Which of the following dust collection equipments is the least efficient (for sub-micronic particles) ?
Correct answer: C. Dust catcher (gravity type)
- A. Bag filter
- B. Cyclone separator
- C. Dust catcher (gravity type)
- D. Hollow wet scrubber
Explanation
A gravity dust catcher relies mainly on low gas velocity and settling, so it cannot effectively remove very small particles. Cyclones, bag filters and wet scrubbers provide stronger collection mechanisms for sub-micronic particles, although their exact performance depends on design.
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