Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
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
- Correct Answer
- Correct
- 1. 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
- 2. 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
- 3. At 100% relative humidity, wet bulb temperature, dry bulb temperature, dew point temperature and saturation temperature are equal.
Options- A. Correct
- B. Incorrect Discuss
- 4. The sensible heat gain is due to the __________ difference between the fresh air and the air in space.
Options- A. temperature
- B. humidity Discuss
- 5. The freon group of refrigerants are
Options- A. halo-carbon refrigerants
- B. azeotrope refrigerants
- C. inorganic refrigerants
- D. hydro-carbon refrigerants Discuss
- 6. During sensible heating of air, specific humidity remains constant.
Options- A. Agree
- B. Disagree Discuss
- 7. Air refrigeration cycle is used in
Options- A. commercial refrigerators
- B. domestic refrigerators
- C. air-conditioning
- D. gas liquefaction Discuss
- 8. 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
- 9. The wet bulb depression is zero when relative humidity is
Options- A. zero
- B. 0.5
- C. 0.75
- D. 1.0 Discuss
- 10. Which of the following statement is correct?
Options- A. The constant enthalpy lines are also constant wet bulb temperature lines.
- B. The wet bulb and dry bulb temperature are equal at saturation condition.
- C. The wet bulb temperature is a measure of enthalpy of moist air.
- D. all of the above Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: superheated vapour refrigerant
Correct Answer: negative
Correct Answer: Correct
Correct Answer: temperature
Correct Answer: halo-carbon refrigerants
Correct Answer: Agree
Correct Answer: gas liquefaction
Correct Answer: ammonia evaporates in hydrogen
Correct Answer: 1.0
Correct Answer: all of the above
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