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Process Equipment and Plant Design

Process Equipment and Plant Design
What is the slope of the operating line in the rectifying section of a distillation coloumn?

∞
> 1

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Process Equipment and Plant Design
Back-trapping in a distillation column results due to

Low gas velocity
Excessive liquid gradient over the tray
Low reflux ratio
High gas velocity

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Process Equipment and Plant Design
Which of the following efficiencies can be greater than 100%?

Murphree plate efficiency
None of these
Overall plate efficiency
Point efficiency

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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

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

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

17.5
2.5
12.5
5

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Process Equipment and Plant Design
The wall thickness of thin cylindrical shell with hemispherical ends is __________ that of the spherical ends.

Equal to
More than
Either B or C; depends on maximum permissible internal pressure
Less than

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