Special Casting Techniques
Q. Which type of sand is used in shell moulding?
A) Black sand
B) Wet and fine sand
C) Dry and fine sand
D) Any of the sand
Answer:C
Q. Which is the most widely used resin in shell moulding?
A) Phenol formaldehyde
B) Ethanol formaldehyde
C) Phenol
D) Ethanol
.
Answer:A
Q. The machine used to mix shell mould particles consistently is __________
A) Mixer
B) Cupola furnace
C) Mueller
D) Mixer & Cupola furnace
.
Answer:C
Q. Which of the following statement is true?
A) The size of the casting can be adjustable
B) The size of the casting is not limited
C) The size of the casting obtained by shell moulding is limited
D) None of the mentioned
.
Answer:C
Q. Cylinder and cylinder heads for air cooled IC engines are casted using which technique?
A) Precision investment casting
B) Shell moulding
C) Permanent mould casting
D) Die casting
.
Answer:B
Q. In precision investment casting, to make the mould the prepared pattern is dipped into a slurry. From which material is this slurry is made up of?
A) Ethyl silicate
B) Sodium silicate
C) Both Ethyl and Sodium silicate
D) Neither Ethyl nor Sodium silicate
.
Answer:C
Q. Cores used in PMC are usually made up of?
A) Metal
B) Collapsable material
C) Sand
D) All of the mentioned
.
Answer:D
Q. Another name of Gravity Die Casting is?
A) Centrifugal casting
B) Permanent mould casting
C) Precision investment casting
D) Hot chamber process
.
Answer:B
Q. In PIC, any wax remnants are dissolved with the help of hot vapors of a solvent. Which solvent is used for this purpose?
A) Ethanol
B) ChloroFluoroCarbon
C) TriChloroEthylene
D) Any of the above
.
Answer:C
Q. Which of the following is a limitation of die casting, but is overcome in vacuum die casting?
A) The air left in the cavity when the die is closed
B) The moisture left in the cavity when the die is closed
C) The air left in the cavity when the die is open
D) The moisture left in the cavity when the die is open
.
Answer:A
Q. Pattern used in shell moulding is normally made up of?
A) Wax
B) Metal
C) Wood
D) Plastic
.
Answer:B
Q. The casting process that does not require a core to produce a hollow casting is?
A) Shell moulding
B) Hot-chamber die casting
C) Permanent mould casting
D) True centrifugal casting
.
Answer:C
Q. Hollow casting is the other name of which of the following special casting process?
A) Slush casting
B) Vacuum die casting
C) Precision investment casting
D) Squeeze casting
.
Answer:A
Q. Squeeze casting method was developed in which country?
A) Japan
B) India
C) America
D) Russia
.
Answer:D
Q. The tundish is a _______
A) Pouring vessel
B) Riser
C) Type of core
D) Machine name
.
Answer:A
Q. Which of the type of centrifugal casting methods is used to produce ‘non-symmetrical’ shaped castings?
A) True centrifugal casting
B) Semi centrifugal casting
C) Centrifuging
D) Non centrifugal casting
.
Answer:C
Q. True centrifugal casting method is usually used to make __________
A) Bent pipes
B) Hollow pipes
C) Bolts
D) Nuts
.
Answer:B
Q. Pressure range for low pressure die casting is ___________
A) 0.3-1.5 bars
B) 0.5-2 bars
C) 2-6 bars
D) up to 8 bars
.
Answer:A
Q. Which of the following synthetic resins are used for mixing with sand in shell moulding?
A) Thermosetting resins
B) Epoxy resins
C) Fiber glass resins
D) Kevlar
.
Answer:A
Q. Grain size of the sand particles has no affects on the surface finish of the casting.
A) True
B) False
.
Answer:B
Q. In shell moulding sand preparation, the resin is combined with a catalyst (hexA) to develop the_____
A) thermoplastic characteristics
B) toughness of the resin
C) thermosetting characteristics
D) viscosity of the resin
.
Answer:C
Q. Which of the following compositions of the shell sand is used for avoiding of thermal crack during pouring?
A) Silica sand
B) Zircon sand
C) Resin
D) Additives
.
