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Process Equipment and Plant Design

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

34
6
24
18

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Process Equipment and Plant Design
__________ closure is the weakest enclosure for cylindrical vessels.

Hemispherical
Torispherical
Elliptical
Conical or flat plate

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Process Equipment and Plant Design
Le/D for fully open gate valves would be

Both B and C
Much more than that for fully open globe valves
Around 7
Much less (say 2% than that for fully open globe valves)

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Process Equipment and Plant Design
The shell side pressure drop in a shell and tube heat exchanger is maximum for __________ baffle.

Segmental
Independent of the type of
Orifice
Disk and ring

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Process Equipment and Plant Design
Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as 'd' will be

√d
√(2πd)
√(2d)
D

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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

1.5-2.5
3.5-5.5
44119
7.5-10.0

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