Multiple choice general knowledge science & technology

Rapping allowance is provided on a pattern to take care of

  1. shrinkage

  2. distortion

  3. machining

  4. easy withdrawl
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Rapping allowance on a pattern is provided to ensure easy withdrawal of the casting from the mold. Rapping involves loosening or vibrating the pattern slightly before removal to break the adhesion between the pattern and the sand mold, preventing damage to either the pattern or the mold cavity during withdrawal.

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