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

Viscosity of the gas and inversely as density of the gas
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

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Process Equipment and Plant Design
The function of manholes provided in the shell of a distillation column is to

All of these
Give access to the individual trays for cleaning, maintenance and installation
Guard against foaming & entrainment by dumping antifoaming agent through it
Keep a check on the liquid gradient over the plate by direct visual observation

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