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Process Equipment and Plant Design

Process Equipment and Plant Design
Le/D for a Tee (used as elbow, entering run) would be around

200
350
5
60

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Process Equipment and Plant Design
The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about __________ mm of water column per metre height of packing.

20-40
1000-1500
43835
100-150

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Process Equipment and Plant Design
At the following point for a given packing and set of fluids, the pressure drop per metre of packed height, with variation in fluid rates and operating pressure

Decreases
Remains same
May increase or decrease depending upon the solubility of the gas in the liquid
Increases

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

Raschig rings
All of these
Lessig rings
Cross-partition rings

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Process Equipment and Plant Design
Pressure drop due to pipe fittings can be estimated by the equation, ΔP/p = 4f.Le/D.V2/2gc, where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of Le/D (dimensionless) for 45° elbow and 180° close return bends would be respectively around

180 and 300
5 and 10
45 and 75
300 and 500

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Process Equipment and Plant Design
If a single tube pass heat exchanger is converted to two passes; for the same flow rate, the pressure drop per unit length in tube side will __________ times.

None of these
Decrease by 22
Increase by 1.8
Increase by 21.6

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