Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
In case of liquids and gases, the heat transfer takes place according to
Options- A. conduction
- B. convection
- C. radiation
- D. none of these
- Correct Answer
- convection
- 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
- 2. Which of the following statement is correct?
Options- A. The human body can lose heat even if its temperature is less than the atmospheric temperature.
- B. The increase in air movement increases the evaporation from the human body.
- C. The warm air increases the rate of radiation of heat from the human body.
- D. both (a) and (b) Discuss
- 3. The condition of refrigerant as it leaves the compressor in a vapour compression system is
Options- A. saturated liquid
- B. wet vapour
- C. dry saturated vapour
- D. superheated vapour Discuss
- 4. In a vapour compression system, the condition of refrigerant before entering the expansion or throttle valve is
Options- A. high pressure saturated liquid
- B. wet vapour
- C. very wet vapour
- D. dry vapour Discuss
- 5. The condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression system is
Options- A. high pressure saturated liquid
- B. wet vapour
- C. very wet vapour
- D. dry vapour Discuss
- 6. 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
- 7. The specific humidity during heating and humidification process.
Options- A. remains constant
- B. increases
- C. decreases Discuss
- 8. 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
- 9. The boiling point of __________ is -10.5°C.
Options- A. ammonia
- B. R-12
- C. sulphur dioxide
- D. carbon dioxide Discuss
- 10. 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
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: all of these
Correct Answer: both (a) and (b)
Correct Answer: superheated vapour
Correct Answer: high pressure saturated liquid
Correct Answer: very wet vapour
Correct Answer: wet bulb temperature of air
Correct Answer: increases
Correct Answer: Agree
Correct Answer: sulphur dioxide
Correct Answer: 8 bar
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