Answer:D
Q. Which of the following lubricants is added to the resin sand mixture for better flowability of the sand?
A) Lead stearate
B) Magnesium stearate
C) Sulphur stearate
D) Zinc stearate
.
Answer:D
Q. Which of the following devices is used for the mixing or complete formation of the shell sand mixture?
A) Chucker
B) Mueller
C) Semi circular roller
D) Semi cylindrical roller
.
Answer:B
Q. Which of the following metals is used for the preparation of patterns in shell moulding?
A) Aluminium
B) Copper
C) Grey cast iron
D) Brass
.
Answer:C
Q. Which of the following devices is used for the formation of shell mould in the shell moulding procedure?
A) Air roller
B) Re-circulating ball roller
C) Chucker
D) Dump box
.
Answer:D
Q. At the last of shell moulding procedure, the Dump box is rotated backward for adhering of as much as the possible amount of sand to the metallic pattern.
A) True
B) False
.
Answer:B
Q. Over-curing or under-curing of the shell mould, leads to the generation of sophisticated problems in the shell mould.
A) True
B) False
.
Answer:A
Q. There is no need for any external support for the shells at the time of pouring of molten metal.
A) True
B) False
.
Answer:B
Q. Which of the following types of clamping is mostly performed for the joining of shells?
A) Mechanical
B) Electrical
C) Pneumatic
D) Hydraulic
.
Answer:A
Q. Which of the following is used as the pattern material in precision investment casting?
A) Metal
B) Molten wax
C) Plastic
D) Wood
.
Answer:B
Q. Which of the following liquids is used for the formation of slurry in investment casting?
A) Ammonium hydroxide
B) Carbon disulfide
C) Sodium silicate
D) Glycerin
.
Answer:C
Explanation: To make the mould, the prepared pattern is dipped into slurry made by suspending fine ceramic materials in a liquid called sodium silicate or sometimes another liquid ethyl silicate is also used for the preparation of slurry. The excess liquid is allowed to drain off from the pattern to have an appropriate thickness of the mould.
Q. The process of dipping and stuccoing is performed continuously to achieve the desired thickness of the mould in the investment casting.
A) True
B) False
.
Answer:A
Q. Molten metal is poured into the mould; meanwhile it removes the wax by melting it and vapourization of wax takes place simultaneously in the investment casting.
A) True
B) False
.
Answer:B
Q.Which of the following materials takes part in the removal of remnants wax from the mould?
A) Nitroglycerin
B) Phosphoric acid
C) Water
D) Trichloro-ethylene
.
Answer:D
Q. Pre-heating of the mould is done to generate adhering characteristics of the moulding surface.
A) True
B) False
.
Answer:B
Q. Investment casting is not suitable for producing complex shapes of castings.
A) True
B) False
.
Answer:B
Q. If mercury is used as a pattern material in place of wax, then for the preparation of mould, mercury is kept at temperature_____
A) below -38 ⁰C
B) 0 ⁰C
C) 0 to 38 ⁰C
D) -38 to 0 ⁰C
.
Answer:A
Q. Which of the following is the main problem or disadvantage of using mercury as a pattern material?
A) Variation in density of pattern
B) Less formability
C) Keeping of pattern at too low temperature
D) Less strength
.
Answer:C
Q. Castings produced by investment casting do not require any further machining for finishing of the surface.
A) True
B) False
.
Answer:A
Q. Investment casting is a cheap process with no limits on size and mass of the casting.
A) True
B) False
.
Answer:B
Q. Which of the following products is mostly produced by precision investment casting?
A) Aluminium billets
B) Rail
C) Connecting rod and crankshaft
D) Jewellery and surgical instruments
.
Answer:D
Q. Which of the following is the main purpose of using permanent mould casting?
A) Variety in production
B) Production of castings with complexities
C) Large scale production
D) Production of highly expensive castings
.
Answer:C
Explanation: Making a mould for every casting to be produced may be difficult and expensive for the large scale production. Therefore, a permanent mould, called die may be made from which a large number of castings, anywhere between 100 to 250,000 can be produced easily, depending on the complexity and alloy used for the casting.
