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Mass Transfer

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

Festoon
Heated cylinder
Conveyor
Tunnel

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Mass Transfer
Dry bulb temperature of the gas is __________ the wet bulb temperature.

Equal to
More than
Less than
None of these

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Mass Transfer
During constant rate drying period, vaporisation rate per unit drying surface area

Decreases with time
Does not affect the moisture content of the wet solid
Does not change with time
Increases with time

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Mass Transfer
The operating cost of a distillation column at minimum reflux ratio is

Minimum
Maximum
Zero
Infinite

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Mass Transfer
H₂S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H₂S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is

2
0.56
1.56
1

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Mass Transfer
Absorption accompanied by heat evolution results in

Decrease in equilibrium solubility
Increased capacity of the absorber
None of these
Increase in equilibrium solubility

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