Discussion
Home ‣ Chemical Engineering ‣ Mass Transfer Comments
- Question
Physical absorption is
Options- A. an irreversible phenomenon.
- B. a reversible phenomenon.
- C. accompanied by evolution of heat.
- D. both (b) and (c)
- Correct Answer
- both (b) and (c)
- 1. Absorption accompanied with chemical reaction is exemplified by the absorption of
Options- A. ammonia in water.
- B. benzol present in coke oven gas by wash oil.
- C. SO2 in alkaline solution.
- D. all (a), (b) and (c). Discuss
- 2. 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
- 3. 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
- 4. Raoult's law applies to the
Options- A. all liquid solutions
- B. non-ideal solution only.
- C. non-volatile solute.
- D. solvents. Discuss
- 5. 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
- 6. In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG __________ the absorption factor.
Options- A. increases with increase in
- B. is one at unity value of
- C. both (a) and (b)
- D. neither (a) nor (b) Discuss
- 7. Make up water is required in a cooling tower to replace the water lost by
Options- A. evaporation
- B. drift
- C. blowdown and leakage
- D. all (a), (b) and (c) Discuss
- 8. Pick out the correct statement.
Options- A. In case of liquid-liquid extraction, no separation is possible, if the selectivity of the solvent used is unity.
- B. With increase in temperature, the selectivity of the solvent used in solvent extraction decreases.
- C. The selectivity of solvent used in solvent extraction is unity at the plait point.
- D. all (a), (b) and (c). Discuss
- 9. Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as
Options- A. K ? D
- B. K ?D
- C. K ? D1.5
- D. K ? D2 Discuss
- 10. Fenske equation determines the
Options- A. maximum number of ideal plates.
- B. height of the distillation column.
- C. minimum number of theoretical plates.
- D. optimum reflux ratio. Discuss
Mass Transfer problems
Search Results
Correct Answer: SO2 in alkaline solution.
Correct Answer: electrical resistance
Correct Answer: Flow rate of entering liquid
Correct Answer: solvents.
Correct Answer: all (a), (b) and (c).
Correct Answer: both (a) and (b)
Correct Answer: all (a), (b) and (c)
Correct Answer: all (a), (b) and (c).
Correct Answer: K ? D
Correct Answer: minimum number of theoretical plates.
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