GATE ME 2019 Set 1 — Question 47

MCQ+2 / -0.67EasyCasting Defects & YieldCastingManufacturing Processes

Manufacturing Processes → Casting → Casting Defects & Yield

Last updated 5 September 2026

Question

Match the following sand mold casting defects with their respective causes. Defect Cause P Blow hole 1 Poor collapsibility Q Misrun 2 Mold erosion R Hot tearing 3 Poor permeability S Wash 4 Insufficient fluidity

Correct answer (D) P-3, Q-4, R-1, S-2 Solution The correct matching for sand mold casting defects and their causes is: Blow hole (P) is caused by gas entrapment, which occurs when the mold has poor permeability (3) . Misrun (Q) occurs when the molten metal solidifies before completely filling the mold cavity, typically due to insufficient fluidity (4) . Hot tearing (R) refers to cracks formed during cooling when the mold resists the contraction of the casting, often due to poor collapsibility (1) . Wash (S) is a defect where the mold surface is eroded by the flow of molten metal, caused by mold erosion (2) . Thus, the correct match is P-3, Q-4, R-1, S-2, which corresponds to option (D). Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (D) P-3, Q-4, R-1, S-2 Solution The correct matching for sand mold casting defects and their causes is: Blow hole (P) is caused by gas entrapment, which occurs when the mold has poor permeability (3) . Misrun (Q) occurs when the molten metal solidifies before completely filling the mold cavity, typically due to insufficient fluidity (4) . Hot tearing (R) refers to cracks formed during cooling when the mold resists the contraction of the casting, often due to poor collapsibility (1) . Wash (S) is a defect where the mold surface is eroded by the flow of molten metal, caused by mold erosion (2) . Thus, the correct match is P-3, Q-4, R-1, S-2, which corresponds to option (D).

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