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Process Equipment and Plant Design

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

180
8
1
80

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Process Equipment and Plant Design
In a multipass shell and tube heat exchanger, the shell side cross flow area does not depend upon

None of these
Clearance
Baffle spacing
Pitch

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Process Equipment and Plant Design
Value of Peclet number = 0, is the representative of

Laminar flow
Plug flow
Eddy diffusivity = 0
Complete back mixing

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

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

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Process Equipment and Plant Design
__________ shapedroof is the most commonly used roof for cylinderical storage tanks.

Umbrella
Conical
Dome
Flat

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

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