg/cm2
D. 0.08 kg/cm2
Answer:D
215. What is the water content in light to medium size malleable iron castings?
A. 3.2%
B. 4.2%
C. 5.2%
D. 6.2%
Answer:B
216. What is the amount of green permeability in light to medium size malleable iron castings?
A. 34 cc/min
B. 44 cc/min
C. 54 cc/min
D. 64 cc/min
Answer:B
217. In light to medium size malleable iron castings, lake sand constitutes of 30 parts.
A. True
B. False
Answer:B
218. How much time does a centrifugal muller take to mix the core ingredients?
A. 20 – 50 seconds
B. 10 – 40 seconds
C. 50 – 80 seconds
D. 60 – 90 seconds
Answer:D
219. How much time does a normal muller take to mix the core ingredients?
A. 2 – 5 minutes
B. 3 – 6 minutes
C. 4 – 7 minutes
D. 5 – 9 minutes
Answer:B
220. What is the baked tensile strength of light to medium size malleable iron castings?
A. 4.5 kg/cm2
B. 5.5 kg/cm2
C. 6.5 kg/cm2
D. 7.5 kg/cm2
Answer:B
221. Which of the following process deals with mixing the molding sand elements?
A. Sand mixing
B. Sand preparation
C. Sand tempering
D. Sand conditioning
Answer:B
222. What is the temperature requirement of sand, for manufacturing?
A. Below 40°C
B. Below 50°C
C. Below 60°C
D. Below 70°C
Answer:A
223. To avoid difficulties in making of molds, sand should be cooled below what temperature?
A. 100°F
B. 120°F
C. 140°F
D. 160°F
Answer:A
224. What should be the accuracy of automatic moisture control for manufacturing sands?
A. ± 0.1%
B. ± 0.2%
C. ± 0.3%
D. ± 0.4%
Answer:A
225. A low speed muller is used in mechanized foundries.
A. True
B. False
Answer:B
226. How much time is taken by sand, for sand preparation in terms of muller time?
A. 33 to 50 percent of muller time
B. 14 to 29 percent of muller time
C. 25 to 40 percent of muller time
D. 46 to 62 percent of muller time
Answer:A
227. Air blasts are provided for forced cooling of sand after muller operation.
A. True
B. False
Answer:A
228. In sand preparation, which of the following is not used as an additive?
A. Clay
B. Cereal
C. Wax
D. Moisture
Answer:D
229. Which of the following process deals with the amount of moisture to be added?
A. Sand mixing
B. Sand preparation
C. Sand conditioning
D. Sand tempering
Answer:D
230. Which of the following process deals with preparation the mold sand?
A. Sand mixing
B. Sand preparation
C. Sand tempering
D. Sand conditioning
Answer:D
231. In a moisture content test, what amount of prepared sand is placed on the pan?
A. 10-40 grams
B. 20-50 grams
C. 30-60 grams
D. 40-70 grams
Answer:B
232. In a moisture content test, how is the prepared sand heated?
A. Flame heating
B. Ultraviolet heating
C. Infrared heating
D. Conduction heating
Answer:D
233. In a moisture content test, for how long should the sand in infrared heating bulb be heated?
A. 1 – 2 minutes
B. 2 – 3 minutes
C. 3 – 4 minutes
D. 4 – 5 minutes
Answer:B
234. In clay content determination of molding sand, which is the base solution used?
A. KOH
B. NaOH
C. Mg(OH)2
D. Ca(OH)2
Answer:B
235. How much distilled water is added to 3% NaOH solution in clay content determination of molding sand?
A. 450 cc
B. 475 cc
C. 500 cc
D. 550 cc
Answer:B
236. Grain distribution is not determined by the Grain fineness test.
A. True
B. False
Answer:B
237. Permeability of molding sand does not depend on which of the following factors?
A. Grain distribution
B. Degree of ramming
C. Binder contents
D. Amount of wax present
Answer:D
238. High moisture causes what in molding sands?
A. Increase in permeability
B. Decrease in permeability
C. Increase in hardness
D. Increase in strength
Answer:B
239. The pressure of which gas gives the reading of water content on the pressure gauge?
A. Methane
B. Acetone
C. Acetylene
D. Carbon dioxide
Answer:D
240. Calcium carbide reacts with moisture to give out which gas?
A. Acetylene gas
B. Methane
C. Carbon dioxide
D. Carbon monoxide
Answer:A
241. Which of the following is not a function of a core?
A. It is used to form internal cavities
B. It is used to form a part of green sand mould
C. It is used as a part of gating system
D. It is used as a part of furnace
Answer:D
242. Cores are subjected to severe thermal and mechanical conditions.
A. Completely true
B. Partially true
C. Completely false
D. Partially false
Answer:A
243. Which of the following is a function of a core in casting?
A. Interior cavitational passages in a casting
B. To shape an external part of a more intricate casting
C. To strengthen and improve inner and outer surface of the mold
D. All of the mentioned
Answer:D
244. A permeability of a core should be _________
A. Low
B. Moderate
C. High
D. Has no effect on casting
Answer:D
245. If a web of internal passageways and chambers is to be constructed which of the following element is most obsolete for use?
