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Mass Transfer

Mass Transfer
The suitable evaporator for concentration of foaming liquids is a __________ evaporator.

Long tube
Vacuum
Short tube
Falling film

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Mass Transfer
A mixture of 10% C₆H₆ vapour in air at 25°C and 750 mm Hg has a dew point of 20°C. Its dew point at 30°C and 700 mm Hg will be around __________ °C.

27.3
18.7
20
21.7

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Mass Transfer
In McCabe-Thiele method, at infinite reflux ratio

Neither A nor B
Both A & B
The overhead product is minimum
Both the operating lines coincide with diagonal

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Mass Transfer
Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the __________ moisture.

None of these
Unbound
Bound
Critical

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Mass Transfer
Lewis number (Le) is

Pr x St
St x Sh
Sh x Pr
Sc x Pr

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Mass Transfer
As the reflux ratio increases, the slope of the operating line for rectifying section

Data insufficient, cannot be predicted
Decreases
Increases
Remains constant

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