Process Equipment and Plant Design
The dust collection efficiency of a cyclone separator

Is directly proportional to the radius of the dust particle path
Is inversely proportional to the mass of the dust particle
None of these
Decreases with increase in gas flow rate

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Process Equipment and Plant Design
Smoker's equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the

Relative volatility is close to one (e.g., separation of close boiling isomers)
Number of equilibrium stages in only stripping section is to be calculated
Feed is not at its bubble point
Number of equilibrium stages required is likely to be very small

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