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

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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.

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

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Process Equipment and Plant Design
Le/D for a Tee (used as elbow, entering run) would be around

60
200
5
350

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Process Equipment and Plant Design
For given number of passes, pitch & tube diameter, the maximum number of tubes that can be accommodated in a shell of tripled inside diameter will be __________ times.

About 3
Considerably more than 9
About 9
Considerably less than 9

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Process Equipment and Plant Design
Holes of a sieve tray are arranged in triangular pitch of __________ times the hole diameter.

1.5 to 2
10 to 15
2.5 to 5
5 to 10

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Process Equipment and Plant Design
For a given design of bubble cap, the number of bubble caps to be used per tray is set by the

Plate spacing
Diameter of the column
Allowable gas velocity through the slots
All of these

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