MCQ’s On Casting Process
Q. Which of the following is the main advantage of using investment casting method?
A. Better quality
B. Low cost
C. Complex shapes
D. Reusable mould
.
.Answer: C
Explanation: Process In investment casting method, wax is used as pattern material on which slurry is coated and then wax is taken out by melting it. This Process of casting is widely used for producing complex shapes of castings. It has many other advantages like good dimensional accuracy and rapid production rate of the casting components.
Q. Expensive moulding Process is the major disadvantage of using the sand casting Process.
A. True
B. False
.
.Answer: B
Explanation: Process Sand casting is a Process which is widely used for the production of simple casting products and it is very economical method of casting as compared to other methods of castings because the mould making Process is very cheap Process, so low cost is involved in the operations and it can be used for casting almost all the alloys.
Q. In slush casting method, negligible metal loss is the main advantage during the casting Process.
A. True
B. False
.
.Answer: A
Explanation: Process The metal does not get wasted by the slush casting method. Even this method saves the molten metal by collecting it, which can be reused for the other casting Process. This method makes the casting light in weight by saving the molten metal; hence this method is very economical for the production of castings.
Q. Which of the following is the drawback of using the low-pressure die casting technique?
A. Material loss
B. Time consuming
C. Much labour work
D. Uneconomical for small scale production
.
..Answer: D
Explanation: Process Low-pressure die casting technique is not economical for small-scale production because the machines used in the Processes are very expensive, the parts like riser tube and the device used for compressing the gas makes this method very expensive. So this method is only economical when it is used for large scale productions.
Q. Which of the following is not the advantage of using the permanent mould casting method?
A. Mould can be used again and again
B. Good thermal conductivity of mould
C. Very complex shapes of casting can be produced
D. Low cost Process
.
.Answer: C
Explanation: Process In permanent mould casting method, a metallic mould is used which can be used again and again, and it has good thermal conductivity too. But this method is not appropriate for producing very complex shapes of castings. For complex shapes casting, the investment casting method is mainly preferred which can produce high extent of complexities in the casting components.
Q. Large volume casting with great segregation is the main advantage of using the squeeze casting method.
A. True
B. False
.
.Answer: B
Explanation: Process In the squeeze casting method, the main purpose is to produce castings of compact size with better strength. In this method, product quality is greatly improved by solidifying the casting under heavy pressure to prevent the dissolving of gases in the solution until the solidification of the casting is completed.
Q. Which of the following is the main advantage of using the centrifugal casting method?
A. Defects less casting
B. Maximum casting yield
C. Low cost
D. Fast production of castings
.
.Answer: B
Explanation: Process In centrifugal casting technique, there is no need for the gates and runners to be used in the Process, which can save a lot of molten metal. This makes the increase in casting yield which can reach to the maximum that means negligible metal loss. And no cores are required during the Process which makes this method very economical for the large scale production of castings.
Q. Which of the following is the main disadvantage of using the hot chamber die casting Process?
A. High tooling cost
B. Slow production rate
C. Rough surface finish
D. Not economical for large scale production
.
.Answer: A
Explanation: Process In the hot chamber dies casting Process, many devices like gooseneck, plunger, toggle etc. are used which are generally very costly as compared to the devices used in the other method of castings. Due to this, high tooling cost is the main disadvantage of using this Process, and casting of limited size components is another drawback of this method.
Q. Which of the following is the drawback of using the sand casting Process?
A. Limited alloys
B. Expensive mould
C. Uneconomical for low quantities
D. Labour intensive
.
..Answer: D
Explanation: Process In sand casting Process, the sand is rammed by using the rammer and then the cope and drag box are used as a moulding box to prepare the mould. In this Process, much of time is spent and it requires too much labour work. So this method is normally used for small scale production for producing small size castings.
Q. Which of the following is the main drawback of using the shell mould casting method?
A. Limited size of casting parts
B. High cost
C. Rough surface finish
D. Slow rate production
.
