1. The slope of 9-line is determined by the
Reflux ratio
Plate efficiency to be achieved
Thermal condition of the feed
Relative volatility
✅ The correct answer is option C.
Mass Transfer MCQs
2. The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the
Temperature rises
Pressure rises
Temperature falls
Pressure falls
✅ The correct answer is option A.
3. When an unsaturated air-water mixture is heated at constant pressure, then
The partial pressure of water vapour increases
The specific humidity decreases
The relative humidity increases
The relative humidity decreases
✅ The correct answer is option D.
4. Batch tray dryers suffers from the disadvantage of
High maintenance cost
Non-uniform & low production rate
High labour cost & low heat economy
All of the above
✅ The correct answer is option C.
5. The McCabe Δ L law states that the
Molar heats of vaporisation of components are nearly equal
Linear crystal growth rate depends on the degree of supersaturation
Linear crystal growth rate does not depend on the crystal size
Linear crystal growth rate depends on the crystal size
✅ The correct answer is option C.
6. If a two phase system is in physical equilibrium; then it means that, the
Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase
Temperature of the liquid phase is equal to that of the vapor phase
Total pressure throughout the liquid phase is equal to that throughout the vapor phase
All of the above
✅ The correct answer is option D.
7. As per Gilliland’s equation, the diffusivity is
Directly proportional to ‘T1.5’
Inversely proportional to ‘P’
Dependent on the molecular volume & molecular weight of components
All of the above
✅ The correct answer is option D.
8. Molecular seives are porous
Alumina
Silica
Synthetic zeolites crystals/metal alumino-silicates
None of these
✅ The correct answer is option C.
9. Which of the following is used for the concentration of rubber latex?
Agitated film evaporator
Long tube vertical evaporator
Short tube evaporator
Calendria
✅ The correct answer is option A.
10. In a counter-current extractor, as the axial mixing increases, the extraction efficiency
Increases
Decreases
Remains unchanged
Depends on the pressure of the system
✅ The correct answer is option B.