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Process Equipment and Plant Design

Process Equipment and Plant Design
Back-trapping in a distillation column results due to

Low reflux ratio
Excessive liquid gradient over the tray
Low gas velocity
High gas velocity

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Process Equipment and Plant Design
The value of fouling factor depends upon the

Velocity of process fluid containing suspended solids
Characteristic of process fluid
All of these
Suspended solids in the fluid

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

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

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Process Equipment and Plant Design
In actual operation of a bubble cap distillation tower, the __________ at the bottom of the tower is more than that at the top of the tower.

Molal flow rate of vapour
Vapour molecular weight
All of these
Pressure and temperature

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Process Equipment and Plant Design
In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the

Liquid gradient on the tray
Lower static submergence
Lower skirt clearance
Small downcomer liquid seal

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Process Equipment and Plant Design
For identical operating conditions, the pressure drop over __________ tray is the highest out of the following.

Bubble cap
Counterflow
Valve
Sieve

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