.Answer: A
Explanation: Process In shell moulding Process, a dump box is used in which a heated metallic pattern is inserted with the sufficient amount of coating sand, then the dump box is rotated by which the pattern has adhered to the coating sand and then the pattern is extracted out by melting. In this Process, due to limited size of the dump box, only limited size of casting parts can be produced.
Q. In die casting technique, a single metallic die is used for the production of casting components.
A. True
B. False
.
.Answer: B
Explanation: Process In die casting technique, the casting Process starts when the parts of the die are apart. It generally consists of two parts in which one part is called as stationary half or cover die that fixed to the die casting machine. Another part is called a moving part or ejector die that can slide for extracting out the casted product.
Q. The entrapment of gas is negligible in the squeeze casting method that results in lower shrinkage cavities in the castings.
A. True
B. False
.
.Answer: A
Explanation: Process The squeeze casting technique almost has negligible gas entrapment which results in less shrinkage cavities and good quality of surface with fine details on the casting parts. Aluminum and copper alloys are widely manufactured by this technique. It also produces the fine grain size to enhance the properties of the castings.
Q. Investment casting technique cannot produce complex shapes of castings with deep features.
A. True
B. False
.
.Answer: B
Explanation: Process In investment casting method, complex shapes castings are easily manufactured without any significant defects in the castings. In this method, the pattern is withdrawn by melting it, that’s why it can produce any complex shape casting with deep features. And the thin sections with complexities can also be produced by this method.
Q. In continuous casting technique, the high extent of automation is required for the production of castings.
A. True
B. False
.
.Answer: A
Explanation: Process In continuous casting technique, the operations cannot be performed manually, so higher extent of automation is required in this method to perform the operations easily. For example, cutters, metallic rollers, water sprayers etc. are the automatic equipment which are required to be used for the production of casting components.
Q. Slush casting technique cannot be used for the production of high melting temperature metal castings.
A. True
B. False
.
.Answer: A
Explanation: Process In slush casting technique, high melting temperature metals like brass and aluminium cannot be used for casting because high temperature of molten metal can produce defects in the casting parts and mould. So, only low melting temperature metals can be used in the slush casting system.
Q. In permanent mould casting method, metallic cores are mainly used instead of sand cores.
A. True
B. False
.
.Answer: B
Explanation: Process In permanent mould casting technique, metallic cores are not used generally because the metallic cores cannot be complex with undercuts in the casting Process. Also, the metallic core is to be withdrawn immediately after solidification; otherwise, its extraction becomes difficult due to its shrinkage in the mould. So, sand cores are mainly preferred in this method for the casting Process.
Q. In Co2 moulding technique, the amount of water is zero percent in the sand mixture used for mould.
A. True
B. False
.
.Answer: A
Explanation: Process In Co2 moulding technique, water is not mixed with the sand mixture while preparing the mould. Sodium silicate is generally added in the place of water to act as a binder. So the moisture is completely eliminated from the mould. Due to moisture-less mould, the Process can provide high accuracy in the production of casting parts.
Q. In vacuum die casting, the melt enters into the mould cavity with less speed than that in the die casting technique.
A. True
B. False
.
.Answer: B
Explanation: Process In the vacuum die casting method, the removal of all the gases from the cavity makes the vacuum inside the mould cavity, so the force and pressure are negligible in magnitude inside the mould cavity which could be opposite to the injecting pressure of the melt. So, the melt enters into the die with very high speed which also decreases the filling time of melt.
Q. Which of the following casting techniques is the best technique for casting tubes and hollow pipes?
A. Die casting
B. Slush casting
C. Centrifugal casting
D. Investment casting
.
.Answer: C
Explanation: Process Centrifugal casting technique is the best technique and widely used for casting the tubes and hollow pipes which are symmetric in structure with a concentric hole. In this method, molten metal is accumulated at the inward surface of the mould by the fast rotation of mould and then the casting part is extracted from the mould after the complete solidification.
Q. In the gravity die casting technique, not every metal can be casted easily.
A. True
B. False
.
.Answer: A
Explanation: Process In the gravity die casting method, not every metal can be casted easily because of using a metallic mould in the casting Process. In this method, the sticking problem arises when metallic mould interacts with the casting metal. Due to this, much of lubricant is used, but still, this method is not suited for every metal.
