Multiple choice general knowledge science & technology

Draft on a pattern is provided for

  1. facilitating pattern making

  2. easy lifting of the casting

  3. facilitating withdrawal of the pattern from the mould

  4. providing for strinkage of the casting
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D Correct answer
Explanation

Draft (or taper) on a pattern is provided to accommodate the shrinkage of metal during cooling and solidification in the casting process. It also facilitates easy withdrawal of the pattern from the sand mold. The slight angular taper (typically 1-3 degrees) accounts for volumetric contraction.

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