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Process Equipment and Plant Design

Process Equipment and Plant Design
Which of the following packing materials provides for maximum mass transfer?

Raschig rings
Lessig rings
All of these
Cross-partition rings

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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
Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is

More or less depending upon the pressure & temperature inside the vessel and the nature of the fluid contained therein
Same
Less
More

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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

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

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Process Equipment and Plant Design
Movement of pipeline caused by thermal expansion is taken care by providing

All of these
Change in the shape of pipeline
Expansion joint
Changes in its direction

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Process Equipment and Plant Design
The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is

1.25
0.25
0.5
0.75

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