Heat Transfer, Refrigeration and Air Conditioning problems
- 1. A device used for transfering heat from one fluid to another is called heat exchanger.
Options- A. True
- B. False Discuss
Correct Answer: True
- 2. The relative humidity __________ as air gets drier.
Options- A. increases
- B. decreases Discuss
Correct Answer: increases
- 3. The product of Reynolds number and Prandtl number is known as
Options- A. Stanton number
- B. Biot number
- C. Peclet number
- D. Grashoff number Discuss
Correct Answer: Peclet number
- 4. The boiling point of ammonia is
Options- A. -10.5°C
- B. -30°C
- C. -33.3°C
- D. -77.7°C Discuss
Correct Answer: -33.3°C
- 5. A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in higher coefficient of performance.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 6. During humidification process, dry bulb temperature
Options- A. remains constant
- B. increases
- C. decreases Discuss
Correct Answer: remains constant
- 7. The condition of refrigerant after passing through the condenser in a vapour compression system is
Options- A. saturated liquid
- B. wet vapour
- C. dry saturated vapour
- D. superheated vapour Discuss
Correct Answer: saturated liquid
- 8. Fourier's law of heat conduction gives the heat flow for
Options- A. irregular surfaces
- B. non-uniform temperature surfaces
- C. one dimensional cases only
- D. two dimensional cases only Discuss
Correct Answer: one dimensional cases only
- 9. In a shell and tube heat exchanger, baffles are provided on the shell side to
Options- A. improve heat transfer
- B. provide support for tubes
- C. prevent stagnation of shell side fluid
- D. all of these Discuss
Correct Answer: all of these
- 10. Dew point temperature is the temperature of air recorded by a thermometer, when the moisture present in it begins to condense.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
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