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Mass Transfer

Mass Transfer
Calcium ammonium nitrate (a fertiliser) is dried in a __________ dryer.

Vacuum
Tray
Tunnel
Rotary

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Mass Transfer
The surface renewal frequency in Danckwerts model of mass transfer is given by (KL: mass transfer co-efficient)

√(KL².DA)
KL².DA
KL²/DA
KL/DA²

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Mass Transfer
Azeotropism for ethyl alcohol-water system disappears by

Decreasing pressure
No means
Increasing pressure
Increasing temperature

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Mass Transfer
Leaching of coffee from coffee beans is done by

Dilute H₂SO₄ (hot)
Lime water
Hexane
Hot water

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Mass Transfer
Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1°F is called the

Sensible heat
Specific heat
Latent heat
Humid heat

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Mass Transfer
During constant rate period, the rate of drying decreases with the

Decrease in air temperature
Increase in air humidity
Neither A nor B
Both A & B

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