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.Management Sciences
Category: Mass Transfer
Berl saddle made of carbon cannot be used for ___________________?
A. Alkalis
B. SO2
C. H2SO4
D. Oxidising atmosphere
The rate of solid-liquid extraction is limited by the_________________?
A. Phase change of the solute as it dissolves in the solvent
B. Diffusion of the solute through the solvent in the pores to the outside of the particle
C. Diffusion of the solute from the solution in contact with the particle to the main bulk of the
solution
D. All A , B. & C.
In most of the vacuum crystalliser, vacuum is generally produced by means of a_____________________?
A. Suction pump
B. Compressed air jet
C. Steam jet ejector with a barometric condenser
D. None of these
Heat sensitive materials with very high latent heat of vaporisation may be economically separated using__________________?
A. Liquid extraction
B. Distillation
C. Evaporation
D. Absorption
During sensible cooling process ______________________?
A. Relative humidity decreases
B. Relative humidity increases
C. Wet bulb temperature decreases
D. Both B. and C.
Below is given an equilibrium moisture curve of a substance. State which regions represent free moisture and unbound moisture respectively ?
A. II, III
B. II, IV
C. IV, III
D. IV, II
If „f’ is defined as above, then which of the following applies to a feed at dew point ?
A. f = 1
B. f 1
D. 0 < f < 1
Agitator is provided in a crystalliser for____________________?
A. Avoiding deposition on cooler surfaces
B. Formation of nuclei
C. Crystal growth
D. All A., B. and C.
Experimental determination of _______________ is done by wetted wall column method?
A. Diffusion co-efficient
B. Mass transfer co-efficient
C. NTU
D. None of these
Only small amount of evaporation of water produces large cooling effects because of its___________________?
A. Large latent heat
B. Low viscosity
C. Small latent heat
D. None of these
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