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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.

90-100
44119
70-80
30-40

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Mass Transfer
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)

(4De/πt)1/2
(4De/t)
(De.t)1/2
(De/t)1/2

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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.

0.0025
0.25
1.25
2.5

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Mass Transfer
Which of the following decreases during evaporative cooling process with recirculated water supply?

None of these
Wet bulb temperature
Relative humidity
Partial pressure of vapour

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Mass Transfer
On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in

Greater degree of separation with a fixed number of trays
None of these
Increased reboiler load
Increased reflux ratio

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Mass Transfer
The apex of an equilateral-triangular coordinate (in ternary liquid system) represents a/an

Binary mixture
Insoluble binary system
Pure component
Ternary mixture

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