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.Management Sciences
Category: Mass Transfer
During constant rate period, the rate of drying decreases with the______________________?
A. Decrease in air temperature
B. Increase in air humidity
C. Both A. and B.
D. Neither A. nor B.
The binary diffusivity in gases does not depend upon the ___________________?
A. Pressure
B. Temperature
C. Nature of the components
D. None of these
For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is___________________?
A. Calculated
B. Unknown
C. Known
D. Not required
Which is not concerned directly with mass transfer ?
A. Schmidt number
B. Sherwood number
C. Lewis relationship
D. Froude number
Steady state equimolal counter diffusion is encountered in_____________________?
A. Separation of a binary mixture by distillation
B. Absorption of NH3 from air by water
C. All liquid-liquid diffusion systems
D. All liquid-solid diffusion systems
Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C ?
A. Humidification only
B. Heating only
C. Both heating and humidification
D. Evaporative cooling
In a liquid-liquid extraction, 10 kg of a solution containing 2 kg of solute C and 8 kg of solvent A is brought into contact with 10 kg of solvent B. Solvent A and B are completely immiscible in each other whereas solute C is soluble in both the solvents. The extraction process attains equilibrium. The equilibrium relationship between the two phases is Y* = 0.9X, where Y* is the kg of C/kg of B and X is kg of C/kg of A. Choose the correct answer?
A. The entire amount of C is transferred to solvent B
B. Less than 2 kg but more than 1 kg of C is transferred to solvent B
C. Less than 1 kg of C is transferred to B
D. No amount of C is transferred to B
In case of an absorber, the operating _______________?
A. Line always lies above the equilibrium curve
B. Line always lies below the equilibrium curve
C. Line can be either above or below the equilibrium curve
D. Velocity is more than the loading velocity
The mass transfer co-efficient for a solid sphere of radius ‘a’ dissolving in a large volume of quiescent liquid, in which „D’ is the diffusivity of solute, is _____________________?
A. D/a
B. D/2a
C. Proportional to √D
D. Dependent on the Reynolds number
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