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Process Equipment and Plant Design

Process Equipment and Plant Design
Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin's formula as

D = 1.1 t
D = 1.6 √t
D = 1.5 t
D = 3√t

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Process Equipment and Plant Design
Generally, as the length of the liquid path on a tray is increased beyond 5 ft, the overall column efficiency

Decreases
Remains same
May increase or decrease depending upon the plate spacing
Increases

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Process Equipment and Plant Design
Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about __________ mm Hg (referred to a 760 mm mercury barometer).

750
650
250
450

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Process Equipment and Plant Design
The ideal size of round bubble caps to be used in industrial distillation column having a diameter of 3-6 metres is __________ cms.

7.5
50
5
15

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Process Equipment and Plant Design
Accidents in chemical plants are mostly due to

Faulty operating procedures
Improper layout of the equipments
Inadequate equipment design
Failure of equipments

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Process Equipment and Plant Design
Circumferential (hoop) stress in a thin cylindrical vessel under internal pressure is __________ the longitudinal stress.

Half
Eight times
Equal to
Twice

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