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Foundry & Forging Mcqs

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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154
Q:

The contractions in the materials depend upon the metallurgical transformation taking place during which of the following process?

A) Solidification B) Melting
C) Calcination D) Smelting
 
Answer & Explanation Answer: A) Solidification

Explanation: When a metal undergoes solidification, it undergoes a decrease in volume which is called contraction and hence is it is a major parameter in the metallurgical transformation which is taken into consideration while designing any component for foundry applications.

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120
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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288
Q:

_________________ is termed as a replica of the object to be made by the casting process.

A) Pattern B) Core
C) Riser D) Spruee
 
Answer & Explanation Answer: A) Pattern

Explanation: A Patten is a casting double which has allowances, provision of the core prints which is used to make a casting. It is a replica into which molten metal will be poured during the casting processes and later the metal is hardened and a component is obtained.

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