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Process Equipment and Plant Design

Process Equipment and Plant Design
In a distillation column, the minimum residence time for liquid in the downspout is about __________ seconds.

1
180
80
8

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Process Equipment and Plant Design
Liquid redistribution should be done in a packed tower packed with raschig rings every 6 metres or __________ times the column diameter, whichever is lower.

2.5-3.0
10-12.5
5-7.5
15-20

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Process Equipment and Plant Design
Which of the following factors affect the pressure drop in a co-current gas-liquid absorption packed tower?

All of these
Fluid flow rates
Size, shape, orientation and surface of the packing particles
Density and viscosity of fluids

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Process Equipment and Plant Design
__________ liquor is best handled in a long tube vertical evaporator.

Viscous
Foamy
Salting
Scaling

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Process Equipment and Plant Design
Le/D for fully open gate valves would be

Much more than that for fully open globe valves
Much less (say 2% than that for fully open globe valves)
Around 7
Both B and C

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Process Equipment and Plant Design
Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?

Sorel-Lewis method
Ponchon-Savarit method
McCabe-Thiele's method
None of these

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