Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
Which of the following would lead to a reduction in thermal resistance?
Options- A. In conduction, reduction in the thickness of the material and an increase in thermal conductivity.
- B. In convection, stirring of the fluid and cleaning the heating surface.
- C. In radiation, increasing the temperature and reducing the emissivity.
- D. all of the above
- Correct Answer
- all of the above
- 1. A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be
Options- A. lack of cooling water
- B. water temperature being high
- C. dirty condenser surface
- D. all of these Discuss
- 2. The conditioned air supplied to the room must have the capacity to take up
Options- A. room sensible heat load only
- B. room latent heat load only
- C. both room sensible heat and latent heat loads
- D. none of the above Discuss
- 3. 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
- 4. The counter-current flow heat exchanger can transfer __________ heat than parallel flow heat exchanger.
Options- A. less
- B. more Discuss
- 5. 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
- 6. The process, generally used in winter air-conditioning to warm and humidity the air, is called
Options- A. humidification.
- B. dehumidification
- C. heating and humidification
- D. cooling and dehumidification Discuss
- 7. Which of the following refrigerant has the highest freezing point.
Options- A. Ammonia
- B. Carbon dioxide
- C. Sulphur dioxide
- D. R-12 Discuss
- 8. In mechanical refrigeration system, the refrigerant occurs as liquid between condenser and expansion valve.
Options- A. True
- B. False Discuss
- 9. The coefficient of performance of electrolux refrigerator is the ratio of
Options- A. heat supplied by the gas burner to the heat absorbed by the evaporator
- B. heat absorbed by the evaporator to the heat supplied by the gas burner
- C. heat supplied by the gas burner minus the heat absorbed by the evaporator to the heat supplied by the gas burner
- D. heat absorbed by the evaporator minus the heat supplied by the gas burner to the heat absorbed by the evaporator Discuss
- 10. The freon group of refrigerants are
Options- A. halo-carbon refrigerants
- B. azeotrope refrigerants
- C. inorganic refrigerants
- D. hydro-carbon refrigerants Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: all of these
Correct Answer: both room sensible heat and latent heat loads
Correct Answer: domestic refrigerators
Correct Answer: more
Correct Answer:
Correct Answer: heating and humidification
Correct Answer: Carbon dioxide
Correct Answer: True
Correct Answer: heat absorbed by the evaporator to the heat supplied by the gas burner
Correct Answer: halo-carbon refrigerants
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