Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
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
- Correct Answer
- all of these
- 1. 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
- 2. 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
- 3. The counter-current flow heat exchanger can transfer __________ heat than parallel flow heat exchanger.
Options- A. less
- B. more Discuss
- 4. 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
- 5. The wet bulb temperature at 100% relative humidity is __________ dew point temperature.
Options- A. same as
- B. lower than
- C. higher than Discuss
- 6. 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 Discuss
- 7. 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
- 8. Which of the following refrigerant has the highest freezing point.
Options- A. Ammonia
- B. Carbon dioxide
- C. Sulphur dioxide
- D. R-12 Discuss
- 9. In mechanical refrigeration system, the refrigerant occurs as liquid between condenser and expansion valve.
Options- A. True
- B. False Discuss
- 10. 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
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: both room sensible heat and latent heat loads
Correct Answer: domestic refrigerators
Correct Answer: more
Correct Answer:
Correct Answer: same as
Correct Answer: all of the above
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
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