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- Question
Which of the following is generally considered as opaque surface towards radiations?
Options- A. Gases
- B. Solids
- C. Liquids
- D. Both (b) and (c)
- Correct Answer
- Both (b) and (c)
- 1. 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
- 2. Reynold's analogy states that
Options- A. Nst ? f
- B. Nst ? NRe
- C. NNu ? f
- D. NRe ? f Discuss
- 3. 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. Discuss
- 4. 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
- 5. 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
- 6. Kirchoff s law applies to __________ radiation.
Options- A. total
- B. monochromatic
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 7. 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
- 8. Crystal size in a continuous crystalliser depends upon the
Options- A. rate of heat transfer.
- B. degree of turbulence.
- C. degree of supersaturation.
- D. all (a), (b) and (c). Discuss
- 9. Shell side pressure drop in a shell and tube heat exchanger does not depend upon the
Options- A. baffle spacing & shell diameter.
- B. tube diameter & pitch.
- C. viscosity, density & mass velocity of shell side fluid.
- D. none of these. Discuss
- 10. Fourier's law applies to the heat transfer by
Options- A. convection
- B. radiation
- C. conduction
- D. all (a), (b) & (c) Discuss
Heat Transfer problems
Search Results
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: Nst ? f
Correct Answer: boiling of a liquid on a hot surface.
Correct Answer: multiple effect evaporator.
Correct Answer: the largest
Correct Answer: both (a) & (b)
Correct Answer: increases.
Correct Answer: all (a), (b) and (c).
Correct Answer: none of these.
Correct Answer: conduction
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