Process Equipment and Plant Design
The length of straight rectangular weir used on cross-flow trays is generally __________ the column diameter.

Twice
2 ft irrespective of (for column > 3 ft diameter)
0.6-0.8 times
Equal to

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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
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

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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 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
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

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