Q. The electron beam technology is not much efficient as compared to the laser technology used for manufacturing.
A. True
B. False
.
.Answer: B
Explanation: Process The electron beam technology is several times more efficient as compared to the laser technology. This technology results in less power consumption, less maintenance and low manufacturing costs. In this technology, electron beam melting Process combines with vacuum, which can provide high power and excellent material properties.
Q. The main purpose of electron beam melting is to build up the metal parts by layer forming.
A. True
B. False
.
.Answer: A
Explanation: Process In this technology, first the part is designed by the 3D CAD software, and then the file is transferred to the Processing software where the geometry is sliced into thin layers. The material is melted by electron beam to fit the geometry defined by the computer model. Then the metal parts are made by layers forming via electron beam melting Process in a vacuum chamber.
Q. In the electron beam technology, no any cleaning operations are required for the finishing of metal parts.
A. True
B. False
.
.Answer: B
Explanation: Process In the electron beam technology, when the whole Process from CAD software to metal formation is completed, then the net shape metal part can be cleaned and finished by any conventional methods. Finishing and cleaning are very necessary and important for a casting to be used in applications.
Q. Which of the following devices is used for generating the electron beam in electron beam melting Process?
A. Beam striker
B. Beam laser
C. Electron beam gun
D. Electron runner
.
.Answer: C
Explanation: Process In electron beam melting Process, the electron beam is generated by a device called electron beam gun which is generally located at the top of a vacuum chamber. The Electron Beam Gun is fixed and the beam is deflected to arrive at the desired area, which can melt the metal to form the desired shape of metal parts.
Q. In electron beam melting technology, the speed of electron is almost equal to the speed of light.
A. True
B. False
.
.Answer: B
Explanation: Process In electron beam melting technology, the electrons are emitted from a filament which is generally heated to very high temperature. Then the electrons are accelerated to half the speed of light in the electric field. The beam of electrons is mainly controlled by two magnetic fields in the vacuum chamber. No object can achieve the speed equal to the speed of light in the universe.
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Q. Which of the following is the advantage of using the electron beam melting technology?
A. Low cost
B. Good surface finish
C. Low maintenance
D. Negligible impurities
.
..Answer: D
Explanation: Process Electron beam melting is a vital technology in industries. This method has many advantages like high strength properties of metal, high energy level and the most important is the negligible impurities in the metal parts, because this Process uses a vacuum chamber that eliminates the all kind of impurities like oxides, nitrides etc.
Q. High cost is the only main drawback of using the electron beam technology for the production of metal parts.
A. True
B. False
.
.Answer: A
Explanation: Process In electron beam melting technology, the vacuum chamber is used which requires maintenance time to time and a shield is also used during the Process’s which covers the x-rays produced by the electron beam in the Process. These all expensive equipment are used which makes this technology very costly.
Q. The operations of fabrication in electron beam melting (EBM) are almost similar to that of laser beam melting (LBM).
A. True
B. False
.
.Answer: A
Explanation: Process The operations of fabricating 3D part in the electron beam melting (EBM) are very similar to that of laser beam melting (LBM). However, the major differences between the two systems are the different thickness of powder layer and different building speed which is generally high in the LBM system which gives rise to more rapid cooling in the fabrication of small size specimens.
Q. It is not easy to produce hollow metal parts by the electron beam melting technology.
A. True
B. False
.
.Answer: B
Explanation: Process The electron beam melting (EBM) Process can produce hollow metal parts with internal features, which are not easily produced by any other method. The EBM technology can provide the required mechanical strength and many properties with much less mass of the metal parts. This reduces the cost involved in the raw materials and the weight of the component.
Q. In the electron beam melting Process, the kinetic energy is instantly converted into thermal energy.
A. True
B. False
.
.Answer: A
Explanation: Process Electron Beam Melting (EBM) is a rapid manufacturing Process in which when the high-speed electrons emitted from the electron beam gun, strikes the metal particles, the kinetic energy is instantly converted into the thermal energy. This makes a substantial increase in temperature above the melting point of the material.
