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Mass Transfer

Mass Transfer
Wet bulb and dry bulb temperatures becomes identical at __________ percent saturation curve.

None of these
78
50
100

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Mass Transfer
If a₁ and a₂ are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement.

None of these
a₁ = 2a₂
a₁ = a₂
a₁ = 0.5 a₂

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Mass Transfer
Only small amount of evaporation of water produces large cooling effects because of its

Low viscosity
None of these
Small latent heat
Large latent heat

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Mass Transfer
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

> 1
< 1
1

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Mass Transfer
Total reflux in a distillation operation requires minimum

All of these
Number of plates
Condenser load
Reboiler load

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Mass Transfer
The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.

1.25
2.5
0.0025
0.25

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