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Mass Transfer

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

1
10
0.01
0.1

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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
0.25
0.0025
2.5

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Mass Transfer
To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate)

Increase 'S' and decrease 'G'
Decrease both 'G' and 'S'
Increase 'G' and decrease 'S'
Increase both 'G' and 'S'

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Mass Transfer
Pressure drop through plate tower as compared to that through packed tower, for the same duty will be

More
Less
Equal
Either A or B; depends on the packing height

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Mass Transfer
Very tall packed towers are divided into series of beds to

Avoid channelling
Reduce liquid hold-up
Avoid flooding
Reduce the overall pressure drop

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Mass Transfer
Dry bulb temperature of unsaturated air is more than its __________ temperature.

Both A & B
Dew point
Wet bulb
Neither A nor B

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