Heat Transfer, Refrigeration and Air Conditioning problems
- 1. 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
Correct Answer: discharge pressure
- 2. For unsaturated air, the dew point temperature is __________ wet bulb temperature.
Options- A. equal to
- B. less than
- C. more than Discuss
Correct Answer: less than
- 3. 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
Correct Answer: ensures the evaporator completely filled with refrigerant of the load
- 4. The inclined and non-uniformly spaced straight lines on a psychrometric chart indicates wet bulb temperature.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 5. The C.O.P. of a heat pump working on a reversed Carnot cycle is
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 6. The operating temperature of a cold storage is - 2° C. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40° C. The actual C.O.P. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. The power required to drive the plant is
Options- A. 1.86 kW
- B. 3.72 kW
- C. 7.44 kW
- D. 18.6 kW Discuss
Correct Answer: 18.6 kW
- 7. The dry bulb temperature lines, on the psychrometric chart are
Options- A. vertical and uniformly spaced
- B. horizontal and uniformly spaced
- C. horizontal and non-uniformly spaced
- D. curved lines Discuss
Correct Answer: vertical and uniformly spaced
- 8. The temperature rise, between the condenser outlet and expansion valve in ammonia vapour compression system, should be as low as possible.
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
- 9. The refrigerant carbon dioxide is not widely used because of its __________ power require ments per tonne of refrigeration and high operating pressures.
Options- A. low
- B. high Discuss
Correct Answer: high
- 10. The total pressure exerted by the mixture of air and water vapour is equal to the sum of pressures which each constituent would exert, if it occupied the same space by itself. This statement is called
Options- A. Kinetic theory of gases
- B. Newton's law of gases
- C. Dalton's law of partial pressures
- D. Avogadro's hypothesis Discuss
Correct Answer: Dalton's law of partial pressures
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