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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
- ve
+ ve
1

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Mass Transfer
Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C?

Humidification only
Both heating and humidification
Heating only
Evaporative cooling

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

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Mass Transfer
In distillation column design, the McCabe-Thiele procedure is inadequate and a Ponchan-Savarit procedure is needed, when

A total condenser is used
The latent heat of vaporisation of the more and less volatile components are greatly different
An azeotrope forms
Saturated feed is not used

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Mass Transfer
Can a cooling tower cool water below the wet bulb temperature of inlet air?

No
Yes ; but the air flow rate should be excessively high
Yes ; but height of cooling tower will be prohibitively high
Yes

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Mass Transfer
In case of an ideal solution, the total vapor pressure varies __________ with the composition expressed as mole fraction,

Linearly
Exponentially
Inversely
None of these

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