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Mass Transfer MCQs

Chemical Engineering Objective Questions

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470. Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maximum equilibrium moisture?
A. Anthracite coal
B. Rag paper
C. Bamboo
D. Inorganic solids
Discussion
471. To remove all the moisture from a wet solid it requires exposure to __________ air.
A. Perfectly dry
B. Highly humid
C. High temperature
D. None of these
Discussion
472. Which of the following liquid-vapor contacting devices provides maximum contact surface area for a particular duty?
A. Sieve plate column
B. Bubble cap column
C. Randomly packed column
D. Wetted wall column
Discussion
473. Components, having widely different boiling point in a binary mixture, can be separated using __________ distillation.
A. Molecular
B. Extractive
C. Steam
D. Simple
Discussion
474. When the psychometric ratio is __________ then the adiabatic saturation temperature and wet bulb temperature becomes equal.
A. 1
B. < 1
C. > 1
D. $$\infty $$
Discussion
475. Which is the controlling factor for a drum drier?
A. Diffusion
B. Heat transfer
C. Both A & B
D. Neither A nor B
Discussion
476. Sand is dried in foundaries in a___drier.
A. Rotary
B. Fluidisedbed
C. Vacuum
D. Spray
Discussion

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