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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

1.5-2.5
44119
7.5-10.0
3.5-5.5

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Process Equipment and Plant Design
Le/D for a Tee (used as elbow, entering run) would be around

60
5
200
350

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Process Equipment and Plant Design
For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is

(d1 + d2)/d2
D2/(d1 + d2)
D1/(d1 + d2)
(d1 + d2)/d1

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Process Equipment and Plant Design
Hold up of material in a operating rotary drier is in the range of

0.05 to 0.15
0.8 to 0.9
0.25 to 0.50
0.5 to 0.8

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Process Equipment and Plant Design
The diameter of a propeller agitator used in agitation tank ranges from __________ percent of the tank diameter and its peripherial speed is normally 300 to 500 metres/minute.

15 to 30
40 to 50
5 to 10
55 to 75

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Process Equipment and Plant Design
Of the pressure vessels, with same thickness but different diameters, which one withstands higher pressure?

Larger dia long vessel
Strength of the vessel is same irrespective of the diameter
Larger dia vessel
Smaller dia vessel

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