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

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

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Process Equipment and Plant Design
A stuffing box is used for

Prevention of fluid leakage around moving parts
Facilitating smooth opening and closing of a valve
Reducing the resistance of fluid flow
Absorbing the contraction/expansion of pipeline due to temperature changes

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