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Process Equipment and Plant Design

Process Equipment and Plant Design
Larger depth of liquid on the trays of a distillation column

Results in higher pressure drop per tray
Both A & B
Leads to high tray efficiency
Neither A nor B

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Process Equipment and Plant Design
An adequate clearance between the tray and the shell wall of a distillation column is provided to

Drain the liquid from the tray when the unit is not in operation
None of these
Allow for thermal expansion and facilitate installation
Avoid back-trapping

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Process Equipment and Plant Design
In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed __________ of the column diameter.

1/10-1/15th
1/2 to 1/4th
1/20-1/30th
1/5-1/10th

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Process Equipment and Plant Design
Needle valves are generally not used for

Smaller sizes of pipe
Very accurate flow control
High pressure throttling service
Very large diameter pipes

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Process Equipment and Plant Design
The ratio of linear stress to linear strain is termed as the

None of these
Modulus of elasticity
Bulk modulus
Modulus of rigidity

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Process Equipment and Plant Design
Two iron pipes of the same nominal diameter but different schedule numbers will have the same

None of these
Inside diameter
Outside diameter
Wall thickness

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