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Process Equipment and Plant Design

Process Equipment and Plant Design
Larger depth of liquid on the trays of a distillation column

Leads to high tray efficiency
Neither A nor B
Results in higher pressure drop per tray
Both A & B

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

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

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Process Equipment and Plant Design
Angled baffles are preferred in the agitation tank to control the swirling action; if the viscosity of the liquid to be mixed is about 200 poise. However, the baffle may be completely eliminated for mixing liquids having viscoisty above __________ poise.

300
1500
600
1000

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Process Equipment and Plant Design
In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube)

4(P² - πd²/4)/πd
4P²/πd
(P² - πd²/4)/πd
Πd/4P²

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Process Equipment and Plant Design
Tube side heat transfer co-efficient for turbulent flow of liquid through tubes is proportional to

G1.5
G0.2
G0.5
G0.8

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Process Equipment and Plant Design
Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as 'd' will be

D
√(2πd)
√d
√(2d)

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