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

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Process Equipment and Plant Design
Value of Peclet number = 0, is the representative of

Plug flow
Complete back mixing
Eddy diffusivity = 0
Laminar flow

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Process Equipment and Plant Design
The wall thickness of thin cylindrical shell with hemispherical ends is __________ that of the spherical ends.

Either B or C; depends on maximum permissible internal pressure
Equal to
Less than
More than

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Process Equipment and Plant Design
In chemical process equipments, the conical bottom heads used, usually has an apex angle of

80°
60°
20°
40°

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Process Equipment and Plant Design
Liquid gradient over the tray results due to the

Large reflux ratio
Large plate spacing
Resistance offered to flow of liquids by caps & risers and the flow of gas
Low gas velocity

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Process Equipment and Plant Design
for couplings and unions would be

350
Negligible
60
200

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