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Process Equipment and Plant Design

Process Equipment and Plant Design
In the downcomer of a distillation column, the minimum recommended residence time is about __________ seconds.

5
2.5
17.5
12.5

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Process Equipment and Plant Design
Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is

More or less depending upon the pressure & temperature inside the vessel and the nature of the fluid contained therein
More
Same
Less

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Process Equipment and Plant Design
Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if

Plain carbon steel and cast iron parts are used
Both B & C
Material of construction is high alloy steel
Wall thickness is > 30 mm

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Process Equipment and Plant Design
Factor of safety (i.e., overdesign factor) in heat transfer equipments is about __________ percent more than the actual/theoretical design factor.

30-35
35-40
15-20
43961

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Process Equipment and Plant Design
To avoid the tearing off the plate of an edge, the margin (i.e., the minimum distance from the centre of the rivet hole to the nearest edge of the plate) should be equal to

D
2.5 d
1.5 d
0.5 d

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Process Equipment and Plant Design
In the agitators, the power required will be changed with the increase of diameter of agitator (D) as

D²
D⁵
D⁹
D

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