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Process Equipment and Plant Design

Process Equipment and Plant Design
The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from

3 to 5
4 to 8
2 to 3
6 to 12

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Process Equipment and Plant Design
In a continuous distillation column, the optimum reflux ratio ranges from __________ times the minimum reflux ratio.

2.7 to 3
1.1 to 1.5
1.6 to 2
2.2 to 2.6

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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

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

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Process Equipment and Plant Design
Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effect in evaporation

Increases capacity
Does not affect the capacity
Increases economy
Both B & C

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Process Equipment and Plant Design
In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for

Fixing the tubes
Reducing scale deposition
Increasing pressure drop
Creating turbulence

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Process Equipment and Plant Design
Maximum acceptable total liquid gradient over a tray is about __________ mm.

30.5
45.5
5.5
12.5

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