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Process Equipment and Plant Design

Process Equipment and Plant Design
Which of the following packing materials provides for maximum mass transfer?

Raschig rings
All of these
Cross-partition rings
Lessig rings

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Process Equipment and Plant Design
For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by

Di, opt = 3 Q0.36 . ρ1.86 μ0.08
Di, opt = 3.9 Q0.45 . ρ0.23
Di, opt = 3 Q0.36 ρ0.18
Di, opt = 7.6 Q0.36 . ρ0.9

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Process Equipment and Plant Design
In the downcomer of a distillation column, the minimum recommended residence time is about __________ seconds.

12.5
2.5
5
17.5

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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 arithmetic mean value
Less than arithmetic mean value
More than geometric mean value

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Process Equipment and Plant Design
Liquid gradient over the tray results due to the

Resistance offered to flow of liquids by caps & risers and the flow of gas
Low gas velocity
Large reflux ratio
Large plate spacing

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Process Equipment and Plant Design
Speed of industrial paddle agitator ranges from __________ rpm.

1000 to 2000
20 to 100
1 to 5
500 to 750

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