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GATE 2021 AG – Question 46

Dairy and Food Engineering · Heat and Mass Transfer · 2 marks · Multiple choice

Match P pipe-in-pipe;Q shell-and-tube;R1–2 shell-and-tube;S crossflow exchanger, to 1 air cooling,2 simultaneous co-/counter-current exchange,3 large flow,4 small exchange area.

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

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Show answer and explanation

Correct answer: (D) P–4,Q–3,R–2,S–1

Explanation

Double-pipe exchangers suit small required areas;multiple-tube shell exchangers suit large flows. One shell pass with two tube passes includes regions of co-current and counter-current exchange. Crossflow is common in air cooling. Thus **P–4,Q–3,R–2,S–1,D**.

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