The GATE Grind

GATE 2025 MT – Question 42

Manufacturing Processes · Metal casting · 2 marks · Multiple choice

Match the casting defects in Column I with the characteristic features in Column II.

Column I:

P. Misrun

Q. Expansion scab

R. Pin holes

S. Hot tearing

Column II:

1. Penetration of liquid metal behind surface layer of sand moulds

2. Metal solidifies prematurely in the mould and some sections of the casting are not filled

3. Cracking because of restraint to contraction in certain areas of the casting during solidification and cooling to room temperature

4. Evolution of gases during solidification resulting in porosity

  1. P – 2, Q – 4, R – 3, S – 1
  2. P – 1, Q – 3, R – 2, S – 4
  3. P – 1, Q – 2, R – 4, S – 3
  4. P – 2, Q – 1, R – 4, S – 3

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Show answer and explanation

Correct answer: (D) P – 2, Q – 1, R – 4, S – 3

Explanation

Misrun is incomplete filling due to premature freezing (P2). Expansion scab permits metal behind an expanded sand surface layer (Q1). Pinholes arise from evolved gas (R4). Hot tearing results from restrained contraction during cooling/solidification (S3). Hence **D**.