Heat Transfer, Refrigeration and Air Conditioning problems
- 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
Correct Answer: both room sensible heat and latent heat loads
- 2. 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
Correct Answer: all of these
- 3. 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
Correct Answer: all of the above
- 4. 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
Correct Answer: heating and humidification
- 5. Which of the following refrigerant has the highest freezing point.
Options- A. Ammonia
- B. Carbon dioxide
- C. Sulphur dioxide
- D. R-12 Discuss
Correct Answer: Carbon dioxide
- 6. In mechanical refrigeration system, the refrigerant occurs as liquid between condenser and expansion valve.
Options- A. True
- B. False Discuss
Correct Answer: True
- 7. 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
Correct Answer: heat absorbed by the evaporator to the heat supplied by the gas burner
- 8. The freon group of refrigerants are
Options- A. halo-carbon refrigerants
- B. azeotrope refrigerants
- C. inorganic refrigerants
- D. hydro-carbon refrigerants Discuss
Correct Answer: halo-carbon refrigerants
- 9. The sensible heat gain is due to the __________ difference between the fresh air and the air in space.
Options- A. temperature
- B. humidity Discuss
Correct Answer: temperature
- 10. At 100% relative humidity, wet bulb temperature, dry bulb temperature, dew point temperature and saturation temperature are equal.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
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