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Mass Transfer

Mass Transfer
When both the fluids flow concurrently in an absorber, the slope of the operating line is

1
-1
+ ve
- ve

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

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Mass Transfer
Rotary dryers cannot handle __________ materials.

Sticky
Dry
Free flowing
Grannular

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Mass Transfer
The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same sytem is

100
5
10
1

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Mass Transfer
The unit of volumetric diffusivity is

Cm³/sec
Cm²/sec
Cm²/seC₂
Cm/sec

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Mass Transfer
Which of the following quantities need not be fixed before starting the design of a co-current absorber?

Flow rate of gas
None of the listed here
Heat gain or loss
Flow rate of entering liquid

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