Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
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
- Correct Answer
- ammonia evaporates in hydrogen
- 1. Air refrigeration cycle is used in
Options- A. commercial refrigerators
- B. domestic refrigerators
- C. air-conditioning
- D. gas liquefaction Discuss
- 2. During sensible heating of air, specific humidity remains constant.
Options- A. Agree
- B. Disagree Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. The wet bulb depression is zero when relative humidity is
Options- A. zero
- B. 0.5
- C. 0.75
- D. 1.0 Discuss
- 7. 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
- 8. 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 Discuss
- 9. Dew point temperature corresponds to the saturation temperature of vapour at its partial pressure.
Options- A. True
- B. False Discuss
- 10. The sensible heat during humidification process decreases.
Options- A. True
- B. False Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: gas liquefaction
Correct Answer: Agree
Correct Answer: Correct
Correct Answer: superheated vapour refrigerant
Correct Answer: negative
Correct Answer: 1.0
Correct Answer: all of the above
Correct Answer: high latent heat of vaporisation and low freezing point
Correct Answer: True
Correct Answer: False
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