Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
The condition of refrigerant after leaving the compressor and before entering the condenser is superheated vapour.
Options- A. Yes
- B. No
- Correct Answer
- Yes
- 1. Which of the following represents a heat pump?
Options- A.
- B.
- C.
- D.
Discuss
- 2. In case of solids, the heat transfer takes place according to radiation.
Options- A. Correct
- B. Incorrect Discuss
- 3. The humidity ratio or specific humidity is the mass of water vapour present in
Options- A. 1 m3 of wet air
- B. 1 m3 of dry air
- C. 1 kg of wet air
- D. 1 kg of dry air Discuss
- 4. In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the
Options- A. Reynold's number
- B. Grashoff's number
- C. Reynold's number, Grashoff's number
- D. Prandtl number, Grashoff's number Discuss
- 5. The critical radius is the insulation radius at which the resistance to heat flow is
Options- A. maximum
- B. minimum
- C. zero
- D. none of these Discuss
- 6. The heat transfer takes place according to
Options- A. Zeroth law of thermodynamics
- B. First law of thermodynamics
- C. Second law of thermodynamics
- D. Kirchhoff's law Discuss
- 7. The amount of radiation mainly depends upon the
Options- A. nature of the body
- B. temperature of the body
- C. type of surface of the body
- D. all of these Discuss
- 8. The temperature of ammonia after compression in a vapour compression system is
Options- A. 20 to 50° C
- B. 50 to 70° C
- C. 70 to 110° C
- D. none of these Discuss
- 9. The coefficient of performance of Heat Pump is always __________ one.
Options- A. equal to
- B. less than
- C. greater than Discuss
- 10. Degree of saturation or percentage humidity is
Options- A. the mass of water vapour present in 1 m3 of dry air
- B. the mass of water vapour present in 1 kg of dry air
- C. the ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure.
- D. the ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer:
Correct Answer: Incorrect
Correct Answer: 1 kg of dry air
Correct Answer: Prandtl number, Grashoff's number
Correct Answer: minimum
Correct Answer: Second law of thermodynamics
Correct Answer: all of these
Correct Answer: 70 to 110° C
Correct Answer: greater than
Correct Answer: the ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure.
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