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Mass Transfer

Mass Transfer
A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.

44119
30-40
90-100
70-80

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Mass Transfer
Mass transfer co-efficient of liquid is

Affected more by temperature than that for gases
Affected much less by temperature than that for gases
None of these
Not affected by the temperature

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Mass Transfer
When an unsaturated air-water mixture is heated at constant pressure, then

The partial pressure of water vapour increases
The relative humidity decreases
The relative humidity increases
The specific humidity decreases

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Mass Transfer
In liquid-liquid extraction, the number of phases at plait point is

3
4
2
1

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Mass Transfer
In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________ its relative saturation.

Lower than
Higher than
Equal to
Either A or B, depends on the mixture composition

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

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