A. Cores
B. Core prints
C. Core boxes
D. Chaplets
Answer:A
246. Which of the following statement is true?
A. Cores are permanent
B. Cores are semi-permanent
C. Cores are permanent & semi-permanent
D. Cores are not permanent
Answer:D
247. Why are core prints added to the patterns when cores are used?
A. They provide different cooling rates to the core
B. They provide support to the cores and strength to the mould and core itself
C. They are used to ease the removal of a core
D. They are used to manufacture cores
Answer:B
248. A sand slinger works at a high speed.
A. True
B. False
Answer:A
249. Cylindrical cores are made using Dump core boxes.
A. True
B. False
Answer:B
250. In shell core making, the core box is heated up to what temperature?
A. 400°F – 600°F
B. 500°F – 700°F
C. 600°F – 800°F
D. 800°F – 1000°F
Answer:A
251. Which of the following is not a core machine?
A. Jolt machine
B. Core blower
C. Sand slinger
D. Mill setter
Answer:D
252. Which cores are made manually in hand filled core boxes?
A. Small sized-mass production
B. Small sized-limited production
C. Large sized-mass production
D. Large sized-limited production
Answer:B
253. Weak cores are reinforced using what?
A. Iron wires
B. Steel wires
C. Bronze wires
D. Cobalt wires
Answer:B
254. Which of the following equipment is used for both limited and mass production?
A. Core ovens
B. Dielectric bakers
C. Radiant bakers
D. Flame bakers
Answer:A
255. After preparation of cores, cores on the core plates are sent for what?
A. Pressurizing
B. Baking
C. Increasing the volume
D. Decreasing the volume
Answer:B
256. Cores are baked up to what temperature?
A. 600°F
B. 650°F
C. 700°F
D. 750°F
Answer:B
257. The moisture of the core is taken off during baking at what temperature?
A. 197°F
B. 212°F
C. 278°F
D. 304°F
Answer:B
258. Core oil and binders change their chemical properties at what temperature?
A. 200°F – 300°F
B. 300°F – 400°F
C. 400°F – 500°F
D. 500°F – 600°F
Answer:D
259. What does an unbacked core generate?
A. Greenhouse gases
B. Mold gases
C. Mold liquids
D. Ultraviolet rays
Answer:B
260. Using what are core ovens heated?
A. Gases or oils
B. Infrared heating
C. Ultraviolet heating
D. Solar heat
Answer:A
261. Drawer type core ovens are used for baking large sized cores.
A. True
B. False
Answer:B
262. Which of the following type of air is circulated over rack type core oven?
A. Cool air
B. Hot air
C. Compressed air
D. Odourless air
Answer:B
263. How are core manufactured in casting?
A. Cores are manufactured from a pattern in the same way as of mold
B. Cores are manufactured by machining process
C. Cores are manufactured by traditional methods
D. Cores are not manufactured, they are found naturally
Answer:A
264. What are the core boxes?
A. Used to support cores
B. Used to create cores
C. Used to store cores
D. Used to Eject cores while ejection of casting after solidification
Answer:B
265. In the case of coldbox core _____________
A. The core mix is heat treated in order to cure it
B. Core mix immediately gets cured after sand is blown
C. Time is given to the core mix to be cure
D. Cold water is poured onto the core mix
Answer:D
266. In the case of shell, hotbox or warmbox ______________
A. Hot water is poured onto the sand mixture
B. The sand mixture is heated to set the core
C. Steam is provided to the core mix
D. The corebox is left in the room temperature
Answer:B
267. What will happen if the parting line in the corebox is not closed properly?
A. Coresand may blow out of the box to create fins on the cores
B. The cope and drag part clamped will detach and break the core
C. Air inclusion occurs as the atmospheric air involves the solidification of core
D. Nothing will happen, as the parting line has no role in core making
Answer:A
268. Why the air already present inside the corebox is necessary to be evacuated before pressurised air is blown into it?
A. The air has comparatively low pressure hence, distortion occurs
B. Hot tears will occur on the surface
C. It will cause poor sand distribution and poor compaction
D. Nothing will happen as the pressure of incoming air neutralises inside air pressure
Answer:D
269. Why should the finishing of the core be made good enough?
A. The intricate shapes made are difficult for machine finishing
B. The size of the cavities and contours must be accurate to enable perfect assemblies
C. It reduces machining cost and time invested for that
D. All of the mentioned
Answer:D
270. Which of the following cores are produced by mixing silica?
A. Green sand cores
B. Dry sand cores
C. Oil bonded cores
D. Resin bonded cores
Answer:D
271. In resin bond cores, the core is baked at what temperature?
A. 275°F – 390°F
B. 375°F – 450°F
C. 485°F – 645°F
D. 775°F – 880°F
Answer:B
272. In hot box process, core box is heated up to what temperature?
A. 220°F – 300°F
B. 250°F – 320°F
C. 350°F – 500°F
D. 420°F – 550°F
Answer:D
273. Sodium silicate reacts with carbon dioxide to give what?
A. Sodium dichromate
B. Sodium sulphide
C. Sodium bicarbonate
D. Sodium carbonate
Answer:D
274. Silica gel is formed when sodium bicarbonate reacts with carbon monoxide.
A. True
B. False
Answer:B
275. What percentage of clay content is required in furan-no-bake system?
A. Less than 0.3%
B. Less than 0.4%
C. Less than 0.5%
D. Less than 0.6%
Answer:D
276. What percentage of powered ferrosilicon is mixed with sodium silicate bonded sand in Nishiyama process?
A. 1%
B. 2%
C. 3%
D. 4%
Answer:B
277. Which of the following core cannot be classified by the nature of core material employed?
A. Dry sand core
B. Shell core
C. Sodium silicate core
D. Oil bonded core
Answer:A
278. Which of the following will not be classified under the type of core hardening process employed?
A. Nishiyama process
B. Ram up core
C. Furan no-bake system
D. Cold set process
Answer:B
279. Which of the following core cannot be classified under the shape and position of the core?
A. Balanced core
B. Ram up core
C. Shell core
D. Horizontal core
Answer:D
280. In dielectric core baker, several metallic plates are used for supporting the cores in the system.
A. True
B. False
Answer:B
281. Dielectric core bakers are faster in operation and have good control of maintaining the temperature.
A. True
B. False
Answer:A
282. For small cores mass production, dielectric core bakers can be preferred over continuous type ovens used for baking cores.
A. True
B. False
Answer:B
283. After baking of cores in dielectric core bakers, they can be directly used in the moulding box.
A. True
B. False
Answer:B
284. Core finishing also includes a coating of refractory materials on cores to protect them.
A. True
B. False
Answer:A
285. It is not possible to bake dry sand cores by dielectric core bakers.
A. True
B. False
View Answer
Answer:B
286. How much percentage of water or moisture is contained by green sand cores?
A. 5%
B. 10%
C. 20%
D. 40%
Answer:A
287. In dielectric core baker system, a metal used generally requires a low value of K (dielectric constant of material)
A. True
B. False
Answer:B
288. The process of making green sand cores generally consumes much time as compared to that of dry sand cores.
A. True
B. False
Answer:B
289. In dielectric baker systems, cement plates are normally used for supporting the cores.
A. True
B. False
Answer:A
290. Which force is experienced by cores in the mold?
A. Shear force
B. Magnetic force
C. Buoyant force
D. Electric field force
Answer:D
291. How many core prints are required to locate a core?
A. One
B. Two
C. Three
D. Four
Answer:D
292. What is positioned between mold and core surface?
A. Chaplets
B. Molding surface
C. Core seat
D. Mold cavity
Answer:A
293. When does chaplet become a part of casting?
A. After molding sand is poured
B. After molding cavity is introduced
C. After molten metal is poured
D. After core prints provide the pattern
Answer:D
294. Big cores are set in molds by hand.
A. True
B. False
Answer:B
295. Core wires and rods can be used for removing the core mass from the casting part.
A. True
B. False
Answer:B
296. Core prints are generally provided on the mould for easy removal of cores from the moulding box.
A. True
B. False
Answer:B
297. It is not necessary for the chaplets to be of the same material as the material being casted in the mould.
A. True
B. False
Answer:B
298. Optimized design of chaplets is very necessary for the application of chaplets in supporting the cores.
A. True
B. False
Answer:A
299. For the removal of cores from the moulding box, caustic bath can be used which is very fast in processing the large and complex cores.
