Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
The unit of thermal diffusivity is
Options- A. m/hK
- B. m/h
- C. m2/h
- D. m2/hK
- Correct Answer
- m2/h
- 1. 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
- 2. The sensible heat during humidification process decreases.
Options- A. True
- B. False Discuss
- 3. Dew point temperature corresponds to the saturation temperature of vapour at its partial pressure.
Options- A. True
- B. False Discuss
- 4. 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
- 5. 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
- 6. 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
- 7. The ratio of Nusselt number and the product of Reynold's number and Prandtl number is equal to
Options- A. Stanton number
- B. Biot number
- C. Peclet number
- D. Grashoff number Discuss
- 8. In a shell and coil condenser, water flows in the shell and the refrigerant in the coil.
Options- A. True
- B. False Discuss
- 9. The condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression system is
Options- A. high pressure saturated liquid
- B. wet vapour
- C. very wet vapour
- D. dry vapour Discuss
- 10. In a vapour compression system, the condition of refrigerant before entering the expansion or throttle valve is
Options- A. high pressure saturated liquid
- B. wet vapour
- C. very wet vapour
- D. dry vapour Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: Flourine
Correct Answer: False
Correct Answer: True
Correct Answer: high latent heat of vaporisation and low freezing point
Correct Answer: all of the above
Correct Answer: between the second heat exchanger and the cooling turbine
Correct Answer: Stanton number
Correct Answer: False
Correct Answer: very wet vapour
Correct Answer: high pressure saturated liquid
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