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Process Equipment and Plant Design

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

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

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Process Equipment and Plant Design
A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of

None of these
2
20.2
20.8

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Process Equipment and Plant Design
Optimum reflux ratio in a continuous distillation column is determined by the

Maximum permissible vapour velocity
Total cost consideration (fixed cost of the column plus the cooling water & steam cost)
Flooding limit of the column
None of these

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Process Equipment and Plant Design
Thin spherical shells subjected to internal pressure, develop __________ stresses.

Neither A nor B
Radial
Circumferential
Both A & B

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Process Equipment and Plant Design
In case of bubble cap distillation column of diameter greater than 1.2 metres, the cap diameter is roughly about __________ cms.

10
20
30
35

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Process Equipment and Plant Design
The wall thickness for a large high pressure pipeline is determined by the consideration of the

Axial tensile stress in the pipe
Circumferential pipewall tension
Forces exerted by static and dynamic action at bends
Temperature stresses

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