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Mass Transfer

Mass Transfer
Gaseous diffusivity at atmospheric pressure is of the order of __________ cm²/second.

1 to 5
> 10
1
5 to 10

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Mass Transfer
It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).

94 min
51 min
71 min
15 min

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Mass Transfer
In the desorption of highly soluble gas from the liquid, the main resistance will be in the __________ phase.

Neither A nor B
Liquid
Both A & B
Gas

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Mass Transfer
Absorption accompanied with chemical reaction is exemplified by the absorption of

Ammonia in water
All of these
SO₂ in alkaline solution
Benzol present in coke oven gas by wash oil

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

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Mass Transfer
Capacity of a rotary dryer depends on its

Inclination with ground surface
Both Inclination with ground surface & R.p.m
R.p.m
None of the listed here

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