Process Equipment and Plant Design
A stuffing box is used for

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

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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
Viscosity of the gas and inversely as density of the gas
Density of the gas and inversely as viscosity of the gas
None of these

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