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Mass Transfer

Mass Transfer
The unit of volumetric diffusivity is

Cm²/sec
Cm³/sec
Cm/sec
Cm²/seC₂

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Mass Transfer
Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are

8
1
9
10

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Mass Transfer
__________ temperature is the steady state temperature attained by a small amount of liquid evaporating into a large quantity of unsaturated gas-vapor mixture.

Dew point
None of these
Dry bulb
Wet bulb

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Mass Transfer
A slurry is to be dried to produce flaky solid. Which dryer would you recommend?

Spray dryer
Drum dryer
Rotary dryer
Dielectric dryer

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Mass Transfer
The absorption factor is defined as (where, L = liquid flow rate, G = gas flow rate and, m = slope of the equilibrium line)

ML/G
G/mL
L/mG
LG/m

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Mass Transfer
Reverse osmosis is also called

Electrodilysis
Diffusion
Dialysis
Ultrafiltration

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