A. True
B. False
Answer:B
300. For removing cores from the castings, the hydraulic cleaning method is much safer than the method of caustic bath.
A. True
B. False
Answer:A
301. Cores are generally made of relatively low strength for better utilization in the production of castings.
A. True
B. False
Answer:A
302. Dry sand cores are widely used in the injection moulding process for casting various polymers.
A. True
B. False
Answer:B
303. Green sand cores are not suitable for producing very complex shapes of castings.
A. True
B. False
Answer:A
304. A skin dried mold is dried up to what depth?
A. 4mm – 12mm
B. 5mm – 19mm
C. 6mm – 25mm
D. 7mm – 23mm
Answer:D
305. In cement bonded sand mold, sand mold material consists of what percentage of silica sand?
A. 75.5%
B. 80.5%
C. 85.5%
D. 90.5%
Answer:D
306. In cement bonded sand mold, sand mold material consists of what percentage of Portland cement?
A. 10%
B. 15%
C. 20%
D. 25%
Answer:A
307. A skin dried mold has to be poured immediately after drying.
A. True
B. False
Answer:A
308. In cement bonded sand mold, sand mold material consists of what percentage of water?
A. 3.5%
B. 4.5%
C. 5.5%
D. 6.5%
Answer:B
309. For how long is the mold in cement bonded sand mold, allowed to set?
A. 24 hours
B. 48 hours
C. 72 hours
D. 96 hours
Answer:D
400. Green sand mold contains high strength.
A. True
B. False
Answer:B
401. Which of the following is not counted as mold characteristics?
A. Possession of strength
B. Possession of refractoriness
C. Resist corrosion
D. Resist metal penetration in molds
Answer:D
402. Which of the following sand mold contains free water?
A. Green sand mold
B. Dry sand mold
C. Core sand mold
D. Shell mold
Answer:A
403. Green sand is heated to what temperature to convert it into dry sand?
A. 150°F – 300°F
B. 200°F – 450°F
C. 250°F – 550°F
D. 300°F – 650°F
Answer:D
404. Which of the following statement is true?
A. It is possible to pour only ferrous metals for casting in Nobake process
B. It is possible to pour only non-ferrous metals for casting in Nobake process
C. Both ferrous as well as non ferrous metals can be used for casting through Nobake process
D. Neither ferrous, nor non-ferrous metals are used for casting in nobake process
Answer:D
405. The degree or intensity of ramming _________
A. Increases bulk density
B. Decreases bulk density
C. Does not change bulk density
D. Can increase as well as decrease bulk density
Answer:A
406. Permeability of green sand ________
A. Increases with ramming
B. Decreases with ramming
C. Can increase and decrease as well with the amount of ramming
D. Does not alter with ramming
View Answer
Answer:B
407. Natural moulding sand have which of the following quality(/ies) __________
A. Freely available in abundance
B. Contains clay in a large amount
C. Moisture content range is wider
D. All of the mentioned
Answer:D
408. R.P.M stands for which of the following moulding process?
A. Rotor Plastic Moulding
B. Raisin Pit Moulding
C. Rubber Plaster Moulding
D. Rough Print Moulding
Answer:D
409. RPM is only used for castings of which of the following material?
A. Ferrous metals
B. Non-ferrous Metals
C. Plastics
D. Silicone
Answer:B
410. What is the range of temperature used for baking molds using plaster moulding process?
A. 50°-100°
B. 80°-120°
C. 120°-260°
D. 250°-300°
Answer:D
411. The baking process in plaster moulding process induces which of the following defects?
A. It depletes down the content of water at a very scarce level
B. It develops microscopic cracks onto the surface of mould
C. It gives the surface improper heat that causes differential heat treatment while casting solidification
D. The Calcium reacts at elevated temperatures used for baking the mould
Answer:B
412. The dried plaster mould have __________
A. Low permeability
B. High permeability
C. Moderate permeability
D. Same amount of permeability as other moulds
Answer:A
413. Pit moulding is used for _________
A. Low weighting castings
B. Moderate weighting castings
C. Heavy weighting castings
D. Making castings that requires less time to process
Answer:D
414. Which of the following is a principle binder used in carbon dioxide moulding?
A. Carbon
B. Carbon Dioxide
C. Sodium
D. Sodium silicate
Answer:D
415. Which of the following compound forms the bond between sand particles in carbon dioxide moulding process.
A. Sodium
B. Amorphous silica
C. Dehydrated water
D. Carbon Monoxide
Answer:B
416. Which of the following is the principal material used for Nobake moulding process?
A. Furan or Urethane
B. Wood saw
C. Clay-bentonite
D. Water only
Answer:A
417. In Nobake moulding process, the chemical process of hardening of binder starts when ___________
A. The sand is poured into the mixture
B. The sand is taken out of the mixture
C. The mixture is poured into the moulding flask
D. When the molten metal is poured into the cavity
Answer:B
418. The Nobake mould have a higher strength as compared to other moulds due to _________
A. Its higher moisture content
B. Its lower moisture content
C. The property to withstand higher metallostatic pressures during casting
D. The property to adapt to any volume
Answer:D
Explanation: The Nobake moulding process provides a good strength of mould, hence, it can withstand the metallostatic pressures and can give good dimensional tolerances.
