Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
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
- Correct Answer
- negative
- 1. At 100% relative humidity, wet bulb temperature, dry bulb temperature, dew point temperature and saturation temperature are equal.
Options- A. Correct
- B. Incorrect Discuss
- 2. The sensible heat gain is due to the __________ difference between the fresh air and the air in space.
Options- A. temperature
- B. humidity Discuss
- 3. The freon group of refrigerants are
Options- A. halo-carbon refrigerants
- B. azeotrope refrigerants
- C. inorganic refrigerants
- D. hydro-carbon refrigerants Discuss
- 4. 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
- 5. In mechanical refrigeration system, the refrigerant occurs as liquid between condenser and expansion valve.
Options- A. True
- B. False Discuss
- 6. 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
- 7. According to Stefan's law, the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature.
Options- A. Correct
- B. Incorrect Discuss
- 8. During sensible heating of air, specific humidity remains constant.
Options- A. Agree
- B. Disagree Discuss
- 9. Air refrigeration cycle is used in
Options- A. commercial refrigerators
- B. domestic refrigerators
- C. air-conditioning
- D. gas liquefaction Discuss
- 10. In electrolux refrigerator
Options- A. ammonia is absorbed in hydrogen
- B. ammonia is absorbed in water
- C. ammonia evaporates in hydrogen
- D. hydrogen evaporates in ammonia Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: Correct
Correct Answer: temperature
Correct Answer: halo-carbon refrigerants
Correct Answer: heat absorbed by the evaporator to the heat supplied by the gas burner
Correct Answer: True
Correct Answer: superheated vapour refrigerant
Correct Answer: Correct
Correct Answer: Agree
Correct Answer: gas liquefaction
Correct Answer: ammonia evaporates in hydrogen
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