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Process Equipment and Plant Design

Process Equipment and Plant Design
The retention time of material in a rotary dryer depends upon its

Rpm
All of these
Flights arrangement
Slope & length

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

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

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Process Equipment and Plant Design
Poisson's ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poisson's ratio for structural and pressure vessel steel may be taken as

0.3
0.01
0.75
0.95

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Process Equipment and Plant Design
In a shell and tube heat exchanger, the shortest centre to centre distance between the adjacent tubes is

Called tube clearance
None of these
Always less than the diameter of the tube
Called tube pitch

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Process Equipment and Plant Design
Scale up problem in design based on the similarity concept takes into account __________ similarity.

Geometrical
All of these
Kinematic
Dynamic

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Process Equipment and Plant Design
Height of the flights in the rotary drier is in the range of

0.5 to 0.6 d
0.2 to 0.5 d
0.02 to 0.05 d
0.08 to 0.12 d

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