Process Equipment and Plant Design
In a bag filter, the pressure drop increases directly as the

None of these
Density of the gas and inversely as viscosity of the gas
Density of the gas, but is independent of the viscosity of the gas
Viscosity of the gas and inversely as density of the gas

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Process Equipment and Plant Design
Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger

Permits the use of more tubes in a given shell diameter
Both B and C
Permits the use of less tubes in a given shell diameter
Facilitates comparatively easier external cleaning because of large clearance

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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)
Feed is not at its bubble point
Number of equilibrium stages required is likely to be very small
Number of equilibrium stages in only stripping section is to be calculated

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