Heat Transfer, Refrigeration and Air Conditioning problems
- 1. The radiation emitted by a black body is known as
Options- A. black radiation
- B. full radiation
- C. total radiation
- D. all of these Discuss
Correct Answer: all of these
- 2. 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
Correct Answer: convection
- 3. 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
Correct Answer: wet bulb temperature of air
- 4. The specific humidity during heating and humidification process.
Options- A. remains constant
- B. increases
- C. decreases Discuss
Correct Answer: increases
- 5. 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
Correct Answer: Agree
- 6. The boiling point of __________ is -10.5°C.
Options- A. ammonia
- B. R-12
- C. sulphur dioxide
- D. carbon dioxide Discuss
Correct Answer: sulphur dioxide
- 7. 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 Discuss
Correct Answer: 8 bar
- 8. 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
Correct Answer: decreases C.O.P.
- 9. 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
Correct Answer: higher
- 10. 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
Correct Answer: degree of superheat at exit from the evaporator
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