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Process Equipment and Plant Design

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.

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

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

Lessig rings
All of these
Cross-partition rings
Raschig rings

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Process Equipment and Plant Design
It is not desirable to design a heat exchanger for LMTD correction factor, FT, of less than

0.99
0.8
0.55
0.95

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Process Equipment and Plant Design
Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always

Both B & C
Less than arithmetic mean value
More than arithmetic mean value
More than geometric mean value

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Process Equipment and Plant Design
1.2 to 3.8 cms is the value of the

All of these
Skirt clearance for bubble caps
Static submergence in case of a bubble cap tray for column operating under pressure (≥ 1 atm.)
Downcomer liquid seal in case of a balanced tray design

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Process Equipment and Plant Design
Heat transfer co-efficient, hG(Kcal/hr.m² .°C) and mass velocity of air, G (kg/hr.m² ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to

0.0176G1.37
1.004G0.8
HG = 1.004G0.37
HG = 0.0176G0.37

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