419. What is the disadvantage of hand molding?
A. Damage to the projections
B. Costly method
C. Non-uniform strength
D. Poor surface finish of the mold
Answer:D
420. Which is not a machine molding process?
A. Jolting
B. Squeezing
C. Sand slinging
D. Hand molding
Answer:D
421. Which machine molding process will give uniform strength throughout the mold?
A. Sand slinging
B. Squeezing
C. Jolt and squeezing
D. Jolting
Answer:A
422. In which of the following molding process strength at the top of the mold is higher?
A. Hand molding
B. Squeezing
C. Jolting
D. Jolt and Squeezing
Answer:B
423. In which of the following molding process strength at top of the mold is less?
A. Hand molding
B. Squeezing
C. Jolting
D. Jolt and Squeezing
Answer:D
424. Which of the following molding methods is the most costly?
A. Sand slinging
B. Jolt and squeezing
C. Jolting
D. Hand molding
Answer:A
425. Which of the following molding methods have the least production rate?
A. Squeezing
B. Jolt and squeezing
C. Jolting
D. Hand molding
Answer:D
426. Which of the following molding methods have the highest production rate?
A. Squeezing
B. Jolt and squeezing
C. Jolting
D. Sand slinging
Answer:D
427. Jolt and squeezing can be used for achieving uniform strength if the height of the mold is up to 200 mm.
A. True
B. False
Answer:A
428. In the sand slinging process we can’t use a pattern with extension or projection.
A. True
B. False
Answer:A
429. Which of the following methods of ramming is suitable for the small batch production of castings?
A. Hand moulding
B. Squeezing
C. Jolting
D. Sand slinging
Answer:A
430. Which of the following parts is used in jolt moulding to ram the sand in mould?
A. Biscuit
B. Jolt
C. Roller
D. Overhead hopper
Answer:D
431. Jolt method of ramming makes smooth ramming and packing of sand layers in the mould.
A. True
B. False
Answer:B
432. The jolt method of ramming can be suitable for horizontal surfaces in the mould.
A. True
B. False
Answer:A
433. The method of jolt ramming operates very leniently with the moulding equipment.
A. True
B. False
Answer:B
434. The problem with moulding equipment in jolt moulding can be avoided by implementing a squeeze method of ramming.
A. True
B. False
Answer:A
435. In squeeze ramming, hardness achieved is inversely proportional to the pressure applied on the squeeze plate.
A. True
B. False
Answer:B
436. In squeeze ramming, plate is always provided with a contour to achieve a better hardness of the sand.
A. True
B. False
Answer:A
437. Squeeze ramming is best for big castings and mainly suitable for high depth flasks.
A. True
B. False
Answer:B
438. Which of the following is the best method for the uniform ramming of moulding sand?
A. Jolting
B. Squeezing
C. Sand slinging
D. Hand moulding
Answer:D
439. Sand slinging method is best, but the process takes too much time to accomplish the operation.
A. True
B. False
Answer:B
440. In sand slinging, which of the following parts is used for the spraying of moulding sand into the flask?
A. Biscuit
B. Runner
C. Diffuser
D. Nozzle
Answer:D
441. Which of the following is the simplest sand molding?
A. Open sand method molding
B. Bedded-in method molding
C. Turn-over method molding
D. Dry sand molding
Answer:A
442. Which of the following is not an application of Open sand molding method?
A. Grills
B. Floor plates
C. Weights
D. Cupboards
Answer:D
443. Which method is used if the upper surface of casting is required to be smooth?
A. Open sand method molding
B. Bedded-in method molding
C. Turn-over method molding
D. Dry sand molding
Answer:B
444. How much is the floor sand in a typical dry sand molding mixture?
A. 30%
B. 35%
C. 40%
D. 45%
Answer:D
445. Which of the following imparts a better dimensional accuracy?
A. Open sand method molding
B. Bedded-in method molding
C. Turn-over method molding
D. Dry sand molding
Answer:D
446. Dry sand molding is cheaper as compared to green sand molding.
A. True
B. False
Answer:B
447. In bedded-in method, what shape does the upper surface of the casting have?
A. Round
B. Helical
C. Flat
D. Trapezoidal
Answer:D
448. Railing and gates is an application of which of the following molding method?
A. Open sand method molding
B. Bedded-in method molding
C. Turn-over method molding
D. Dry sand molding
Answer:A
449. Which of the following method can be used for both solid patterns and split patterns?
A. Open sand method molding
B. Bedded-in method molding
C. Turn-over method molding
D. Dry sand molding
Answer:D
450. Which of the following is not a hand molding process?
A. Air cooling
B. Ramming
C. Placing
D. Turning over
Answer:A
451. How apart should gaggers be located?
A. 65mm
B. 70mm
C. 75mm
D. 80mm
Answer:D
452. At what distance should the gagger be kept from the pattern?
A. 3mm
B. 6mm
C. 9mm
D. 12mm
Answer:B
453. Hand rammer is made up of metal.
A. True
B. False
Answer:A
454. Which of the following processes is the first step involved in the sand casting?
A. Clamping
B. Cooling
C. Mould making
D. Pouring
Answer:D
455. It is possible to provide any kind of internal features to the casting by the help of pattern.
A. True
B. False
Answer:B
456. In mould making process, moulding time is greatly affected by the shape and size of the casting components.
A. True
B. False
Answer:A
457. In mould making process, clamping is basically done to prevent any loss of material from the moulding box.
A. True
B. False
Answer:A
458. It is not possible to estimate solidification time by considering the wall thickness and temperature of the casting metal.
A. True
B. False
Answer:B
459. During the pouring process, filling time of molten metal should be short to avoid early solidification of the casting.
A. True
B. False
Answer:A
460. The process shakeout is generally referred to escaping of gases from the molten casting during the solidification.
A. True
B. False
Answer:B
461. Quick solidification of the casting can cause defects like shrinkages, cracks or blow holes.
A. True
B. False
Answer:A
462. Shot blasting operation is mainly done to identify the type of defects in the casting part.
A. True
B. False
Answer:B
463. A trimming press is a machine tool which is widely used for removing the excess material from the casting part.
A. True
B. False
Answer:A
464. Venting is a process which allows molten metal to compensate for its liquid and solidification shrinkage.
A. True
B. False
Answer:B
465. Which of the following effects is the effect caused by the ignition of oxygen due to high pressure and temperature of melt?
A. Otto effect
B. Dual effect
C. Diesel effect
D. Rankine effect
Answer:D
466. Improper venting during moulding process causes a diesel effect which further results in stress crack defects in the casting.
A. True
B. False
Answer:A
467. For proper venting, the pouring time is increased which allow easy escape out of gases from the mould without inducing any defects.
