Heat Transfer, Refrigeration and Air Conditioning problems
- 1. The temperature of air recorded by a thermometer, when it is not effected by the moisture present in the air, is called
Options- A. wet bulb temperature
- B. dry bulb temperature
- C. dew point temperature
- D. none of these Discuss
Correct Answer: dry bulb temperature
- 2. The wave length of the radiation emitted depends only on the temperature and is independent of the material of the body.
Options- A. True
- B. False Discuss
Correct Answer: True
- 3. A condenser is used in the __________ pressure side of a refrigerating system.
Options- A. low
- B. high Discuss
Correct Answer: high
- 4. The temperature of air recorded by a thermometer, when the moisture present in it begins to condense, is called wet bulb temperature.
Options- A. Yes
- B. No Discuss
Correct Answer: No
- 5. In figure shown, E is a heat engine with efficiency of 0.4 and R is a refrigerator. It is given that Q2 + Q4 = 3Q1. The C.O.P. of the refrigerator is
Options- A. 2.5
- B. 3.0
- C. 4.0
- D. 5.0 Discuss
Correct Answer: 5.0
- 6. The leakage in a refrigeration system using ammonia is detected by
Options- A. halide torch
- B. sulphur sticks
- C. soap and water
- D. all of these Discuss
Correct Answer: sulphur sticks
- 7. During sensible cooling,
Options- A. relative humidity remains constant
- B. wet bulb temperature increases
- C. specific humidity increases
- D. partial pressure of vapour remains constant Discuss
Correct Answer: partial pressure of vapour remains constant
- 8. The specific humidity during cooling and dehumidification
Options- A. remains constant
- B. increases
- C. decreases Discuss
Correct Answer: decreases
- 9. A human body feels comfortable when the heat produced by the metabolism of human body is equal to the
Options- A. heat dissipated to the surroundings
- B. heat stored in the human body
- C. sum of (a) and (b)
- D. difference of (a) and (b) Discuss
Correct Answer: sum of (a) and (b)
- 10. During heating and humidification, the final relative humidity of air
Options- A. is higher than that of the entering air
- B. is lower than that of the entering air
- C. can be lower or higher than that of the entering air
- D. none of the above Discuss
Correct Answer: can be lower or higher than that of the entering air
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