Process Equipment and Plant Design
With increase in pressure drop (for a given particle size), the dust collection efficiency of a cyclone separator will

Remain unaffected
Increase or decrease depending on the nature of the dust
Increase
Decrease

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Process Equipment and Plant Design
In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be

D₂ - D₁ (D₁ and D₂ are I.D. of inner and outer pipes respectively)
Less than that for fluid flow
More than that for fluid flow
Same as that for fluid flow

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