A. True
B. False
Answer:B
468. High viscosity of molten metal can help in removing of gases but will cause defects in the casting.
A. True
B. False
Answer:A
469. Porous sintered materials can be inserted into the mould cavity to act as a vent.
A. True
B. False
Answer:A
470. Vacuum technology for venting process is very economical and widely used in the casting process.
A. True
B. False
Answer:B
471. In the injection moulding process, an overflow system is used for the venting process.
A. True
B. False
Answer:A
472. For the venting process, the casting yield is generally high with the overflow system in the mould.
A. True
B. False
Answer:B
473. In the injection moulding process, venting at the runner side can reduce the air pressure.
A. True
B. False
Answer:A
474. Cores generally experience a single force called gravitational force in the mould.
A. True
B. False
Answer:B
475. In the mould, the heat experienced by the core is much severe than that of experienced by the mould wall.
A. True
B. False
Answer:A
476. The buoyancy force is generated only due to the weight of the core inside the mould.
A. True
B. False
Answer:B
477. Refractoriness required in the core should be lower than that required in the moulding sand.
A. True
B. False
Answer:B
478. Coarse sand grains of the core material can improve the refractoriness of the core.
A. True
B. False
Answer:A
479. Collapsibility of the core material is not considered in the core making process.
A. True
B. False
Answer:B
480. Friability and crumbling are the properties which help in removing the core material from the solidified casting.
A. True
B. False
Answer:A
481. Green sand core is normally used for producing shallow features in the casting components.
A. True
B. False
Answer:A
482. Increase in content of the binders in the core sand always increases the porosity of the core material.
A. True
B. False
Answer:B
483. Centrifugal casting is a method of casting which works on the principle of centrifugal force.
A. True
B. False
Answer:A
484. With what does iron react to give out Ferrous Oxide?
A. Carbon dioxide
B. Nitrogen
C. Ozone
D. Oxygen
Answer:D
485. What is the chemical formula of fayalite?
A. FeO2SiO2
B. FeOSiO2
C. FeO3SiO2
D. FeO2SiO3
Answer:B
486. What is the chemical formula of silica?
A. SiO
B. SiO2
C. SiO3
D. SiO4
Answer:B
487. Silica reacts with what to give out fayalite?
A. Iron
B. Iron Sulphate
C. Iron Oxide
D. Iron Carbide
Answer:D
488. What percent of magnesium is used in mold metal reactions?
A. More than 1%
B. More than 2%
C. More than 3%
D. More than 4%
Answer:A
489. Which metal in aluminium alloy reacts with water to give out hydrogen filled pinholes?
A. Manganese
B. Iron
C. Magnesium
D. Aluminium
Answer:D
490. What is the condition for mold metal reaction to take place?
A. Radiating contact between gas and metal
B. Direct contact between gas and metal
C. Radiating contact between gas and oxide film
D. Direct contact between gas and oxide film
Answer:B
491. How can the pinholes be reduced?
A. Oxidizing
B. Deoxidizing
C. Adding ozone
D. Adding calcium carbonate
Answer:B
492. What is differential freezing?
A. Increase in oxygen concentration
B. Increase in nitrogen concentration
C. Increase in carbon concentration
D. Increase in hydrogen concentration
Answer:D
493. In light alloys, metal – mold reaction can be suppressed by adding Helium.
A. True
B. False
Answer:B
494. In a green sand moulding process, uniform ramming leads to _____
A. uniform flow of molten into the mould cavity
B. less chance of gas porosity
C. less sane expansion type of casting defect
D. greater dimensional stability of the casting
Answer:D
495. In green sand mould, what is the indication of the word green?
A. It shows polymeric mould has been cured
B. Mould is green in color
C. Mould contains moisture
D. Mould has been totally dried
Answer:D
496. Which of the following is not a property of a sand mould?
A. Fluidity
B. Strength
C. Collapsibility
D. Permeability
Answer:A
497. Hardness of green sand mould can be increase by _____
A. increase in permeability
B. decrease in permeability
C. increase in moisture content beyond 6 percent
D. increase in both moisture content and permeability
Answer:B
498. What is the advantage of having a low bulk density of a sand-mix?
A. Higher strength
B. Good refractoriness
C. Higher flow ability
D. Higher permeability
Answer:D
499. Which of the following sands has the highest thermal conductivity?
A. Silica sand
B. Zircon sand
C. Chromite sand
D. Olivine sand
Answer:B
500. Bentonite is commonly used as bonding material for dry sand cores.
A. True
B. False
Answer:A
501`. Which test is performed for the study of grain size distribution of moulding sand?
A. Screening test
B. Whirl test
C. Crushing test
D. Shearing test
Answer:A
502. Which of the following reasons stand for the crumbling of green sand mould?
A. The sand grains are not adequately bonded
B. Excess of water and clay mixture
C. Due to the presence of impurities in the green sand mould
D. Fine grain size
Answer:A
503. Refractoriness of the green sand mould shows _____
A. High strength
B. Toughness
C. High temperature resistant
D. High porosity
Answer:D
504. When would dross and slag tend to float on the metal surface?
A. When pouring basins are doubled
B. When pouring basins are made large
C. When pouring basins are made small
D. When pouring basins are removed
Answer:B
505. Which of the following helps connecting runner and the mold cavity?
A. Sprue
B. Riser
C. Gate
D. Pouring cup
Answer:D
506. Which of the following is not a type of a gate?
A. Top gate
B. Bottom gate
C. Parting gate
D. Middle gate
Answer:D
507. Which of the following gate is also called as ‘drop gate’?
A. Top gate
B. Bottom gate
C. Parting gate
D. Middle gate
Answer:A
508. Which of the following gates is used for making stove plate castings?
A. Edge gate
B. Wedge gate
C. Ring gate
D. Finger gate
Answer:B
509. Which of the following gates is not favourble for non ferrous castings?
A. Top gate
B. Bottom gate
C. Parting gate
D. Middle gate
Answer:A
510. Ring gates retain slag.
A. True
B. False
Answer:A
511. For the functioning of the gating system, which of the following factors need not be controlled?
A. Type of sprue
B. Size of runner
C. Temperature of molten metal
D. Type of riser
Answer:D
512. Sprues up to what diameters are round in section?
A. 10mm
B. 20mm
C. 30mm
D. 40mm
Answer:B
513. What prevents the liquid metal from entering the gate?
A. Gate basin
B. Sprue
C. Runner
D. Riser
Answer:A
514. Which of the followings is the formula for calculating the choke area (A.?
A. 2W/dtC√2gh
B. W/dtC√2gh
C. W²/dtC√2gh
D. 2W³/dtC√2gh
Answer:B
515. Which of the following methods is used for trapping the slag from entering steel casting into the mould?
A. Finn’s method
B. Down gate method
C. Whirl gate method
D. Euler’s method
Answer:D
516. Which of the following materials require a longer pouring time?
A. Non-ferrous material
B. Grey cast iron
C. Ferrous alloys
D. Brass
Answer:A
517. Which of the following is the purpose of runner extension?
A. To make smooth surface finish
B. To make the casting of specific size and shape
C. To remove slag and dross from the metal
D. To make fast cooling of molten metal
Answer:D
518. Which of the following gating systems is useful for casting drossy alloys?
A. Pressurized gating system
B. Partially pressurized gating system
C. High pressurized gating system
D. Non-pressurized gating system
Answer:D
519. Casting yield of a non-pressurized gating system is _____
A. very high
B. 80%
C. very less
D. 50%
Answer:D
520. Smallest in-gate area in the pressurized gating system causes_____
A. turbulency
B. low velocity
C. low viscosity
D. smooth running of molten metal
Answer:A
521. What is the ratio of width to the depth of in-gates in general?
A. 1:2
B. 1:1
C. 4:1
D. 2:7
Answer:D
522. Why large or complex castings require multiple in-gates?
A. To make smooth surface finish of the casting
B. To make uniform flow
C. To have high strength of the casting
D. To have good toughness of the casting
Answer:B
523. The liquid metal that runs through the channels without friction in the mould obeys which of the following theorem?
A. Bernoulli’s theorem
B. Clausius theorem
C. Helmholtz’s theorem
D. Carnot’s theorem
Answer:A
524. Which of the following flows is responsible for too less pouring time of molten metal in the mould?
A. Laminar flow
B. Viscous flow
C. Turbulent flow
D. Irrotational flow
Answer:D
525. What will be the optimum pouring time for cast iron whose mass is 100 kg and a thickness of 25 mm? Fluidity of iron is 32 inches?
