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Process Equipment and Plant Design

Process Equipment and Plant Design
Which of the following lengths of heat exchanger tubes are normally not used in practice?

10 metres
6 metres
2.5 metres
0.5 metre

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Process Equipment and Plant Design
Which tube arrangement in a heat exchanger would facilitate highest heat transfer rate?

Square pitch
Heat transfer rate is independent of tube arrangement
Triangular pitch
Diagonal square pitch

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Process Equipment and Plant Design
In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the

Lower skirt clearance
Lower static submergence
Small downcomer liquid seal
Liquid gradient on the tray

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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.

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

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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.

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

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Process Equipment and Plant Design
Multiple blade paddle agitator is used for mixing high viscosity liquids/paste in which the paddle diameter is commonly 0.8 times the tank diameter. However, the width of the blade is in the range of __________ times the paddle diameter.

0.65 to 0.80
0.5 to 0.6
0.3 to 0.5
0.1 to 0.25

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