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February 2019

In case of absorption with exothermic reaction, for fluids having ___________________?

Mass Transfer /
In case of absorption with exothermic reaction, for fluids having ___________________?

A. Pr = Sc; percentage change in heat and mass transfer flux will be the same for a given change
in the degree of turbulence
B. Pr = Sc = 1; total mass, momentum and thermal diffusivity will be the same
C. Both A. and B.
D. Pr = Sc; there won’t be any change in heat and mass transfer flux with changes in degree of
turbulence

In case of absorption with exothermic reaction, for fluids having ___________________? Read More »

Mass Transfer

At equilibrium the concentration of water in vapour phase (C*) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is_________________?

Mass Transfer /
At equilibrium the concentration of water in vapour phase (C*) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is_________________?

A. 0.0
B. 0.2
C. 0.4
D. 1.0

At equilibrium the concentration of water in vapour phase (C*) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is_________________? Read More »

Mass Transfer

The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are __________________?

Mass Transfer /
The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are __________________?

A. Parallel
B. Straight
C. Both parallel and straight
D. Neither parallel nor straight

The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are __________________? Read More »

Mass Transfer

Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in ____________________?

Mass Transfer /
Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in ____________________?

A. Viscosity with concentration
B. Degree of ideality of the solution
C. Both A. and B.
D. Neither A. nor B.

Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in ____________________? Read More »

Mass Transfer