A. 24.98
B. 18.2
C. 31.32
D. 14.8
Answer:A
526. Up to what percent is the efficiency increased by using exothermic materials?
A. 65%
B. 70%
C. 755
D. 80%
Answer:B
527. Heat diffusivity does not depend on which of the following?
A. Thermal conductivity
B. Specific heat
C. Latent heat
D. Density of the material.
Answer:D
528. How high can solidification rate factor be increased by metal chills?
A. 12
B. 13
C. 14
D. 15
Answer:D
529. Chills promote only directional solidification.
A. True
B. False
Answer:B
530. With an increase in the volume of castings, how would it affect the freezing time?
A. Increase
B. Decrease
C. Will not change
D. No relation
Answer:A
531. Which of the following materials are not used for making chills?
A. Steel
B. Cast iron
C. Copper
D. Zinc
Answer:D
532. External chills can be used again and again.
A. True
B. False
Answer:A
533. Exothermic material does not contain which of the following metal oxide?
A. Cobalt
B. Copper
C. Iron
D. Magnesium
Answer:D
534. Iron oxide reacts with which metal to give aluminium oxide?
A. Iron
B. Aluminium
C. Copper
D. Zinc
Answer:B
535. How many moles of iron oxide are needed to react with 8 moles of aluminium to form 4 moles of aluminium oxide?
A. 2
B. 8
C. 4
D. 6
Answer:D
536. With an increase in the initial volume, how does it affect the efficiency of the riser?
A. Increases
B. Decreases
C. Will not change
D. No relation
Answer:B
537. In solidification of a riser, which of the following cannot be used for insulation?
A. Insulation powder
B. Insulation sleeve
C. Insulation pad
D. Insulation clip
Answer:D
538. Which of the following insulations slows down the radiation losses?
A. Insulation powder
B. Insulation sleeve
C. Insulation pad
D. Insulation clip
Answer:A
539. Which of the following will not affect insulation?
A. Charcoal
B. Graphite
C. Copper
D. Out hulls
Answer:D
540. An open riser is connected only at the top of the cope.
A. True
B. False
Answer:B
541. With an increase in the weight of sprue, what would be the corresponding change in the yield?
A. Increase
B. Decrease
C. Will not change
D. Not related
Answer:B
542. A blind riser is bigger than an open riser.
A. True
B. False
Answer:B
543. What is the general shape of an open riser?
A. Cubical
B. Trapezoidal
C. Cylindrical
D. Rounded
Answer:D
544. With an increase in the weight of riser, what would be the corresponding change in the yield?
A. Increase
B. Decrease
C. Will not change
D. Not related
Answer:B
545. Which of the following factors is not considered in regards with directional solidification?
A. Riser diameter
B. Riser height
C. Riser location
D. Metal to be casted
Answer:D
546. Modulus method can be used for determining the dimensions of the riser.
A. True
B. False
Answer:A
547. If feeding distance is more, the number of risers required will be more.
A. True
B. False
Answer:B
548. How can we enhance the feeding distance during casting?
A. Reducing molten metal temperature
B. Increase fluidity
C. By using low thermal conductivity mold
D. Using sand mold
Answer:B
549. When do we need more number of risers during casting?
A. Feeding distance is low
B. Feeding distance is high
C. Thermal conductivity of mold is high
D. Fluidity of molten metal is high
Answer:A
550. How can we calculate the solidification time?
A. Shrinkage volume consideration method
B. Modulus method
C. Novel research method
D. Chvorinov’s rule
Answer:D
551. Which of the following is a key parameter when we design a riser using Novel research method?
A. Modulus
B. Freezing ratio
C. Shape factor
D. Shrinkage volume
Answer:D
552. How can we eliminate the shrinkage cavity?
A. By increasing riser height
B. By reducing riser height
C. Reducing the number of risers
D. By using an open riser
Answer:A
553. Which of the following can be used for increasing feeding distance?
A. Uniform temperature gradient
B. Negative temperature gradient towards the riser
C. No temperature gradient
D. Positive temperature gradient towards the riser
Answer:D
554. What will be the feeding distance (in inches) without using chill for a plate of thickness T?
A. 4.5√T + 2
B. 4.5√T
C. 6√T+2
D. 6√T
Answer:B
555. Improper risering has always resulted in the formation of voids inside the castings.
A. True
B. False
Answer:A
556. The cooling characteristics of casting can be represented by the_____
A. volume to surface area ratio
B. product of volume and surface area
C. surface area to volume ratio
D. surface area to perimeter ratio
Answer:D
557. Which of the following relations is given by chvorinov for the solidification time of a casting?
A. ts = k(V/SA.2
B. ts = k(V/SA.
C. ts = k(V*SA.2
D. ts = k(V/SA.3
Answer:A
558. A sphere can be used as a riser because of its freezing ratio, which is greater than unity.
A. True
B. False
Answer:B
559. Which of the following methods is used for the determination of optimum riser size?
A. RMS method
B. Modulus method
C. Finn method
D. Ring method
Answer:B
560. Which of the following factors is used to define the casting type in riser design?
A. Plating factor
B. Ranginess factor
C. Caine factor
D. Pseudo factor
Answer:B
561. The core material should be highly refractory in nature to avoid any damages to it.
A. True
B. False
Answer:A
562. In casting system, the riser is located at the lightest section to avoid any disturbance.
A. True
B. False
Answer:B
563. Which of the following parts is used as exothermic materials or insulators for the increase in efficiency of the riser?
A. Chills
B. Feeding aids
C. Biscuit
D. Filler
Answer:B
564. The main function of a riser is to maintain the escaping of gases from the casting during solidification.
A. True
B. False
Answer:B
565. Which of the following materials can have the negative volumetric shrinkage of the casting?
A. Aluminium
B. Steel
C. Zinc
D. Grey cast iron
Answer:D
Explanation: Different materials have different volumetric shrinkage, in which grey cast iron is the material which sometimes may have a negative shrinkage. This mainly occurs because of high carbon and silicon contents in the grey cast iron, which results in occurring of graphitization which increases the volume.