Q. In permanent mould casting, only the metallic type of cores can be used, as the mould material used is also metallic.
A) True
B) False
.
Answer:B
Explanation: Cores are used in permanent mould casting for making any hollow portions in the casting. The cores can be made out of metal or sand also when sand cores are used in the casting, the process is called semi-permanent moulding. The sand core of complex shapes can be used with undercuts easily in the casting.
Q. For complicated shapes, it is better to use collapsible metal cores rather than a single metal core in the casting.
A) True
B) False
.
Answer:A
Explanation: It is difficult to securely position the metallic core as a single piece due to the dimensional variations that are likely to occur. So the collapsible metal cores (multiple piece cores) are sometimes used in permanent moulds, but the designer has to provide coarse tolerance on the dimensions.
Q. Metallic core is more preferable than the sand core in the permanent mould casting.
A) True
B) False
.
Answer:B
Explanation: Metallic core is not preferable that the sand core, because the metallic core cannot be complex with undercuts and the like. Also, the metallic core is to be withdrawn immediately after solidification; otherwise, its extraction becomes very difficult because of its shrinkage.
Q. Experiment with gating systems in sand casting is performed before the construction of gating systems for the metallic mould.
A) True
B) False
.
Answer:A
Explanation: The gating and risering systems used in the permanent mould casting are very similar to that of the sand casting. In fact, to get the proper gating arrangement, it is desirable first to experiment with various gating systems in sand casting and then finally arrive at the correct gating system for the metallic mould.
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6. It is desirable to have drafts or undercuts as much as possible in the mould cavity, to have greater strength of the castings.
A) True
B) False
.
Answer:B
Explanation: The mould cavity should be simple without any undesirable drafts or undercuts because these interfere with the ejection of the solidified castings and makes the casting weak and less durable. And care should be taken to see that progressive solidification occurs toward the riser, in the designing of permanent moulds.
Q. Which of the following is not the function of coating of refractory materials on the mould?
A) Prevent the soldering of metal to the mould
B) Minimize thermal shock to the mould
C) Control the rate of casting solidification
D) Increase the heat transfer rate
.
Answer:D
Explanation: The moulds are coated with a refractory material to increase the mould life by preventing the soldering of metal to the mould, by controlling the direction and rate of the casting solidification and also by minimizing the thermal shock to the moulding material. Coatings can be a mixture of sodium silicate, clay, soap, stone, talc etc.
Q. What should be the maximum desirable thickness of the coatings applied to the mould?
A) 0.8 mm
B) 2 mm
C) 5 mm
D) 10 mm
.
Answer:A
Explanation: The main requirement of a coating is that it should be inert to the casting alloy. The coating can be applied by brushing or spraying. It should be thick enough to fill up any surface imperfections. Generally, the maximum desirable thickness of a coating of refractory material is about 0.8 mm.
Q. The coating is applied thicker at surfaces, where the faster cooling rate is required.
A) True
B) False
.
Answer:B
Explanation: The coatings can be both of insulating type and lubricating type. The coatings can be applied thicker at surfaces, which need to be cooled slowly, for example, sprues, risers, thin sections and runners. More the thickness of the coatings less will be the heat transfer rate from the castings.
Q. In permanent mould casting, the temperature at which the mould is used does not depend on _____
A) casting weight
B) casting wall thickness
C) pressure in casting
D) pouring temperature
.
Answer:C
Explanation: Under the regular casting cycle, the temperature at which the mould is used depends on the casting weight, casting shape, casting cycle frequency, pouring temperature, wall thickness of the castings, wall thickness of the mould and the thickness of the mould coating.
Q. In permanent mould casting, the mould is pre-heated to its operating temperature before the actual use of mould.
A) True
B) False
.
Answer:A
Explanation: When the casting is done with the cold die, the first few castings are likely to have misruns (Misrun is caused when the metal is unable to fill the mould cavity completely) till the die reaches its operating temperature. To avoid this, the mould must be pre-heated to its operating temperature, preferably in an oven.
