The GATE Grind

GATE 2021 ES – Question 43

Solid and Hazardous Waste Management · Municipal Solid Waste Management · 2 marks · Multiple choice

Match P trommel, Q magnetic separator, R hammer mill, S eddy-current separator to i size reduction, ii aluminium separation, iii screening, iv ferrous recovery.

  1. P–iii, Q–iv, R–i, S–ii
  2. P–iii, Q–ii, R–iv, S–i
  3. P–i, Q–iv, R–iii, S–ii
  4. P–iv, Q–ii, R–i, S–iii

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Show answer and explanation

Correct answer: (A) P–iii, Q–iv, R–i, S–ii

Explanation

A trommel rotates a perforated drum to screen by size. A magnet recovers ferrous metals. A hammer mill reduces size by impact. Eddy currents repel conductive nonferrous metals such as aluminium. Thus **P–iii, Q–iv, R–i, S–ii, A**.

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