The GATE Grind

GATE 2022 PI – Question 41

Manufacturing Processes I · Powder Processing · 2 marks · Multiple choice

Match powder-metallurgy steps P:atomization; Q:sintering; R:compaction; S:infiltration, with descriptions 1:press blended powder into die shapes; 2:produce metal powder; 3:heat below melting point for bonding; 4:contact a sintered part with low-melting metal slug and heat; 5:heat significantly above melting point for bonding.

  1. P–1,Q–5,R–2,S–3
  2. P–3,Q–2,R–1,S–5
  3. P–2,Q–3,R–1,S–4
  4. P–2,Q–5,R–1,S–4

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Correct answer: (C) P–2,Q–3,R–1,S–4

Explanation

Atomization breaks liquid metal into droplets that solidify as powder. Sintering bonds the compact below the main metal’s melting point. Compaction presses powder in a die. Infiltration melts a lower-melting slug into the sintered part’s pores. **P–2,Q–3,R–1,S–4, C**.

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