Q. Permanent mould casting is suited to low volume production of moderate or complex shapes of casting.
A) True
B) False
.
Answer:B
Q. Which of the following considerations distinguish die casting from the permanent mould casting?
A) Moulding material
B) Way of pouring molten metal
C) Coating on mould
D) Size of castings
.
Answer:B
Q. It is easy to produce any complex shapes and narrow sections in the die casting.
A) True
B) False
.
Answer:A
Q. Due to the presence of ejector die, there is no need of lubricant for the removal of casting from the dies.
A) True
B) False
.
Answer:B
Q. A single piece or unitary part of the metallic die is used for making castings in die casting.
A) True
B) False
.
Answer:B
Q. Which of the following ways of cooling is used for the maintaining of die temperature?
A) Natural air cooling
B) Forced air cooling
C) Water channels cooling
D) Liquid nitrogen cooling
.
Answer:C
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Q. In cold chamber die casting, rapid cooling of the castings is done as compared to the hot chamber die casting.
A) True
B) False
.
Answer:B
Q. In the hot chamber die casting process, which of the following parts is used for the pumping of liquid metal into the cavity?
A) Accumulator
B) Slug
C) Guide pin
D) Gooseneck
.
Answer:D
Q. In hot chamber die casting processes, downward motion of plunger in the gooseneck leads to injection of molten metal into the cavity with high pressure.
A) True
B) False
.
Answer:A
Q. In hot chamber die casting, the plunger is also used for taking back of unused molten metal to the gooseneck after the fulfilling of the cavity.
A) True
B) False
.
Q. Which of the following materials is not suitable to be cast by a hot chamber die casting process?
A) Lead
B) Tin
C) Aluminium
D) Zinc
.
Answer:C
Q. Using of the ladle in the cold chamber die casting has no affects on contact time between the molten metal and the shot chamber.
A) True
B) False
.
Answer:B
Q. The chances of defects in the castings by cold chamber die casting are more than the castings produced by hot chamber die casting.
A) True
B) False
.
Answer:A
Q. Which of the following show can the approximate number of castings be produced by gravity die casting?
A) 0-50
B) 50-100
C) 100-250,000
D) 250,000-500,000
.
Answer:C
Q. Gravity die casting is best suited for highly viscous molten metal and for producing the complex shape of castings.
A) True
B) False
.
Answer:B
Q. Which of the following considerations is independent for the selection of moulding material?
A) Size of the casting
B) Frequency of casting cycle
C) Pouring temperature
D) Fluidity of pouring melt
.
Answer:D
Q. Which of the following materials is mostly used as a die material in gravity die casting?
A) Grey cast iron
B) Lead
C) Magnesium
D) Aluminium
.
Answer:A
Q. The die life is less for higher melting temperature alloys in gravity die casting.
A) True
B) False
.
Answer:A
Q. Continuous extraction of heat is necessary to ensure higher mould life and better casting cycle times.
A) True
B) False
.
Answer:A
Q. Air cooling is sufficient to maintain temperature for the large and thick-walled castings in gravity die casting.
A) True
B) False
.
Answer:B
Q. Water cooling is always preferred than the air cooling for the extraction of heat from the castings through the mould.
A) True
B) False
.
Answer:B
Q. If the heavy casting is produced, then which of the following can be used to maintain the progressive solidification?
A) Sprue
B) Riser
C) Chills
D) Pouring basin
.
Answer:C
Q. Better surface finish with the close dimensional tolerances of the casting can be obtained in gravity die casting.
A) True
B) False
.
Answer:A
Q. All kind of metals can be cast easily in the gravity die casting.
A) True
B) False
.
Answer:B
Q. Which of the following processes is most suitable for the casting of connecting rods and pistons of the automobile?
A) Precision investment casting
B) Gravity die casting
C) Shell moulding
D) Centrifugal casting
.
Answer:B
Q.Which of the following problems arises in die casting that can be solved by having vacuum die casting?
A) Overheating
B) Interruption in progressive solidification
C) Air in the cavity
D) Difficulty in cooling of casting
.
Answer:C
Q. In vacuum die casting, the molten metal does not experience any back pressure while injecting it into the die cavity.
A) True
B) False
.
