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- Question
Which of the following plays an important role in problems of simultaneous heat and mass transfer?
Options- A. Lewis number
- B. Schmidt number
- C. Prandtl number
- D. Sherwood number
- Correct Answer
- Lewis number
- 1. __________ columns are used for liquid dispersion in a continuous gas phase.
Options- A. Packed
- B. Pulse
- C. Bubble cap
- D. Sieve plate Discuss
- 2. A plait point is the point on the solubility curve, where the tie line reduces to a point. What is the number of plait point for a ternery system containing twopairs of partially miscible liquids?
Options- A. 0
- B. 1
- C. 2
- D. 3 Discuss
- 3. Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1°F is called the
Options- A. latent heat
- B. humid heat
- C. specific heat
- D. sensible heat Discuss
- 4. Drying operation under vacuum is carried out to
Options- A. dry those materials which have very high unbound mositure content.
- B. reduce drying temperature.
- C. increase drying temperature.
- D. dry materials having high bound moisture content. Discuss
- 5. In distillation, overhead product contains
Options- A. only one component
- B. two components
- C. any number of components
- D. only saturated liquid Discuss
- 6. The rate of solid-liquid extraction is limited by the
Options- A. phase change of the solute as it dissolves in the solvent.
- B. diffusion of the solute through the solvent in the pores to the outside of the particle.
- C. diffusion of the solute from the solution in contact with the particle to the main bulk of the solution.
- D. all 'a', 'b' & 'c'. Discuss
- 7. Mass transfer co-efficient of liquid is
Options- A. affected more by temperature than that for gases.
- B. affected much less by temperature than that for gases.
- C. not affected by the temperature.
- D. none of these. Discuss
- 8. Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N2 & H2 is high. The presence of promoter along with the catalyst helps in __________ of the catalyst.
Options- A. stabilisation
- B. increasing the effectiveness
- C. improving the strength & heat resistance
- D. all a, b & c Discuss
- 9. Phosphorus vapour comprises of
Options- A. P
- B. P2
- C. P3
- D. P4 Discuss
- 10. Which is the most suitable fertiliser for paddy?
Options- A. CAN
- B. Ammonium sulphate
- C. Ammonium nitrate
- D. Superphosphate Discuss
Mass Transfer problems
Search Results
Correct Answer: Packed
Correct Answer: 0
Correct Answer: specific heat
Correct Answer: reduce drying temperature.
Correct Answer: any number of components
Correct Answer: all 'a', 'b' & 'c'.
Correct Answer: affected more by temperature than that for gases.
Correct Answer: all a, b & c
Correct Answer: P4
Correct Answer: Ammonium sulphate
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