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Process Equipment and Plant Design

Process Equipment and Plant Design
The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is

< 7
> 7 < 15
> 20 < 50
< 30

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Process Equipment and Plant Design
__________ of water makes it a widely used coolant in heat exchangers.

Low viscosity
Low corrosiveness
High specific heat
Low dirt factor

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

Plug flow
Complete back mixing
Laminar flow
Eddy diffusivity = 0

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Process Equipment and Plant Design
In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D₁ and D₂ are I.D. of inner and outer pipes)

D₂ - D₁
(D₂² - D₁²)/D₂²
None of these
(D₂² - D₁²)/D₁²

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Process Equipment and Plant Design
Excessive liquid gradient on a tray may result in the

Maldistribution of gas
Gas blowing beneath cap skit
Back trapping
All of these

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Process Equipment and Plant Design
for couplings and unions would be

Negligible
200
60
350

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