Answer:A
Q. In vacuum die casting, the molten metal enters into the cavity slowly as compared to the die casting.
A) True
B) False
.
Answer:B
Q. The castings made by vacuum die casting have more strength than the castings made by die casting.
A) True
B) False
.
Answer:A
Q. Which of the following helps in reducing the oxidation of the material in vacuum die casting?
A) Mould thickness
B) Mould material
C) Tight tolerances
D) Mould coating
.
Answer:C
Q. Rapid solidification rates of casting tend to have a reduction in oxidation of the material.
A) True
B) False
.
Answer:A
Q. Which of the following helps in removing of casting from the ejector die?
A) Tie bar
B) Plunger
C) Platen
D) Ejector pins
.
Answer:D
Q. The moving cores are used in the vacuum die casting, which are parallel to the movement of a die.
A) True
B) False
.
Answer:B
Q. Which of the following parts is fixed to the stationary platen of the casting machine?
A) Cover die
B) Ejector die
C) Sprue
D) Runner
.
Answer:A
Q. Which of the following is used to remove the metal defect of cold shuts from the casting?
A) Ejector pins
B) Overflows
C) Metal cores
D) Biscuit/Sprue
.
Answer:B
Q. Overflows should be avoided as much as possible in the designing of a die.
A) True
B) False
.
Answer:A
Q. Short cycle time leads to having a high temperature of the dies in the vacuum die casting.
A) True
B) False
.
Answer:A
Q. Which of the following methods of casting is best suited for casting aluminium and magnesium based alloys?
A) Centrifugal casting
B) Low-pressure die casting
C) Shell moulding
D) Investment casting
.
Answer:B
Q. What should be the pressure range (in bar) of the gas used in the low-pressure die casting?
A) 0.3 to 1.5
B) 2 to 10
C) 10 to 30
D) 30 to 50
.
Answer:A
Q. In low-pressure die casting, mould is placed over the furnace containing the molten metal.
A) True
B) False
.
Answer:A
Q. The residual molten metal cannot flow back to the crucible and it remains in the riser tube.
A) True
B) False
.
Answer:B
Q. Which of the following types of cooling is used for the cooling of top and bottom dies in the low-pressure die casting?
A) Water cooling
B) Liquid nitrogen cooling
C) Cooling with fins
D) Air jets cooling
.
Answer:D
Q. It is not necessary to consider the cooling circuits in designing of mould due to less cycle time.
A) True
B) False
.
Answer:B
Q. In low-pressure die casting, metal enters the mould very slowly as compared to the die casting.
A) True
B) False
.
Answer:A
Q. Which of the following terms is used for the presence of excess metal in the parting plane?
A) Toggle
B) Platen
C) Flash
D) Biscuit
.
Answer:C
Q. Which of the following products is most suitable to cast by low-pressure die casting method?
A) Crank cases
B) Blades of turbine
C) Surgical instruments
D) Connecting rods
.
Answer:A
Q. The die has longer life for casting of materials but less for aluminium alloys.
A) True
B) False
.
Answer:A
Q. Surface finish of the castings is not better in the low-pressure die casting method as compared to other method of casting.
A) True
B) False
.
Answer:B
Q. Low-pressure die casting method is not economical for small-scale production.
A) True
B) False
.
Answer:A
Q. Which of the following forces provides continuous pressure on the metal in centrifugal casting?
A) Spring force
B) Centrifugal force
C) Gravitational force
D) Frictional force
.
Answer:B
Q. Which of the following methods of casting is best suited for casting of hollow pipes and tubes?
A) Investment casting
B) Permanent mould casting
C) Die casting
D) Centrifugal casting
.
Answer:D
Q. Special type of sand cores is mainly used for the making of hollow part in the centrifugal casting.
A) True
B) False
.
Answer:B
Q. The axis of rotation of the mould should be horizontal for the casting of long pipes in centrifugal casting.
A) True
B) False
.
Answer:A
Q. Dry sand cores may be required for the provision of spigot at the end section of the casting.
A) True
B) False
.
