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

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

1
80
8
180

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Process Equipment and Plant Design
Smaller sized packings are generally dumped to the packed columns, and the large ones of size greater than __________ mm are stacked individually, which provides better control over bed porosity and offers lower gas pressure drop.

150
25
75
50

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Process Equipment and Plant Design
Elastic failure of a material occurs, when the tensile stress equals yield strength, yield point or the elastic limit. Also, the elastic failure occurs according to maximum strain theory, when the maximum tensile strain equals (where, σ = yield strength and E = modulus of elasticity)

E
E/σ
Σ
Σ/E

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Process Equipment and Plant Design
Fouling factor must be included in the calculation of over all design heat transfer coefficient, when the liquid

Is of high specific gravity
Containing suspended solids flows at low velocity
Containing suspended solids flows at high velocity
Is highly viscous

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

Complete back mixing
Laminar flow
Eddy diffusivity = 0
Plug flow

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