566. There is no requirement of any risers for the casting of grey cast iron.
A. True
B. False
Answer:A
567. Which of the following materials has superior strength and rigidity at high elevated temperature?
A. Aluminium-based alloys
B. Copper-based alloys
C. Zinc-based alloys
D. Nickel-based alloys
Answer:D
568. Directional solidification allows components to be produced from the melt in a single stage process.
A. True
B. False
Answer:A
569. It is not easy to control the material at the microstructure level in the directional solidification.
A. True
B. False
Answer:B
570. It is not possible to replace super-alloys by the directionally solidified high temperature eutectics.
A. True
B. False
Answer:B
571. Oxidation resistance should be the prime requirement for the high temperature structural applications.
A. True
B. False
Answer:A
572. To achieve useful strength of the material at temperatures of 1000-1600 ⁰C, what should be the melting point temperature of the material?
A. 1000 ⁰C
B. 1300 ⁰C
C. 1600 ⁰C
D. More than 1600 ⁰C
Answer:D
573. Which of the following shows the relationship between the growth rate and inter-phase spacing?
A. λ2R = constant
B. λR2 = constant
C. λ/R = constant
D. λ⁴R = constant
Answer:A
574. Which of the following furnaces is used for the directional solidification of cast ingots of eutectic?
A. Pneumatic zone furnace
B. Cupola furnace
C. Hydraulic zone furnace
D. Optical floating zone furnace
Answer:D
575. Which of the following methods is used for the cutting of directionally solidified rods or castings?
A. Thermal cutting
B. Electro-discharge machining
C. Water jet cutting
D. Weld cutting
Answer:B
576. In the process of directional solidification, weight always remains constant for all the materials.
A. True
B. False
Answer:B
577. Directional solidification always ends at the sprue part and starts from the end of the casting.
A. True
B. False
Answer:A
578. Progressive solidification is better than the directional solidification and it is independent to the geometry of mould.
A. True
B. False
Answer:B
579. What is the purpose of strainer in the gating system?
A. To make uniform flow
B. To make smooth surface finish of the casting
C. To remove dross from the molten metal
D. To create positive pressure throughout to avoid aspiration effect
Answer:D
580. Which of the following gases is responsible for the Pin hole porosity in the molten metal?
A. Hydrogen
B. Nitrogen
C. Oxygen
D. Carbon-dioxide
Answer:A
581. Which of the following can be the reason for the aspiration effect?
A. High pressure of molten metal
B. High pouring temperature of molten metal
C. Low viscosity of molten metal
D. High viscosity of molten metal
Answer:B
582. Which of the following reasons is the incorrect reason for the blow holes inside the castings?
A. Presence of moisture in the mould
B. Lower venting
C. Lower permeability of the mould
D. High pressure of the molten metal
Answer:D
583. Sprue design is made tapered instead of straight ___________
A. To easy flow of molten metal
B. To have smoothness in the metal flow
C. To maintain the pressure balance
D. To avoid the erosion of mould sand
Answer:D
584. Splash core is used _____
A. to reduce the eroding force of the liquid metal
B. to make the flow smooth and slow
C. to remove dross from the molten metal
D. to prevent heavier impurities from entering the mould
Answer:A
584. The primary purpose of sprue in casting mould is to _____
A. act as a reservoir for molten metal
B. feed the casting at rate consistent with the rate of solidification
C. feed molten metal from the pouring basin to the gate
D. help feed the casting until all solidification takes place
Answer:D
585. Which of the following effects can produce porous castings?
A. Aspiration effect
B. Viscous effect
C. Shapiro effect
D. Turbulent effect
Answer:A
586. Which of the following ways can use for stopping the rapid solidification of the molten metal in the mould?
A. By having the mould of high permeability
B. By making a uniform flow of molten metal
C. By creating high pressure on the molten metal
D. By using too much superheat
Answer:D
587. Which of the following gating designs is used to avoid the splashing of the molten metal in the mould?
A. Vertical gating
B. Horizontal gating
C. Inclined gating
D. Bottom gating
Answer:D
588. The energy loss due to friction (Ef) in a circular conduit (on the basis of per unit mass) is given by_____
A. Ef = 4fLv̅²/2D
B. Ef = 8fLv̅²/2D
C. Ef = 4fLv̅³/2D
D. Ef = 4fLv̅²/D
Answer:A
589. Which of the following reasons is the incorrect reason for frictional losses in the conduit?
A. Gradual change in flow direction
B. Sudden contraction of the flow cross-sections
C. Sudden enlargement of the flow cross-sections
D. Due to irrotational flow of molten metal
Answer:D
590. Why is Velocity of a fluid in contact with any solid surface is zero?
A. Due to cohesive forces in the fluid particles
B. Due to low velocity of fluid
C. Due to no slip condition
D. Due to high intermolecular forces between the fluid particles
Answer:D
591. Which of the following terms is modified in the integrated energy balance equation for non-uniform velocity distribution?
A. Potential energy
B. Kinetic energy
C. Pressure energy
D. Thermal energy
Answer:B
592. The velocity distribution within the conduit depends on _____
A. shape of the conduit and nature of flow
B. temperature of the molten metal
C. impurities present in the molten metal
D. type of the molten metal
Answer:A
593. For a smooth conduit, which of the following is the value of friction factor (f) for laminar and turbulent flow respectively?
