Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
The by-pass factor (B. P. F.) in case of sensible heating of air is (Where td1 = Dry bulb temperature of air entering the heating coil, td2 = Dry bulb temperature of air leaving the heating coil, and td3 = Dry bulb temperature of heating coil)
Options- A.
- B.
- C.
- D.
- Correct Answer
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- 1. The thermal diffusivity for solids is generally less than those for liquids and gases.
Options- A. True
- B. False Discuss
- 2. Relative humidity is given by (where pv = Partial pressure of water vapour, pb = Barometric pressure, ps = Pressure of saturated air, pd = Pressure at dry bulb temperature, pw = Saturation pressure corresponding to wet bulb temperature, and ? = Degree of saturation)
Options- A.
- B.
- C.
- D. none of these Discuss
- 3. The reduced ambient air cooling system has
Options- A. one cooling turbine and one heat exchanger
- B. one cooling turbine and two heat exchangers
- C. two cooling turbines and one heat exchanger
- D. two cooling turbines and two heat exchangers Discuss
- 4. Planck's law holds good for all coloured bodies.
Options- A. True
- B. False Discuss
- 5. The specific humidity during humidification process
Options- A. remains constant
- B. increases
- C. decreases Discuss
- 6. A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be
Options- A. 1/4
- B. 1/3
- C. 3
- D. 4 Discuss
- 7. The capacity of a domestic refrigerator is in the range of
Options- A. 0.1 to 0.3 TR
- B. 1 to 3 TR
- C. 3 to 5 TR
- D. 5 to 7 TR Discuss
- 8. Carbon dioxide is
Options- A. colourless
- B. odourless
- C. non-flammable
- D. all of these Discuss
- 9. The difference between dry bulb temperature and dew point temperature, is called
Options- A. dry bulb depression
- B. wet bulb depression
- C. dew point depression
- D. degree of saturation Discuss
- 10. Conduction is the process of heat transfer from one particle of the body to another by the actual motion of the heated particles.
Options- A. True
- B. False Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: False
Correct Answer:
Correct Answer: two cooling turbines and one heat exchanger
Correct Answer: True
Correct Answer: increases
Correct Answer: 4
Correct Answer: 0.1 to 0.3 TR
Correct Answer: all of these
Correct Answer: dew point depression
Correct Answer: False
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