Heat Transfer, Refrigeration and Air Conditioning problems
- 1. The sensible heat during humidification process decreases.
Options- A. True
- B. False Discuss
Correct Answer: False
- 2. 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
Correct Answer: Flourine
- 3. The unit of thermal diffusivity is
Options- A. m/hK
- B. m/h
- C. m2/h
- D. m2/hK Discuss
Correct Answer: m2/h
- 4. 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
Correct Answer: between the second heat exchanger and the cooling turbine
- 5. 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
Correct Answer: Stanton number
- 6. In a shell and coil condenser, water flows in the shell and the refrigerant in the coil.
Options- A. True
- B. False Discuss
Correct Answer: False
- 7. 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
Correct Answer: very wet vapour
- 8. 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
Correct Answer: high pressure saturated liquid
- 9. The condition of refrigerant as it leaves the compressor in a vapour compression system is
Options- A. saturated liquid
- B. wet vapour
- C. dry saturated vapour
- D. superheated vapour Discuss
Correct Answer: superheated vapour
- 10. Which of the following statement is correct?
Options- A. The human body can lose heat even if its temperature is less than the atmospheric temperature.
- B. The increase in air movement increases the evaporation from the human body.
- C. The warm air increases the rate of radiation of heat from the human body.
- D. both (a) and (b) Discuss
Correct Answer: both (a) and (b)
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