Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
Emissivity of a body will be equal to its absorptivity at all temperatures.
Options- A. Yes
- B. No
- Correct Answer
- No
- 1. The expansion valve in a refrigerator controls the flow of refrigerant.
Options- A. Correct
- B. Incorrect Discuss
- 2. The by-pass factor of a cooling coil decreases with
Options- A. decrease in fin spacing and increase in number of rows
- B. increase in fin spacing and increase in number of rows
- C. increase in fin spacing and decrease in number of rows
- D. decrease in fin spacing and decrease in number of rows Discuss
- 3. The heat is transferred by conduction, convection and radiation in
Options- A. melting of ice
- B. boiler furnaces
- C. condensation of steam in condenser
- D. none of these Discuss
- 4. Environmental protection agencies advice against the use of chloro-fluoro-carbon refrigerants since
Options- A. these react with water vapour and cause acid rain
- B. these react with plants and cause green-house effect
- C. these react with oxygen and cause its depletion
- D. these react with ozone layer Discuss
- 5. The __________ point of ammonia is -77.7°C.
Options- A. freezing
- B. boiling Discuss
- 6. The by-pass factor, in case of sensible cooling of air, is given by (where td1 = Dry bulb temperature of air entering the cooling coil, td2 = Dry bulb temperature of air leaving the cooling coil, and td3 = Dry bulb temperature of the cooling coil)
Options- A.
- B.
- C.
- D.
Discuss
- 7. A mixture of dry air and water vapour, when the air has diffused the maximum amount of water vapour into it, is called
Options- A. dry air
- B. moist air
- C. saturated air
- D. specific humidity Discuss
- 8. The pressure at the outlet of a refrigerant compressor is called
Options- A. suction pressure
- B. discharge pressure
- C. critical pressure
- D. back pressure Discuss
- 9. For unsaturated air, the dew point temperature is __________ wet bulb temperature.
Options- A. equal to
- B. less than
- C. more than Discuss
- 10. A thermostatic expansion valve in a refrigeration system
Options- A. ensures the evaporator completely filled with refrigerant of the load
- B. is suitable only for constant load systems
- C. maintains different temperatures in evaporator in proportion to load
- D. none of the above Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: Correct
Correct Answer: decrease in fin spacing and increase in number of rows
Correct Answer: boiler furnaces
Correct Answer: these react with ozone layer
Correct Answer: freezing
Correct Answer:
Correct Answer: saturated air
Correct Answer: discharge pressure
Correct Answer: less than
Correct Answer: ensures the evaporator completely filled with refrigerant of the load
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