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Process Equipment and Plant Design

Process Equipment and Plant Design
In a distillation column, the minimum residence time for liquid in the downspout is about __________ seconds.

1
8
180
80

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Process Equipment and Plant Design
The most common standard size of bubble caps used in industrial operation is

6" dia cap with 4" dia riser
8" dia cap with 1" dia riser
1" dia cap with 0.5" dia riser
4" dia cap with 8" dia riser

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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.

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

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Process Equipment and Plant Design
Generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than __________ mm.

20
5
30
10

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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
0.3 to 0.5
0.1 to 0.25
0.5 to 0.6

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Process Equipment and Plant Design
To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of

(1.2)3/2
(1.2)3/5
(1.2)5/3
(1.2)2/3

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