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- Question
Dew point of a gas-vapour mixture
Options- A. increases with temperature rise.
- B. decreases with temperature rise.
- C. decreases with decrease in pressure.
- D. increases with increase in pressure.
- Correct Answer
- decreases with decrease in pressure.
- 1. Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a
Options- A. higher dew point.
- B. higher absolute (specific) humidity.
- C. higher relative humidity
- D. higher wet bulb temperature. Discuss
- 2. Which of the following remains constant during sensible cooling process?
Options- A. Specific humidity
- B. Partial pressure of vapour
- C. Both (a) and (b)
- D. Neither (a) nor (b) Discuss
- 3. Total reflux in a distillation operation requires minimum
Options- A. reboiler load
- B. number of plates
- C. condenser load
- D. all (a), (b) and (c) Discuss
- 4. As the reflux ratio in a distillation coloumn is increased from the minimum, the
Options- A. slope of the operating line in stripping section decreases.
- B. number of plates decreases very slowly first and then more and more rapidly.
- C. total cost first decreases and then increases.
- D. liquid flow increases while the vapor flow decreases for a system. Discuss
- 5. The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is
Options- A. natural draft cooling tower
- B. induced draft cooling tower
- C. spray chamber
- D. none of these Discuss
- 6. To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate)
Options- A. increase both 'G' and 'S'.
- B. decrease both 'G' and 'S'.
- C. increase 'S' and decrease 'G'.
- D. increase 'G' and decrease 'S' Discuss
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Mass Transfer problems
Search Results
Correct Answer: higher relative humidity
Correct Answer: Both (a) and (b)
Correct Answer: number of plates
Correct Answer: total cost first decreases and then increases.
Correct Answer: spray chamber
Correct Answer: increase 'S' and decrease 'G'.
Correct Answer: hot water entering the tower and the cooled water leaving the tower.
Correct Answer: allowable gas and liquid velocities.
Correct Answer: 1
Correct Answer: +ve
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