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GATE 2020 MT – Question 45

Materials Science and Non-Metallic Materials · Crystal structures and bonding · 2 marks · Multiple choice

Match P gray iron, Q ductile iron, R zirconium alloy, S beryllium–copper to uses 1 uranium-fuel cladding, 2 heavy-machine bases, 3 valves/pump bodies, 4 jet-aircraft landing-gear bearings.

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

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Show answer and explanation

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

Explanation

Gray iron’s damping and castability suit machine bases, P–2. Ductile iron’s toughness and castability suit valve and pump bodies, Q–3. Zirconium alloys combine nuclear suitability with corrosion resistance for fuel cladding, R–1. Beryllium–copper provides the bearing association S–4. The complete choice is D.

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