Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
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
- Correct Answer
- heat absorbed by the evaporator to the heat supplied by the gas burner
- 1. In mechanical refrigeration system, the refrigerant occurs as liquid between condenser and expansion valve.
Options- A. True
- B. False Discuss
- 2. Which of the following refrigerant has the highest freezing point.
Options- A. Ammonia
- B. Carbon dioxide
- C. Sulphur dioxide
- D. R-12 Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. The freon group of refrigerants are
Options- A. halo-carbon refrigerants
- B. azeotrope refrigerants
- C. inorganic refrigerants
- D. hydro-carbon refrigerants Discuss
- 7. The sensible heat gain is due to the __________ difference between the fresh air and the air in space.
Options- A. temperature
- B. humidity Discuss
- 8. At 100% relative humidity, wet bulb temperature, dry bulb temperature, dew point temperature and saturation temperature are equal.
Options- A. Correct
- B. Incorrect Discuss
- 9. When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be
Options- A. positive
- B. negative
- C. zero
- D. none of these Discuss
- 10. The refrigerant supplied to a compressor must be
Options- A. superheated vapour refrigerant
- B. dry saturated liquid refrigerant
- C. a mixture of liquid and vapour refrigerant
- D. none of these Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: True
Correct Answer: Carbon dioxide
Correct Answer: heating and humidification
Correct Answer: all of the above
Correct Answer: all of these
Correct Answer: halo-carbon refrigerants
Correct Answer: temperature
Correct Answer: Correct
Correct Answer: negative
Correct Answer: superheated vapour refrigerant
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