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Process Equipment and Plant Design

Process Equipment and Plant Design
Normally, the length to diameter ratio of rotary dryers varies form 4 to 10 and for its economic operation, the number of transfer units (NTU) for such dryers varies from

3.5-5.5
44119
1.5-2.5
7.5-10.0

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Process Equipment and Plant Design
Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always

Both B & C
More than geometric mean value
More than arithmetic mean value
Less than arithmetic mean value

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

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

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Process Equipment and Plant Design
__________ is the determining factor for the number of bubble caps to be used per tray.

Vapor load
Tray diameter
Liquid load
Permissible slot velocity

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Process Equipment and Plant Design
The value of fouling factor depends upon the

Suspended solids in the fluid
Characteristic of process fluid
Velocity of process fluid containing suspended solids
All of these

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Process Equipment and Plant Design
The minimum tray spacing in distillation column of diameter less than 3 ft is normally __________ inches.

34
18
24
6

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