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GATE 2020 CE (CE2) – Question 27

Air Pollution and Municipal Solid Wastes · Air pollution: pollutants, sources, impacts, control and air quality index · 1 mark · Multiple choice

A gas contains suspended particles of average sizes 2 μm and 50 μm. Choose the most suitable removal strategy.

  1. Settling chamber followed by bag filter
  2. Electrostatic precipitator followed by venturi scrubber
  3. Electrostatic precipitator followed by cyclonic separator
  4. Bag filter followed by electrostatic precipitator

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Correct answer: (A) Settling chamber followed by bag filter

Explanation

Remove large50 μm particles first in an inexpensive settling chamber,then capture the finer2 μm particles in a bag filter. **A** provides sensible coarse-to-fine staging and limits filter loading. The other sequences put high-efficiency equipment ahead of coarse collection or duplicate fine-particle treatment.