Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
Radiation is the process of heat transfer in which heat flows from a __________ , in a straight line, without affecting the intervening medium.
Options- A. cold body to hot body
- B. hot body to cold body
- C. smaller body to larger body
- D. larger body to smaller body
- Correct Answer
- hot body to cold body
- 1. A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in __________ power per tonne of refrigeration.
Options- A. same
- B. lower
- C. higher Discuss
- 2. The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body
Options- A. move actually
- B. do not move actually
- C. affect the intervening medium
- D. does not affect the intervening medium Discuss
- 3. In larger industrial and commercial reciprocating compression systems, refrigerent widely used is
Options- A. ammonia
- B. carbon dioxide
- C. sulphur dioxide
- D. R-12 Discuss
- 4. Oil separator in a refrigeration cycle is installed
Options- A. before compressor
- B. between compressor and condenser
- C. between condenser and evaporator
- D. between condenser and expansion valve Discuss
- 5. The freezing point of sulphur dioxide is
Options- A. -56.6°C
- B. -75.2°C
- C. -77.7°C
- D. -135.8°C Discuss
- 6. The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T1 = Lowest absolute temperature, and T2 = Highest absolute temperature)
Options- A.
- B.
- C.
- D.
Discuss
- 7. In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the
Options- A. expansion valve to the evaporator
- B. evaporator to the thermostat
- C. condenser to the expansion valve
- D. condenser to the evaporator Discuss
- 8. The process, generally used in summer air conditioning to cool and dehumidify the air, is called
Options- A. humidification
- B. dehumidification
- C. heating and humidification
- D. cooling and dehumidification Discuss
- 9. The capillary tube, as an expansion device, is used in
Options- A. domestic refrigerators
- B. water coolers
- C. room air conditioners
- D. all of these Discuss
- 10. Which of the following statement is wrong?
Options- A. The performance of the vapour compression refrigerator varies considerably with both vaporising and condensing temperatures.
- B. In vapour compression cycle, the useful part of the heat transfer is at the condenser.
- C. In ammonia-hydrogen (electolux) refrigerator, no compressor, pump or fan is required.
- D. The effect of under-cooling the liquid refrigerant is to decrease the coefficient of performance. Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: lower
Correct Answer: do not move actually
Correct Answer: ammonia
Correct Answer: between compressor and condenser
Correct Answer: -75.2°C
Correct Answer:
Correct Answer: condenser to the evaporator
Correct Answer: cooling and dehumidification
Correct Answer: all of these
Correct Answer: The effect of under-cooling the liquid refrigerant is to decrease the coefficient of performance.
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