Heat Transfer, Refrigeration and Air Conditioning problems
- 1. Conduction is the process of heat transfer from one particle of the body to another by the actual motion of the heated particles.
Options- A. True
- B. False Discuss
Correct Answer: False
- 2. If the condenser temperature is kept constant, the coefficient of performance of a refrigeration cycle increases with the increase in evaporator temperature.
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
- 3. When ? is absorptivity, ? is reflectivity and ? is transmittivity, then for a diathermanous body,
Options- A. ? = 1, ? = 0 and ? = 0
- B. ? = 0, ? = 1 and ? = 0
- C. ? = 0, ? = 0 and ? = 1
- D. ? + ? = 1 and ? = 0 Discuss
Correct Answer: ? + ? = 1 and ? = 0
- 4. The central air conditioning system has __________ overall efficiency as compared to individual systems.
Options- A. same
- B. lower
- C. higher Discuss
Correct Answer: higher
- 5. Logarithmic mean temperature difference is the same as the arithmetic mean temperature difference.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Disagree
- 6. A refrigerant with the highest critical pressure is
Options- A. R-11
- B. R-12
- C. R-22
- D. Ammonia Discuss
Correct Answer: Ammonia
- 7. The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and
Options- A. carbon dioxide
- B. sulphur dioxide
- C. lithium bromide
- D. R-12 Discuss
Correct Answer: lithium bromide
- 8. The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as
Options- A. Wien's law
- B. Stefan's law
- C. Kirchhoff's law
- D. Planck's law Discuss
Correct Answer: Kirchhoff's law
- 9. The leakage in a refrigeration system using freon is detected by
Options- A. halide torch
- B. sulphur sticks
- C. soap and water
- D. all of these Discuss
Correct Answer: halide torch
- 10. Most air cooled condensers are designed to operate with a temperature difference of
Options- A. 5°C
- B. 8°C
- C. 14°C
- D. 22°C Discuss
Correct Answer: 14°C
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