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GATE 2024 Chemical Engineering, Q24 · Mass Transfer

The correct answer is B, Tray towers are preferred over packed towers for systems requiring frequent cleaning..

Question

Which one of the given statements is correct with reference to gas-liquid contactors for mass transfer applications?

  • A. A tray tower is more suitable for foaming systems than a packed tower.
  • B. Tray towers are preferred over packed towers for systems requiring frequent cleaning.
  • C. For a given liquid flow rate, the gas flow rate in the loading region is greater than that in the flooding region.
  • D. Flooding can never occur for counter-current contact.

Official answer: Tray towers are preferred over packed towers for systems requiring frequent cleaning.

Why

GATE 2024 official key: (B). Trays are more accessible for inspection and cleaning than packing, so they are preferred when frequent cleaning is required. Packed towers generally handle foaming systems better; flooding occurs above the loading region (not below); and flooding can occur in any counter-current contactor.

Explanation cross-checked for consistency. Final answer matches the official IIT answer key.

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