Mechanical Operations
The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an

Electrostatic precipitator
Wet scrubber
Bag filter
Cyclone separator

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Mechanical Operations
Cumulative analysis for determining surface is more precise than differential analysis, because of the

Assumption that all particles in a single fraction are equal in size, is not needed
Fact that screening is more effective
Assumption that all particles in a single fraction are equal in size
None of these

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