Heat Transfer, Refrigeration and Air Conditioning problems
- 1. Bell-Coleman cycle is a
Options- A. reversed Carnot cycle
- B. reversed Otto cycle
- C. reversed Joule cycle
- D. reversed Rankine cycle Discuss
Correct Answer: reversed Joule cycle
- 2. Which of the following statement is correct?
Options- A. A grey body is one which absorbs all radiations incident on it.
- B. At thermal equilibrium, the emissivity and absorptivity are same.
- C. The energy absorbed by a body to the total energy falling on it, is called emissivity.
- D. A perfect body is one which is black in colour. Discuss
Correct Answer: At thermal equilibrium, the emissivity and absorptivity are same.
- 3. The sulphur sticks, in case of leakage of ammonia refrigerant, gives white smoke.
Options- A. True
- B. False Discuss
Correct Answer: True
- 4. The transfer of heat from one body to another takes place only when there is a temperature difference between the bodies.
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
- 5. During gas charging in an ammonia vapour compression system, the connection is made at the compressor outlet.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 6. The water, alcohol and ammonia have same refrigerating effect at different altitudes.
Options- A. Yes
- B. No Discuss
Correct Answer: No
- 7. The wet bulb temperature at 100% relative humidity is __________ dew point temperature.
Options- A. same as
- B. lower than
- C. higher than Discuss
Correct Answer: same as
- 8. Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ? = Density of substance, S = Specific heat, and k = Thermal conductivity)
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 9. The counter-current flow heat exchanger can transfer __________ heat than parallel flow heat exchanger.
Options- A. less
- B. more Discuss
Correct Answer: more
- 10. The natural convection air cooled condensers are used in
Options- A. domestic refrigerators
- B. water coolers
- C. room air conditioners
- D. all of these Discuss
Correct Answer: domestic refrigerators
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