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

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

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Process Equipment and Plant Design
Bubble cap tray is the most commonly used tray in large distillation column, because

Of its flexibility and nearly constant efficiency under varying conditions of operation
It incurs less pressure drop as compared to any other try designed for the same duty
None of these
It eliminates the foaming and entrain-ment tendency during operation

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