Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
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
- Correct Answer
- vertical and uniformly spaced
- 1. 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
- 2. The C.O.P. of a heat pump working on a reversed Carnot cycle is
Options- A.
- B.
- C.
- D.
Discuss
- 3. The inclined and non-uniformly spaced straight lines on a psychrometric chart indicates wet bulb temperature.
Options- A. Agree
- B. Disagree Discuss
- 4. 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
- 5. For unsaturated air, the dew point temperature is __________ wet bulb temperature.
Options- A. equal to
- B. less than
- C. more than Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative humidity)
Options- A. 25°C DBT and 100% RH
- B. 20°C DBT and 80% RH
- C. 22°C DBT and 60% RH
- D. 25°C DBT and 40% RH Discuss
- 10. A low wet bulb temperature indicates very __________ humidity.
Options- A. low
- B. high Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: 18.6 kW
Correct Answer:
Correct Answer: Agree
Correct Answer: ensures the evaporator completely filled with refrigerant of the load
Correct Answer: less than
Correct Answer: Yes
Correct Answer: high
Correct Answer: Dalton's law of partial pressures
Correct Answer: 22°C DBT and 60% RH
Correct Answer: low
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