A. 10/Re, 0.0791(Re)-0.25
B. 16/Re, 0.0791(Re)-0.25
C. 10/Re, 0.0771(Re)-0.25
D. 16/Re, 0.0171(Re)-0.25
Answer:B
594. Friction loss factor (eғ) in the conduit of liquid metal depends on _____
A. temperature of the molten metal
B. presence of dross in the molten metal
C. ratio of the flow area and Reynolds no. of the flow
D. whirling of the molten metal
Answer:D
595. For melting of cast iron, which of the following furnace is used?
A. Rotary furnace
B. Cupola furnace
C. Pit furnace
D. Electric furnace
Answer:B
596. Why is sand bed prepared for melting of metal in Cupola furnace?
A. It provides a refractory bottom
B. It soaks the moisture from the metal
C. It conducts the heat faster and uniformly
D. None of the mentioned
Answer:A
597. What is the function of slag hole in a cupola furnace?
A. To tap the slag generated
B. To generate the slag
C. To allow outflow of gases
D. All of the mentioned
Answer:A
598. Incoming air pressure and quantity in cupola furnace are controlled by which of the following element?
A. Tuyeres
B. Tapping spout
C. Wind box
D. Blast pipe
Answer:D
599. Which of the following chemical compound, is the most common flux added to the charge in a cupola furnace?
A. Coke
B. Methane
C. Carbon dioxide
D. Limestone
Answer:D
600. Which of the following metal has a melting point of about 1537oC and latent heat of fusion 65.0 cal/g?
A. Nickel
B. Copper
C. Zinc
D. Iron
Answer:D
601. Electric arc furnaces are most suitable for which of the following type of material?
A. Ferrous
B. Non-Ferrous
C. Both ferrous and nonferrous
D. Neither ferrous nor nonferrous
Answer:A
602. There is no direct contact of flame and metal in which of the following type of furnace?
A. Cupola
B. Crucible
C. Electric arc
D. Induction
Answer:B
603. What is hearth in a furnace?
A. The electrodes are often called hearth
B. The walls of the furnace
C. The bowl shaped bottom of the furnace
D. The dome shaped roof of the furnace
Answer:D
604. Why are flux added to the charge ( parent metal to be melteD. during melting of a metal?
A. To increase carbon content
B. To increase refractoriness
C. To add specific oxides
D. To remove specific oxides
Answer:D
605. In an induction furnace, mixing and melting rates are altered by?
A. Controlling the temperature ranges only
B. Controlling the number of electrodes used only
C. Controlling power and frequency of current only
D. All of the mentioned factors
Answer:D
606. Which of the following is/are the advantage(s) of an Induction Furnace?
A. Higher yield
B. Cleaner melting
C. Compact Installation
D. All of the mentioned
Answer:D
607. Which of the following metal has a melting point of about 420oC and latent heat of fusion 26.3 cal/g?
A. Nickel
B. Copper
C. Zinc
D. Iron
Answer:D
608. Which of the following metal has a melting point of about 660oC and latent heat of fusion 92.7 cal/g?
A. Aluminium
B. Lead
C. Magnesium
D. Tin
Answer:A
609. Gas-Fired burner is used in which of the following furnace?
A. Induction Furnace
B. Reverberatory Furnace
C. Cupola Furnace
D. Crucible Furnace
Answer:B
610. What is inoculation of cast iron?
A. Addition of sulphur alloys
B. Addition of silicon alloys
C. Addition of oxides
D. Addition of parent metal’s ore
Answer:B
611. Why is inoculation done certain times during melting of cast iron?
A. To enhance its mechanical properties
B. To reduce the liquid shrinkage of metal
C. To enhance the surface finishing
D. All of the mentioned
Answer:A
612. Which of the following is/are not used to melt material in casting(foundry) industries?
A. Cupola furnace
B. Induction furnace
C. Ladle furnace
D. Crucible furnace
Answer:D
Explanation: All of listed are the furnaces used by metal foundry industries to melt down metal for casting purposes, except Ladle furnace.
613. Which of the following formulas show the Sievert’s law of percent of hydrogen (H) present in a melt?
A. H = K(pHA.2
B. H = K*pHa
C. H = K/pHa
D. H = K√pHa
Answer:D
614. Maintaining of hydrogen level to a minimum in a melt is very important because there is no simple dehydrogenating technique.
A. True
B. False
Answer:A
615. Which of the following methods is best for preventing the solutions of gases in metals?
A. Bubbling of gas
B. Vacuum melting
C. Venting arrangement
D. Elements inclusion
Answer:B
616. Improper venting arrangement causes mechanical trapping of gases in metal castings.
A. True
B. False
Answer:A
617. Nitrogen cannot be used for ferrous and nickel based alloys in hydrogen removal technique because_____
A. it leads to form high dross in metal castings
B. it gives rise to porosity in metal castings
C. it affects the grain size
D. it generates blow holes in metal castings
Answer:D
618. In the hydrogen removal process, carbon monoxide for ferrous alloys removes not only hydrogen but also nitrogen.
A. True
B. False
Answer:A
619. Which of the following metals has the lowest liquid solubility (cc/kg) of hydrogen at atmospheric pressure?
A. Iron
B. Copper
C. Magnesium
D. Aluminium
Answer:D
620. Variation in solubility of gases can cause the generation of gases in metal castings.
A. True
B. False
Answer:A
621. Which of the following gases can be beneficial in imparting certain desirable qualities to the castings?
A. Oxygen
B. Nitrogen
C. Hydrogen
D. Carbon monoxide
Answer:B
622. Which of the following metals comes in an exothermic group of metals when the solubility of hydrogen is concerned?
A. Iron
B. Titanium
C. Magnesium
D. Nickel
Answer:B
623. Which of the following equations represent the solubility (S) of the hydrogen in the metals?
A. S = C exp[-Es/(kθ)]
B. S = C exp[-Es*(kθ)]
C. S = C log[-Es/(kθ)]
D. S = C log[-Es*(kθ)]
Answer:A
624. Presence of hydrogen in endothermic metals causes lattice distortion.
A. True
B. False
Answer:B
625. Breaking of the sand mould is done after sufficient cooling of castings, to have_____
A. proper surface finish of castings
B. no any distortion to castings
C. high casting yield
D. less casting yield
Answer:B
626. Pressure change of a melt is responsible for the cooling rate of the castings in the mould.
A. True
B. False
Answer:B
627. Which of the following types of mould will have the longest period of cooling time for the same castings?
A. Green sand mould of simple shape and size
B. Dry sand mould of simple shape and size
C. Dry sand mould of complex shape and size
D. Green sand mould of complex shape and size
Answer:D
628. Faster and uneven cooling of hot casting affects the castings badly or may cause several defects in the castings.
A. True
B. False
Answer:A
629. For ferrous alloys, the breaking of mould should be done at a temperature_____
A. 780 ⁰C
B. 850 ⁰C
C. above 700 ⁰C
D. below 700 ⁰C
Answer:D
630. Which of the following processes is known as fettling?
A. Cleaning of castings
B. Pouring of melt into mould
C. Releasing of gases from the melt
D. Inclusion of slag in the castings
Answer:A
631. Flame or arc cutting method is used for the removal of dry sand cores from the castings.
A. True
B. False
Answer:B
632. Which of the following methods is more convenient for the removal of very large size gates and risers from the steel castings?
A. Hammering
B. Chipping
C. Flame or arc cutting
D. Hack sawing
Answer:D
633. A reduced metal section at the casting joint makes easy removal of gates and risers from the castings.
A. True
B. False
Answer:A
634. Which of the following techniques is used for smoothening of the rough cut gate edges on the castings?
A. Hack sawing
B. Flame cutting
C. Sand blasting
D. Pedestal or swing frame grinding
Answer:D
635. Which of the following methods is best for cleaning of sand particles sticking to the casting surface?
A. Chipping
B. Sand blasting
C. Grinding
D. Hammering
Answer:B
636. Tumbling method, for cleaning of sand and unwanted fins from the castings, can be used for thin castings with fragile or overhung segments.
A. True
B. False
Answer:B
