Process Equipment and Plant Design
Liquid gradient over the tray results due to the

Large plate spacing
Large reflux ratio
Resistance offered to flow of liquids by caps & risers and the flow of gas
Low gas velocity

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Process Equipment and Plant Design
Pick out the wrong statement about the design of seive plate column and the bubble cap column.

Weir length for a bubble cap plate is the same as that for the seive plate
The downcomer design and the residence time in the downcomer is almost same for seive plate and bubble cap columns
Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the seive plate
Weir height for a bubble cap plate column is the same as that for a seive plate column

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

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