Answer:A
Q. Which of the following parts is provided in between the mould and casing to reduce the vibrations?
A) Steel balls
B) Metallic roller
C) Viscous fluid
D) Grease
.
Answer:B
Q. In centrifugal casting, only sand moulds can be used due to the problem of sticking of metal.
A) True
B) False
.
Answer:B
Q. In centrifugal casting, the casting yield is approximately equaled to 100%.
A) True
B) False
.
Answer:A
Q. It is also possible to make un-symmetric shape of casting in true centrifugal casting by introducing some variations to the mould.
A) True
B) False
.
Answer:B
Q. Castings made by the centrifugal casting process have negligible porosity.
A) True
B) False
.
Q. In centrifugal casting, a movable pouring basin is employed for the pouring of molten metal.
A) True
B) False
.
Answer:A
Q. The speed of rotation is almost double in semi centrifugal casting as compared to the true centrifugal casting.
A) True
B) False
.
Answer:B
Q. Which of the following types of centrifugal casting process is used for the casting, whose shape of casting is not axi-symmetric?
A) True centrifugal casting
B) Semi centrifugal casting
C) Centrifuging
D) Full centrifugal casting
.
Answer:C
Q. Which of the following methods of casting is the fastest method for the production of constant cross-section shapes of casting?
A) Permanent mould casting
B) Centrifugal casting
C) Continuous casting
D) Die casting
.
Answer:C
Q. The rolling process is an essential part of the continuous casting for the production of castings.
A) True
B) False
.
Answer:B
Q. Which of the following methods of casting is best suitable for the casting of long length slabs and billets?
A) Investment casting
B) Permanent mould casting
C) Die casting
D) Continuous casting
.
Answer:D
Q. Which of the following is the approximate thickness (in mm) of the skin of casting formed at the initial of continuous casting process?
A) 1 to 5
B) 10 to 25
C) 25 to 75
D) 75 to 150
.
Answer:B
Q.In continuous casting, different cooling rates provide different properties to the castings.
A) True
B) False
.
Answer:A
Q.Which of the following terms is used for the intermediate pouring vessel in continuous casting?
A) Tundish
B) Biscuit
C) Platen
D) Runner
.
Answer:A
Q. Before starting of casting process, a dummy starter bar is used in the continuous casting method.
A) True
B) False
.
Answer:A
Q. Which of the following parts is used for the support of steel shell in continuous casting?
A) Steel balls
B) Conveyor belt
C) Steel rollers
D) Steel frame
.
Answer:C
Q. Higher extent of automation can be possible in a continuous casting method.
A) True
B) False
.
Answer:A
Q. Continuously cast products in the continuous casting show very less segregation.
A) True
B) False
.
Answer:A
Q. Which of the following is used for the reduction of friction between the mould’s surface and metal strand?
A) Water
B) Casting powder
C) Oil
D) Grease
.
Answer:B
Q. Defects like diagonal cracks and blow holes can be induced in the casting by the oscillation of mould.
A) True
B) False
.
Answer:B
Q. The main purpose of squeeze casting is to produce castings of large volume with high segregation.
A) True
B) False
.
Answer:B
Q. In the squeeze casting method, extreme care is taken while pouring of molten metal into the die cavity.
A) True
B) False
.
Answer:A
Q. What should be the range of pressure (in MPA) under which molten metal is pressed to form the castings by squeeze casting method?
A) 10 to 50
B) 50 to 140
C) 140 to 240
D) 240 to 300
.
Answer:B
Q. At the starting of the casting process, the punch should be lowered down in such a way to form a tight seal.
A) True
B) False
.
Answer:A
Q. Shrinkage cavities cannot be reduced by application of pressure; it can only be avoided by having a tight seal in the casting system.
A) True
B) False
.
Answer:B
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Q. The method of squeeze casting is very expensive to use because of its less productivity.
A) True
B) False
.
Answer:B
Q. Which of the following methods of casting is also known as the liquid metal forging?
A) Die casting
B) Continuous casting
C) Permanent mould casting
D) Squeeze casting
.
