GATE ME 2026 Set 1 — Question 30

MCQ+1 / -0.33MediumCasting Defects & YieldCastingManufacturing Processes

Manufacturing Processes → Casting → Casting Defects & Yield

Last updated 5 September 2026

Question

In relation to metal casting defects, match the following Defect Description P. Dross I. Shallow blow found on a flat casting surface Q. Scab II. Lighter impurities appearing on the top surface of a casting R. Scar III. A rough, thin layer of metal, protruding above the casting surface, on top of a thin layer of sand

Defect	Description
P. Dross	I. Shallow blow found on a flat casting surface
Q. Scab	II. Lighter impurities appearing on the top surface of a casting
R. Scar	III. A rough, thin layer of metal, protruding above the casting surface, on top of a thin layer of sand

Correct answer (A) P-II, Q-III, R-I Solution The matching of casting defects with their descriptions is as follows: 1. Dross (P) : These are lighter impurities (like oxides) that float to the top of the molten metal and appear on the top surface of the casting. Match: P-II . 2. Scab (Q) : A scab is a rough, thin layer of metal protruding from the casting surface, typically caused by sand expansion which traps a thin layer of sand between the metal and the mold. Match: Q-III . 3. Scar (R) : A scar is a shallow blow or depression found on a flat casting surface, usually due to gas entrapment. Match: R-I . Therefore, the correct sequence is P-II, Q-III, R-I, which corresponds to option (A). Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (A) P-II, Q-III, R-I Solution The matching of casting defects with their descriptions is as follows: 1. Dross (P) : These are lighter impurities (like oxides) that float to the top of the molten metal and appear on the top surface of the casting. Match: P-II . 2. Scab (Q) : A scab is a rough, thin layer of metal protruding from the casting surface, typically caused by sand expansion which traps a thin layer of sand between the metal and the mold. Match: Q-III . 3. Scar (R) : A scar is a shallow blow or depression found on a flat casting surface, usually due to gas entrapment. Match: R-I . Therefore, the correct sequence is P-II, Q-III, R-I, which corresponds to option (A).

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