Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ? = Density of substance, S = Specific heat, and k = Thermal conductivity)
Options- A.
- B.
- C.
- D.
- Correct Answer
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- 1. The wet bulb temperature at 100% relative humidity is __________ dew point temperature.
Options- A. same as
- B. lower than
- C. higher than Discuss
- 2. The water, alcohol and ammonia have same refrigerating effect at different altitudes.
Options- A. Yes
- B. No Discuss
- 3. During gas charging in an ammonia vapour compression system, the connection is made at the compressor outlet.
Options- A. Agree
- B. Disagree Discuss
- 4. The transfer of heat from one body to another takes place only when there is a temperature difference between the bodies.
Options- A. Yes
- B. No Discuss
- 5. The sulphur sticks, in case of leakage of ammonia refrigerant, gives white smoke.
Options- A. True
- B. False Discuss
- 6. The counter-current flow heat exchanger can transfer __________ heat than parallel flow heat exchanger.
Options- A. less
- B. more Discuss
- 7. The natural convection air cooled condensers are used in
Options- A. domestic refrigerators
- B. water coolers
- C. room air conditioners
- D. all of these Discuss
- 8. The conditioned air supplied to the room must have the capacity to take up
Options- A. room sensible heat load only
- B. room latent heat load only
- C. both room sensible heat and latent heat loads
- D. none of the above Discuss
- 9. A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be
Options- A. lack of cooling water
- B. water temperature being high
- C. dirty condenser surface
- D. all of these Discuss
- 10. Which of the following would lead to a reduction in thermal resistance?
Options- A. In conduction, reduction in the thickness of the material and an increase in thermal conductivity.
- B. In convection, stirring of the fluid and cleaning the heating surface.
- C. In radiation, increasing the temperature and reducing the emissivity.
- D. all of the above Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: same as
Correct Answer: No
Correct Answer: Agree
Correct Answer: Yes
Correct Answer: True
Correct Answer: more
Correct Answer: domestic refrigerators
Correct Answer: both room sensible heat and latent heat loads
Correct Answer: all of these
Correct Answer: all of the above
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