M

Mr. Dubey • 52.30K Points
Coach 

Q. A pattern is shaken by striking it with a wooden piece. A negative allowance is provided for this. Which allowance is it?

(A) machining allowance
(B) rapping allowance
(C) distortion allowance
(D) contraction allowance
Correct : Option (B)

Explanation: 
 in rapping or shake allowance, the pattern is taken out of the mould and it is rapped or shaken, so as to free it from the adjoining sand. due to this, there may be a little increase in the size of the mould cavity.

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