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Mass Transfer

Mass Transfer
Diameter to height ratio for a rashig ring is

0.5
1
5
2

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Mass Transfer
Mass transfer co-efficient varies as DAB0.5, according to the __________ theory.

Film
Penetration
Surface renewal
None of these

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Mass Transfer
As per Gilliland's equation, the diffusivity is

Directly proportional to 'T1.5'
Dependent on the molecular volume & molecular weight of components
All of these
Inversely proportional to 'P'

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Mass Transfer
The cooling effect in a cooling tower can be speeded up by

Reducing the humidity of the air
All of the listed here
Increasing the air velocity and area of exposed wet surface
Reducing the barometric pressure

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Mass Transfer
Which of the following is considered equivalent to one theoretical stage in Mc-Cabe Thiele's method?

Both B and C
Reboiler
Total condenser
Partial condenser

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Mass Transfer
The Schmidt number which is defined as, μ/ρ D, is the ratio of the

Momentum diffusivity to the mass dif-fusivity
Momentum diffusivity to the thermal diffusivity
None of these
Thermal diffusivity to the mass diffusivity

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