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- Question
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the
Options- A. relative volatility is reasonably constant.
- B. mixture (to be separated) shows negative deviation from ideality.
- C. mixture (to be separated) shows positive deviation from ideality.
- D. multicomponent distillation is involved.
- Correct Answer
- relative volatility is reasonably constant.
- 1. Absorption factor is defined as (where, S1 = slope of the operating line S2 = slope of the equilibrium curve)
Options- A. S2/S1
- B. S1/S2
- C. S1 - S2
- D. S1 x S2 Discuss
- 2. The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is
Options- A. +ve
- B. -ve
- C. zero
- D. none of these Discuss
- 3. The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = __________
Options- A. 1
- B. 0.5
- C. 10
- D. 0 Discuss
- 4. In distillation columns, the number of bubble caps per tray primarily depends upon the
Options- A. allowable liquid velocity.
- B. allowable gas velocity.
- C. allowable gas and liquid velocities.
- D. feed composition. Discuss
- 5. The term "cooling range" in a cooling tower refers to the difference in the temperature of
Options- A. cold water leaving the tower and the wet bulb temperature of the surrounding air.
- B. hot water entering the tower and the wet bulb temperature of the surrounding air.
- C. hot water entering the tower and the cooled water leaving the tower.
- D. none of these Discuss
- 6. Which of the following is the most suitable for extraction in a system having very low density difference?
Options- A. Mixer-settler extractor
- B. Centrifugal extractor
- C. Pulsed extractor
- D. Packed extraction tower Discuss
- 7. Low viscosity absorbent is preferred for reasons of
Options- A. rapid absorption rates and good heat transfer characteristics.
- B. improved flooding characteristics.
- C. low pressure drop on pumping.
- D. all (a), (b) and (c). Discuss
- 8. Raoult's law applies to the
Options- A. all liquid solutions
- B. non-ideal solution only.
- C. non-volatile solute.
- D. solvents. Discuss
- 9. Which of the following quantities need not be fixed before starting the design of a co-current absorber?
Options- A. Heat gain or loss
- B. Flow rate of entering liquid
- C. Flow rate of gas
- D. None of these Discuss
- 10. Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the __________ of a fibre.
Options- A. electrical resistance
- B. thermal conductivity
- C. strength
- D. none of these. Discuss
Mass Transfer problems
Search Results
Correct Answer: S1/S2
Correct Answer: +ve
Correct Answer: 1
Correct Answer: allowable gas and liquid velocities.
Correct Answer: hot water entering the tower and the cooled water leaving the tower.
Correct Answer: Centrifugal extractor
Correct Answer: all (a), (b) and (c).
Correct Answer: solvents.
Correct Answer: Flow rate of entering liquid
Correct Answer: electrical resistance
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