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
