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Process Equipment and Plant Design

Process Equipment and Plant Design
For identical operating conditions, the pressure drop over __________ tray is the highest out of the following.

Counterflow
Sieve
Valve
Bubble cap

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Process Equipment and Plant Design
Welded joint efficiency in the design of chemical process equipment is taken as

0.85
0.95
0.75
0.55

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Process Equipment and Plant Design
In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to

2
∞
1
20.8

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Process Equipment and Plant Design
The maximum liquid gradient over a tray must not exceed

2"-3.5"
0.5" -1.25"
5"
Half the tray spacing

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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

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

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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.

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

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