Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
A good refrigerant should have
Options- A. high latent heat of vaporisation and low freezing point
- B. high operating pressures and low freezing point
- C. high specific volume and high latent heat of vaporisation
- D. low C.O.P. and low freezing point
- Correct Answer
- high latent heat of vaporisation and low freezing point
- 1. 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
- 2. The wet bulb depression is zero when relative humidity is
Options- A. zero
- B. 0.5
- C. 0.75
- D. 1.0 Discuss
- 3. 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
- 4. Air refrigeration cycle is used in
Options- A. commercial refrigerators
- B. domestic refrigerators
- C. air-conditioning
- D. gas liquefaction Discuss
- 5. During sensible heating of air, specific humidity remains constant.
Options- A. Agree
- B. Disagree Discuss
- 6. Dew point temperature corresponds to the saturation temperature of vapour at its partial pressure.
Options- A. True
- B. False Discuss
- 7. The sensible heat during humidification process decreases.
Options- A. True
- B. False Discuss
- 8. Which of the following refrigerant has the maximum ozone depletion potential in the stratophere?
Options- A. Ammonia
- B. Carbon dioxide
- C. Sulphur dioxide
- D. Flourine Discuss
- 9. The unit of thermal diffusivity is
Options- A. m/hK
- B. m/h
- C. m2/h
- D. m2/hK Discuss
- 10. In a boot-strap air evaporative cooling system, the evaporator is provided
Options- A. between the combustion chamber and the first heat exchanger
- B. between the first heat exchanger and the secondary compressor
- C. between the secondary compressor and the second heat exchanger
- D. between the second heat exchanger and the cooling turbine Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: all of the above
Correct Answer: 1.0
Correct Answer: ammonia evaporates in hydrogen
Correct Answer: gas liquefaction
Correct Answer: Agree
Correct Answer: True
Correct Answer: False
Correct Answer: Flourine
Correct Answer: m2/h
Correct Answer: between the second heat exchanger and the cooling turbine
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