Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
The boiling point of carbon dioxide is
Options- A. -20.5°C
- B. -50°C
- C. -63.3°C
- D. -78.3°C
- Correct Answer
- -78.3°C
- 1. Most thermostatic expansion valves are set for a superheat of
Options- A. 5°C
- B. 10°C
- C. 15°C
- D. 20°C Discuss
- 2. Air refrigerator works on
Options- A. reversed Carnot cycle
- B. Bell Coleman cycle
- C. both (a) and ib)
- D. none of these Discuss
- 3. In a pressure enthalpy chart, the space between the saturated liquid line and saturated vapour line, represents sub-cooled liquid region.
Options- A. True
- B. False Discuss
- 4. The relative coefficient of performance is equal to
Options- A.
- B.
- C. Actual C.O.P. x Theoretical C.O.P.
- D. none of these Discuss
- 5. The reciprocating refrigerant compressors are very suitable for
Options- A. small displacements and low condensing pressures
- B. large displacements and high condensing pressures
- C. small displacements and high condensing pressures
- D. large displacements and low condensing pressures Discuss
- 6. The desirable property of a refrigerant is
Options- A. low boiling point
- B. high critical temperature
- C. high latent heat of vaporisation
- D. all of these Discuss
- 7. The humidification process, on the psychrometric chart is shown by
Options- A. horizontal line
- B. vertical line
- C. inclined line
- D. curved line Discuss
- 8. The ratio of heat extracted in the refrigerator to the workdone on the refrigerant is called
Options- A. coefficient of performance of refrigeration
- B. coefficient of performance of heat pump
- C. relative coefficient of performance
- D. refrigerating efficiency Discuss
- 9. During dehumidification process, the relative humidity
Options- A. remains constant
- B. increases
- C. decreases Discuss
- 10. The evaporator changes the low pressure liquid refrigerant from the expansion valve into
Options- A. high pressure liquid refrigerant
- B. low pressure liquid and vapour refrigerant
- C. low pressure vapour refrigerant
- D. none of these Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: 5°C
Correct Answer: both (a) and ib)
Correct Answer: False
Correct Answer:
Correct Answer: small displacements and high condensing pressures
Correct Answer: all of these
Correct Answer: vertical line
Correct Answer: coefficient of performance of refrigeration
Correct Answer: decreases
Correct Answer: low pressure vapour refrigerant
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