Heat Transfer, Refrigeration and Air Conditioning problems
- 1. The space between the two walls of a thermos flask is evacuated because vacuum is a __________ conductor of heat.
Options- A. good
- B. bad Discuss
Correct Answer: bad
- 2. R-11 has the highest critical point temperature.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
- 3. 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
Correct Answer: small displacements and high condensing pressures
- 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
Correct Answer:
- 5. 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
Correct Answer: False
- 6. Air refrigerator works on
Options- A. reversed Carnot cycle
- B. Bell Coleman cycle
- C. both (a) and ib)
- D. none of these Discuss
Correct Answer: both (a) and ib)
- 7. Most thermostatic expansion valves are set for a superheat of
Options- A. 5°C
- B. 10°C
- C. 15°C
- D. 20°C Discuss
Correct Answer: 5°C
- 8. The boiling point of carbon dioxide is
Options- A. -20.5°C
- B. -50°C
- C. -63.3°C
- D. -78.3°C Discuss
Correct Answer: -78.3°C
- 9. 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
Correct Answer: all of these
- 10. The humidification process, on the psychrometric chart is shown by
Options- A. horizontal line
- B. vertical line
- C. inclined line
- D. curved line Discuss
Correct Answer: vertical line
More in Mechanical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.