591. Powdery materials can be guarded against caking tendency on storage by
Providing irregular grain size
Providing minimum percentage of voids
Having maximum possible points of contact
None of these
✅ The correct answer is option D.
Mass Transfer MCQs
592. One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult’s law is obeyed, then changing the feed composition would effect
The product composition but not the fraction vaporised
The product composition as well as the fraction vaporised
The fraction vaporised but not the product composition
Neither the product composition nor the fraction vaporised
✅ The correct answer is option C.
593. __________ column is the most suitable for achieving the best performance for mass transfer operations involving liquid with dispersed solids.
Watted wall
Packed
Plate
Spray
✅ The correct answer is option C.
594. Which of the following is directly concerned with psychrometry?
Lewis reltionship
Galileo number
Weber number
Dean number
✅ The correct answer is option A.
595. Absorption factor, for a fixed degree of absorption from a fixed amount of gas should be
1
> 1
< 1
≤ 1
✅ The correct answer is option B.
596. With increase in temperature, the solubility of gases in liquids, at fixed pressure
Increases
Decreases
Remains same
Either A or B, depends on the system
✅ The correct answer is option B.
597. With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop
Decreases
Remains unchanged
Increases
Decreases exponentially
✅ The correct answer is option C.
598. Pick out the wrong statement. Generally for physical adsorption, a gas of
Higher molecular weight is adsorbed in preference to a gas of low molecular weight
High critical temperature is adsorbed in preference to a gas of low critical temperature
Low volatility is adsorbed in preference to a gas of high volatility
None of these
✅ The correct answer is option D.
599. Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation?
Cost
Availability
Toxicity
Selectivity
✅ The correct answer is option D.
600. Out of two equilibrium curves, first one lies above the diagonal and the second lies below the diagonal in the x-y plot. It means that separation by distillation is
Not possible in the second case unless vacuum is applied
Not possible in the second case unless high pressure is applied
More readily done in the second case compared to first one
None of these
✅ The correct answer is option C.