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Process Equipment and Plant Design

Process Equipment and Plant Design
Friction factor for turbulent flow in a new pipe is given by

f = 25/NRe
f = 0.04/NRe0.16
f = 16/NRe
f = 0.22 NRe0.05

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Process Equipment and Plant Design
Optimum reflux ratio in a continuous distillation column is determined by the

Maximum permissible vapour velocity
None of these
Total cost consideration (fixed cost of the column plus the cooling water & steam cost)
Flooding limit of the column

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Process Equipment and Plant Design
Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally __________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8").

1.5 times
Three fourth
Equal to
Half

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Process Equipment and Plant Design
Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is

More
Same
Twice
Less

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Process Equipment and Plant Design
The approximate liquid depth in an agitation tank is equal to (where, d = tank diameter)

0.5 d
0.75 d
2 d
D

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Process Equipment and Plant Design
In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of __________ mm.

44183
43895
44058
43962

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