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.Management Sciences
Category: Mass Transfer
Leaching of sugar from sugar beets is done by___________________?
A. Hot water
B. Hexane
C. Dilute H2SO4
D. Lime water
It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%) ?
A. 15 min
B. 51 min
C. 71 min
D. 94 min
If the amount of the steam used in steam distillation is increased, the temperature of distillation__________________?
A. Increases
B. Decreases
C. Remains unchanged
D. Depends on relative volatility
For an absorber, both equilibrium and operating line will be straight for _______________________?
A. Concentrated solution and non-isothermal operation
B. Dilute solution and non-isothermal operation
C. Dilute solution and isothermal operation
D. Concentrated solution and isothermal operation
A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is___________________?
A. 0.54
B. 1.04
C. 1.24
D. 1.94
Fenske equation determines the __________________?
A. Maximum number of ideal plates
B. Height of the distillation column
C. Minimum number of theoretical plates
D. Optimum reflux ratio
Mass transfer co-efficient (K) and diffusivity D. are related according to film theory as______________________?
A. K ∝ D
B. K ∝√D
C. K ∝ D1.5
D. K ∝ D2
The main reason for dividing a tall packed tower into series of small towers is to________________________?
A. Minimise the overall pressure drop
B. Avoid flooding
C. Reduce liquid hold up
D. Avoid channelling
The dimension of diffusivity is same as that of the__________________?
The dimension of diffusivity is same as that of the
A. Density
B. Molal concentration
C. Kinematic viscosity
D. Velocity head
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