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

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Process Equipment and Plant Design
The minimum tray spacing in distillation column of diameter less than 3 ft is normally __________ inches.

24
6
18
34

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Process Equipment and Plant Design
In a __________ rivetted joint, the number of rivets decreases from the innermost row to the outermost row.

Zig-zag
Chain
None of these
Diamond

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Process Equipment and Plant Design
__________ shaped roof is most commonly used for cylindrical tanks.

Flat
Cone
Dome
Umbrella

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Process Equipment and Plant Design
The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the

Equal sized reactors are the best
Smaller reactor should come first
Larger reactor should come first
None of these

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Process Equipment and Plant Design
Diameter of the seive tray column is determined by the

Lower limit of vapour velocity
Height of the plate spacing
Upper limit of the vapour velocity
Hole diameter of the seive tray

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