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- Question
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.
- Correct Answer
- increases.
- 1. Kirchoff s law applies to __________ radiation.
Options- A. total
- B. monochromatic
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 2. 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
- 3. 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
- 4. Reynold's analogy states that
Options- A. Nst ? f
- B. Nst ? NRe
- C. NNu ? f
- D. NRe ? f Discuss
- 5. 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
- 6. 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
- 7. 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
- 8. Fourier's law applies to the heat transfer by
Options- A. convection
- B. radiation
- C. conduction
- D. all (a), (b) & (c) Discuss
- 9. 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
- 10. 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
Heat Transfer problems
Search Results
Correct Answer: both (a) & (b)
Correct Answer: Both (b) and (c)
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: all (a), (b) and (c).
Correct Answer: none of these.
Correct Answer: conduction
Correct Answer: I2R
Correct Answer: Orifice baffles are never used in a shell and tube heat exchanger.
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