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Process Equipment and Plant Design

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
1.6 to 2
2.2 to 2.6
1.1 to 1.5

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Process Equipment and Plant Design
The dust collection efficiency of electrostatic precipitator increases with increase in the

Gas flow rate
Both A & B
Neither A nor B
Electrode area

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Process Equipment and Plant Design
Maximum plate efficiency is achieved in case of __________ flow.

Split
Cross
Cascade
Reverse

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Process Equipment and Plant Design
Ratio of tube length to shell diameter for a shell and tube heat exchanger is

4 : 1 to 8 : 1 for liquid-liquid exchanger
< 4 : 1 for gas-gas exchangers
8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers
Both B & C

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Process Equipment and Plant Design
The value of fouling factor depends upon the

All of these
Suspended solids in the fluid
Characteristic of process fluid
Velocity of process fluid containing suspended solids

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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

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

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