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

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

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Process Equipment and Plant Design
In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement

Facilitates easier shell side cleaning; hence is more suitable for handling high dirt factor shell side fluid
Results in higher shell side pressure drop
Can accomodate less number of tubes for a given shell diameter
Creates relatively lower turbulence on the shell side resulting in lower shell side heat transfer co-efficient

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