Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
The operating pressure for refrigerating units using R-12 as a refrigerant is
Options- A. 2 bar
- B. 8 bar
- C. 15 bar
- D. 30 bar
- Correct Answer
- 8 bar
- 1. The boiling point of __________ is -10.5°C.
Options- A. ammonia
- B. R-12
- C. sulphur dioxide
- D. carbon dioxide Discuss
- 2. The process of adding moisture to the air, without change in its dry bulb temperature, is known as humidification.
Options- A. Agree
- B. Disagree Discuss
- 3. The specific humidity during heating and humidification process.
Options- A. remains constant
- B. increases
- C. decreases Discuss
- 4. The minimum temperature to which water can be cooled in a cooling tower is
Options- A. dew point temperature of air
- B. wet bulb temperature of air
- C. dry bulb temperature of air
- D. ambient air temperature Discuss
- 5. In case of liquids and gases, the heat transfer takes place according to
Options- A. conduction
- B. convection
- C. radiation
- D. none of these Discuss
- 6. The super-heating in a refrigeration cycle
Options- A. does not alter C.O.P.
- B. increases C.O.P.
- C. decreases C.O.P.
- D. none of these Discuss
- 7. The C.O.P. of a Carnot refrigerator in winter will be __________ as compared to C.O.P. in summer.
Options- A. same
- B. lower
- C. higher Discuss
- 8. The thermostatic expansion valve operates on the changes in the
Options- A. degree of superheat at exit from the evaporator
- B. temperature of the evaporator
- C. pressure in the evaporator
- D. none of the above Discuss
- 9. According to Prevost's theory of exchanges, every body irrespective of its temperature continuously emit heat radiations to the surrounding bodies and at the same time receives heat radiations from the surrounding bodies.
Options- A. True
- B. False Discuss
- 10. The superheated vapour region, in a pressure enthalpy chart, is represented by the space
Options- A. to the left of saturated liquid line
- B. to the right of saturated liquid line
- C. between the saturated liquid line and saturated vapour line
- D. none of the above Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: sulphur dioxide
Correct Answer: Agree
Correct Answer: increases
Correct Answer: wet bulb temperature of air
Correct Answer: convection
Correct Answer: decreases C.O.P.
Correct Answer: higher
Correct Answer: degree of superheat at exit from the evaporator
Correct Answer: True
Correct Answer: between the saturated liquid line and saturated vapour line
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