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- Question
Leidenfrost point is a term concerned with the
Options- A. condensation of the saturated vapor on a cold surface.
- B. concentration of a corrosive solution by evaporation.
- C. heat transfer between two highly viscous liquids.
- D. boiling of a liquid on a hot surface.
- Correct Answer
- boiling of a liquid on a hot surface.
- 1. Black liquor generated during paper manufacture is concentrated in a
Options- A. single effect evaporator.
- B. single effect evaporator followed by a crystalliser.
- C. multiple effect evaporator.
- D. multiple effect evaporators followed by a crystalliser. Discuss
- 2. Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer.
Options- A. no
- B. the least
- C. the largest
- D. lower Discuss
- 3. The unit of heat transfer co-efficient in SI unit is
Options- A. J/M2°K
- B. W/m2°K
- C. W/m°K
- D. J/m°K Discuss
- 4. Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is
Options- A. finned tube heat exchanger with air inside and steam outside.
- B. finned tube heat exchanger with air outside and steam inside.
- C. shell and tube heat exchanger with air inside tubes and steam on shell side.
- D. shell and tube heat exchanger with air on shell side and steam inside tubes. Discuss
- 5. The actual temperature drop across the heating surface in an evaporator depends on the
Options- A. feed.
- B. depth of liquid over heating surface.
- C. pressure difference between steam chest and vapour space.
- D. all (a), (b) and (c). Discuss
- 6. Reynold's analogy states that
Options- A. Nst ? f
- B. Nst ? NRe
- C. NNu ? f
- D. NRe ? f Discuss
- 7. Pick out the wrong statement.
Options- A. The controlling resistance in case of heating of air by condensing steam is in the air film.
- B. The log mean temperature difference (LMTD) for counter flow and parallel flow can be theoretically same when any one of the fluids (hot or cold fluid) passes through the heat exchanger at constant temperature.
- C. In case of a 1 - 2 shell and tube heat exchanger, the LMTD correction factor value increases sharply, when a temperature cross occurs.
- D. Phase change in case of a pure fluid at a given pressure from liquid to vapor or vice-versa occurs at saturation temperature. Discuss
- 8. Which of the following is generally considered as opaque surface towards radiations?
Options- A. Gases
- B. Solids
- C. Liquids
- D. Both (b) and (c) Discuss
- 9. Kirchoff s law applies to __________ radiation.
Options- A. total
- B. monochromatic
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 10. With the increase of temperature, the Col-burn jH factor
Options- A. increases.
- B. decreases.
- C. remains unchanged.
- D. may increase or decrease ; depending on temperature. Discuss
Heat Transfer problems
Search Results
Correct Answer: multiple effect evaporator.
Correct Answer: the largest
Correct Answer: W/m2°K
Correct Answer: finned tube heat exchanger with air outside and steam inside.
Correct Answer: all (a), (b) and (c).
Correct Answer: Nst ? f
Correct Answer: In case of a 1 - 2 shell and tube heat exchanger, the LMTD correction factor value increases sharply, when a temperature cross occurs.
Correct Answer: Both (b) and (c)
Correct Answer: both (a) & (b)
Correct Answer: increases.
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