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Mass Transfer

Mass Transfer
In paper industry, paper is dried in a __________ dryer.

Festoon
Heated cylinder
Tunnel
Conveyor

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Mass Transfer
The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m²/m³)

50
100
1000
500

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Mass Transfer
Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be

Humidified
Cooled
Both A & B
Dehumidified

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Mass Transfer
Drying operation under vacuum is carried out to

Dry those materials which have very high unbound mositure content
Dry materials having high bound moisture content
Reduce drying temperature
Increase drying temperature

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Mass Transfer
Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the __________ number.

Sherwood
Schmidt
Peclet
Stanton

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Mass Transfer
Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty?

Perforated tray tower
Grid tray tower
Wetted wall tower
Bubble cap tower

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