Mass Transfer

111.Decoction refers to the use of solvent

1. At ambient temperature
2. At its boiling point
3. In its vapor form
4. None of these

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112.Degree of freedom for leaching and solvent extraction process is

1. 0
2. 1
3. 2
4. 3

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113.Design calculation for multiple component distillation is done by

1. Ponchon-Savarit method
2. McCabe-Thiele method
3. Enthalpy concentration method
4. Tray to tray calculations

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114.Desirable value of absorption factor in an absorber is

1. 1
2. < 1
3. > 1
4. 0.5

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115.Desulphurisation of petrol is done in a

1. Bollman extractor
2. Rotating disc extractor
3. Packed extraction column
4. Plate type extraction column

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116.Detergent solution is dried to a powder in a

1. Spray dryer
2. Spouted bed dryer
3. Tunnel dryer
4. Pan open to atmosphere

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117.Dew point of a gas-vapour mixture

1. Increases with temperature rise
2. Decreases with temperature rise
3. Decreases with decrease in pressure
4. Increases with increase in pressure

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118.Dew point of an air-water vapor mixture

1. Decreases with decrease in pressure
2. At constant humidity & total pressure is fixed
3. Corresponding to any point on the humidity chart is obtained by projecting a line through this point parallel to the temperature axis and to the saturation curve
4. All 'a', 'b' & 'c'

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119.Diameter of raschig rings used in packed tower in industry is normally around _________ inches.

1. 2
2. 8
3. 12
4. 18

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120.Diameter to height ratio for a raschig ring is

1. 1
2. 0.5
3. 2
4. 8

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