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Mass Transfer

Mass Transfer
Prandtl number for water at 20°C is about

150
0.7
7
70

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Mass Transfer
The diffusivity (D) in a binary gas mixture is related to the pressure (P) as

D ∝ P0.5
D ∝ 1/P0.5
D ∝ 1/P
D ∝ 1/P1.5

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Mass Transfer
Rose oil is extracted from rose leaves using __________ distillation.

Steam
Low pressure
High pressure
Extractive

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Mass Transfer
At 750°K and 1 atm, the approximate value of Schmidt number for air is

1
0.1
0.01
10

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Mass Transfer
Which of the following has the same dimension as mass diffusivity?

Both Momentum flux & Kinematic viscosity
Momentum flux
Kinematic viscosity
Thermal diffusivity

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Mass Transfer
Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a

Higher dew point
Higher wet bulb temperature
Higher absolute (specific) humidity
Higher relative humidity

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