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

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

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Process Equipment and Plant Design
Overall distillation column efficiency for most of the refinery columns can be given by (for μ = 0.07 - 1.4 cp and relative volatility < 4) (where η = overall column efficiency, % μ = molal average viscosity of feed at average column temperature and pressure, cp Δp = pressure drop per tray, psi)

Η = 0.25 log μ - 1.67
Η = 17 - 61.1 log μ
Η = 1.66 - 0.25 log μ
Η = 24.6 (Δp/μ)

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