Answer:D
Q. In squeeze casting, the instant contact between the melt and the die results into the formation of ductile castings of coarse structure due to slow rate of cooling.
A) True
B) False
.
Answer:B
Q. An intermediate feeding component takes part in the in-direct type of squeeze casting.
A) True
B) False
.
Answer:A
Q. Which of the following factors is not considered for the determination of pressure level in the squeeze casting?
A) Shape of the casting
B) Fluidity of the alloy
C) Freezing range of alloy
D) Moulding material
.
Answer:D
Q. Extension of holding time of casting under the punch leads to more strength of the castings.
A) True
B) False
.
Answer:B
Q. In squeeze casting, die preheating temperature is maintained within close limits and very precise.
A) True
B) False
.
Answer:A
Q. Which of the following methods of casting is employed for the casting of open and hollow objects like boots, toys, dolls etc?
A) Die casting
B) Continuous casting
C) Squeeze casting
D) Slush casting
.
Answer:D
Q. Slush casting method always requires automation for the production of castings.
A) True
B) False
.
Answer:B
Q. In slush casting, the method of multiple pouring leads to the fast production of castings.
A) True
B) False
.
Answer:A
Q. A permanent mould is used in the slush casting with some variations for the making of castings.
A) True
B) False
.
Answer:A
Q. Slush casting method is easily applicable to the high melting temperature materials.
A) True
B) False
.
Answer:B
Q. The thickness of the metallic wall of the mould can be used to determine the wall thickness of the casting part in slush casting.
A) True
B) False
.
Answer:A
Q. Porosity in the moulding part cannot affect the casting part in slush casting process.
A) True
B) False
.
Answer:B
8. It is not easy to control the internal geometry of the castings made by a slush casting method.
A) True
B) False
.
Answer:A
Q. In slush casting, much of molten metal is wasted during the process of inverting mould.
A) True
B) False
.
Answer:B
Q. There is no requirement of any type of cores in the method of slush casting.
A) True
B) False
.
Q. Which of the following moulds is used in slush casting, in which mould is broken to remove the castings?
A) Copper mould
B) Iron mould
C) Bronze mould
D) Zinc mould
.
Answer:C
Q. Casting’s strength and other mechanical properties are easily controlled in the slush casting method.
A) True
B) False
.
Answer:B
Q. Which of the following moulds or moulding is also known as sodium silicate process.
A) Shell moulding
B) Permanent moulding
C) Slush moulding
D) Co2 moulding
.
Answer:D
Q. Co2 moulding is mainly used for the increase in strength and hardness of the moulds and cores.
A) True
B) False
.
Answer:A
Q. How much percentage of sodium silicate (Na2SiO3) is added to the sand mixture in Co2 moulding?
A) 0 to 2 %
B) 2 to 6 %
C) 6 to 10 %
D) 10 to 14 %
.
Answer:B
Q. Continuous passing of Co2 through the mould can decrease the strength of mould and results in a weak mould.
A) True
B) False
.
Answer:B
Q. How much time (in a minute) is usually required for the passing of Co2 through the mould?
A) One
B) Two
C) Five
D) Seven
.
Answer:A
Q. Additives can be used for the non-ferrous application to avoid the poor collapsibility of the mould.
A) True
B) False
.
Answer:B
Q. Sometimes over-gassing can cause the sticking of pattern to the mould in Co2 moulding.
A) True
B) False
.
Answer:A
Q. It is very safe to use Co2 in Co2 moulding, so it eliminates the use of any shielding apparatus.
A) True
B) False
.
Answer:A
Q. Which of the following additives are added to the sand in Co2 moulding for the improvement in collapsibility of the sand?
A) Copper oxide
B) Wood flour
C) Aluminium oxide
D) Oil
.
Answer:C
Q. Co2 moulding process is an ideal process, where speed and flexibility is the prime requirement.
A) True
B) False
.
Answer:A
Q. Moisture from the mould can be removed by using of dryer or heater in Co2 moulding.
A) True
B) False
.
Answer:B
Q. Co2 moulding is a kind of sand moulding, but it is not economical than the green sand moulding.
A) True
B) False
.
Answer:A