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Mass Transfer

Mass Transfer
A good solvent used for absorption should not have very high

Viscosity
All of these
Vapor pressure
Freezing point

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Mass Transfer
The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if

NSc = NPr = NLe
NPr = NLe
NSc = 1
NSc = NLe

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Mass Transfer
Fenske equation determines the

Height of the distillation column
Minimum number of theoretical plates
Maximum number of ideal plates
Optimum reflux ratio

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Mass Transfer
Lewis number (Le) is

Pr x St
Sh x Pr
St x Sh
Sc x Pr

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Mass Transfer
In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the

Range is 15°F
Approach is 10°F
Neither A nor B
Both A & B

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Mass Transfer
Can a cooling tower cool water below the wet bulb temperature of inlet air?

Yes ; but the air flow rate should be excessively high
No
Yes ; but height of cooling tower will be prohibitively high
Yes

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