Discussion
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- Question
Which is the controlling factor for a drum drier?
Options- A. Diffusion
- B. Heat transfer
- C. Both (a) and (b)
- D. Neither (a) nor (b)
- Correct Answer
- Heat transfer
- 1. The equivalent diameter for pressure drop is __________ that for heat transfer.
Options- A. smaller than
- B. greater than
- C. equal to
- D. not related with Discuss
- 2. Air is best heated with steam in a heat exchanger of
Options- A. plate type.
- B. double pipe type with fin on steam side.
- C. double pipe type with fin on air side.
- D. shell and tube type. Discuss
- 3. Pick out the wrong statement.
Options- A. Orifice baffles are never used in a shell and tube heat exchanger.
- B. Pressure drop on the shell side of a heat exchanger depends upon tube pitch also.
- C. In a horizontal tube evaporator, surface blanketing by air is avoided.
- D. Split ring type and pull through type floating heads are two commonly used floating heads is heat exchangers. Discuss
- 4. Heat produced when a steady state current, I passes through an electrical conductor having resistance, 'R' is
Options- A. IR
- B. I2R
- C. IR2
- D. I2R2 Discuss
- 5. Fourier's law applies to the heat transfer by
Options- A. convection
- B. radiation
- C. conduction
- D. all (a), (b) & (c) Discuss
- 6. When the temperature and humidity of air is low, we usually use __________ draft cooling tower.
Options- A. natural
- B. forced
- C. induced
- D. none of these Discuss
- 7. Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.
Options- A. chemical properties
- B. physical properties
- C. degree of turbulence
- D. interfacial area Discuss
- 8. With increase in pressure, the relative volatility for a binary system
Options- A. increases.
- B. decreases.
- C. remains same.
- D. either (a) or (b), depends on the system. Discuss
- 9. In batch distillation with constant reflux, overhead product composition __________ with time.
Options- A. increases
- B. decreases
- C. does not vary
- D. may increase on decrease, depends on the system. Discuss
- 10. Overall efficiency of the distillation column is
Options- A. the ratio of number of ideal plates to actual plates.
- B. the ratio of number of actual plates to ideal plates.
- C. same as the Murphree efficiency.
- D. always more than the point efficiency. Discuss
Mass Transfer problems
Search Results
Correct Answer: smaller than
Correct Answer: double pipe type with fin on air side.
Correct Answer: Orifice baffles are never used in a shell and tube heat exchanger.
Correct Answer: I2R
Correct Answer: conduction
Correct Answer: natural
Correct Answer: chemical properties
Correct Answer: decreases.
Correct Answer: decreases
Correct Answer: the ratio of number of ideal plates to actual plates.
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