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Foundry & Forging Mcqs

Q:

The final dimensions of the pattern are ______ the final dimensions of the casting required.

A) Similar to B) Different from
C) Equal to D) Approximate to
 
Answer & Explanation Answer: B) Different from

Explanation: The Pattern is made given the allowances as required. Once the casting is prepared, the casting is machined to get the required dimensions. Usually, the dimensions of the pattern are more than the dimensions of the castings.

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241
Q:

______________ is used to reduce the chances of damaging the mould cavity.

A) Draft Allowance B) Shrinkage Allowance
C) Finish Allowance D) Machining Allowance
 
Answer & Explanation Answer: A) Draft Allowance

Explanation: At the time of withdrawing a pattern from the sand mould, the vertical faces of the pattern are in continual contract with sand which damages the mould cavity. Hence the pattern is tapered from the parting line and it is called as the draft allowance.

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212
Q:

Castings are usually designed for ________ distribution of loads.

A) Equal B) Unequal
C) Maximum D) Minimum
 
Answer & Explanation Answer: A) Equal

Explanation: The castings are designed for the equal distribution of loads on all the members of the product and for minimum stress concentration in order to achieve more strength and more service life of the casting.

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207
Q:

Scope of automation in foundry process is _____________

A) Low B) High
C) Minimum D) Maximum
 
Answer & Explanation Answer: A) Low

Explanation: The foundry processes are extensively laborious while compared to other manufacturing processes. The productivity when compared to efforts is low. The processes can be mechanized but not automated.

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178
Q:

Air is supplied to cupola using ___________

A) Blowers B) Coolers
C) Tuyeres D) None of the mentioned
 
Answer & Explanation Answer: A) Blowers

Explanation: The Tuyeres are the components in the cupola that extend through the steel shell and refractory wall to the combustion zone and supply air necessary for the combustion. Hence, the wind box that surrounds the cupola supplies the air evenly to all the tuyeres.

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163
Q:

The shrinkage value given to the pattern must be _________ for the outer dimensions which are to be restrained.

A) Lower B) Higher
C) Equal D) Does not alter anything
 
Answer & Explanation Answer: B) Higher

Explanation: In a dry sand core, the centre of the casting may restrain the casting from the contraction but the edges are not restrained. Thus, it is desirable to provide a higher shrinkage allowance.

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134
Q:

_____________ increases SiO2-Na2O ratio that increases the bond.

A) Sulphuric acid B) Acetic acid
C) Carbonic acid D) Hydrochloric acid
 
Answer & Explanation Answer: C) Carbonic acid

Explanation: Passage of carbon-dioxide through the sand containing sodium silicate produces carbonic acid in the aqueous solution. This causes a rise in the SiO2-Na2O ratio and formation of a colloidal silica gel, which hardens and forms the bond between sand grains.

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129
Q:

Which is the most common defect caused by the risers?

A) Blow holes B) Shrinkage
C) Crush D) Mould Shift
 
Answer & Explanation Answer: B) Shrinkage

Explanation: The primary function of the riser (attached with the mould) is to feed metal to the solidifying casting so that shrinkage cavities are get rid of. Hence it can be seen that the common defect is shrinkage which has to be avoided.

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