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Process Equipment and Plant Design

Process Equipment and Plant Design
In packed absorption tower, onset of flooding usually occurs at a pressure drop of about __________ mm of water column per metre height of packing.

200-250
25-50
750-1000
50-75

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Process Equipment and Plant Design
In a distillation column, the minimum residence time for liquid in the downspout is about __________ seconds.

1
180
80
8

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Process Equipment and Plant Design
To avoid the tearing off the plate of an edge, the margin (i.e., the minimum distance from the centre of the rivet hole to the nearest edge of the plate) should be equal to

0.5 d
D
2.5 d
1.5 d

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Process Equipment and Plant Design
The dust collection efficiency of a cyclone separator

Decreases with increase in gas flow rate
None of these
Is inversely proportional to the mass of the dust particle
Is directly proportional to the radius of the dust particle path

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Process Equipment and Plant Design
In inclined long tube vertical evaporators, the tubes are inclined at an angle of

90°
15°
45°
60°

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Process Equipment and Plant Design
Joint efficiency (J) for a seamless pipe is

0.85
1
< 0.5
1.2

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