GATE ME 2024 Set 1 — Question 31

MCQ+1 / -0.33EasyPattern Design & AllowancesCastingManufacturing Processes

Manufacturing Processes → Casting → Pattern Design & Allowances

Last updated 5 September 2026

Question

The allowance provided to a pattern for easy withdrawal from a sand mold is

Correct answer (D) shake allowance Solution Pattern allowances are provided to compensate for various factors in the casting process: 1. Shrinkage allowance : Provided to account for the volume contraction of the metal during cooling. 2. Finishing (Machining) allowance : Provided to ensure enough material is available for subsequent machining operations. 3. Distortion allowance : Provided to compensate for the tendency of the casting to warp due to uneven cooling. 4. Shake (or Rapping) allowance : This is a negative allowance provided to facilitate the easy withdrawal of the pattern from the mold. By rapping (shaking) the pattern, the mold cavity is slightly enlarged, making it easier to pull the pattern out without damaging the mold walls. Note: Draft (or taper) allowance is also provided for easy withdrawal, but since it is not an option, shake allowance is the correct choice. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (D) shake allowance Solution Pattern allowances are provided to compensate for various factors in the casting process: 1. Shrinkage allowance : Provided to account for the volume contraction of the metal during cooling. 2. Finishing (Machining) allowance : Provided to ensure enough material is available for subsequent machining operations. 3. Distortion allowance : Provided to compensate for the tendency of the casting to warp due to uneven cooling. 4. Shake (or Rapping) allowance : This is a negative allowance provided to facilitate the easy withdrawal of the pattern from the mold. By rapping (shaking) the pattern, the mold cavity is slightly enlarged, making it easier to pull the pattern out without damaging the mold walls. Note: Draft (or taper) allowance is also provided for easy withdrawal, but since it is not an option, shake allowance is the correct choice.

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