0
1
< 1
> 1
✅ The correct answer is option B.
Chemical Engineering MCQs
In case of absorption with exothermic reaction, for fluids having
Pr = Sc; percentage change in heat and mass transfer flux will be the same for a given change in the degree of turbulence
Pr = Sc = 1; total mass, momentum and thermal diffusivity will be the same
Both A & B
Pr = Sc ; there won
✅ The correct answer is option C.
For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because
Water has a high latent heat of evaporation
Lewis number is close to unity
They are always equal under all circumstances
Solubility of the components of air in water is very small
✅ The correct answer is option A.
Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture?
Anthracite coal
Rag paper
Bamboo
Inorganic solids
✅ The correct answer is option C.
Raoult’s law applies to the
All liquid solutions
Non-ideal solution only
Non-volatile solute
Solvents
✅ The correct answer is option D.
Liquid diffusivity is of the order of __________ cm² /second.
0.01
0.1
10-5 to 10-6
> 1
✅ The correct answer is option C.
At the boiling point of the liquid at the prevailing pressure, the saturated absolute humidity becomes
1
0
∞
None of these
✅ The correct answer is option C.
Pick out the system with minimum boiling azeotrope at 1 atm.
Benzene-toluene
Ethyl alcohol-water
Hydrochloric acid-water
All of the above
✅ The correct answer is option B.
The relative volatility of a binary mixture at constant temperature __________ the total pressure.
Decreases with increase in
Increases with increase in
Is independent of
None of these
✅ The correct answer is option A.
Which of the following plays an important role in problems of simultaneous heat and mass transfer?
Lewis number
Schmidt number
Prandtl number
Sherwood number
✅ The correct answer is option A.