Discussion
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- Question
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
- Correct Answer
- Kirchhoff's law
- 1. 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
- 2. A refrigerant with the highest critical pressure is
Options- A. R-11
- B. R-12
- C. R-22
- D. Ammonia Discuss
- 3. Logarithmic mean temperature difference is the same as the arithmetic mean temperature difference.
Options- A. Agree
- B. Disagree Discuss
- 4. The central air conditioning system has __________ overall efficiency as compared to individual systems.
Options- A. same
- B. lower
- C. higher Discuss
- 5. 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
- 6. 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
- 7. 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
- 8. A device used for transfering heat from one fluid to another is called heat exchanger.
Options- A. True
- B. False Discuss
- 9. The relative humidity __________ as air gets drier.
Options- A. increases
- B. decreases Discuss
- 10. The product of Reynolds number and Prandtl number is known as
Options- A. Stanton number
- B. Biot number
- C. Peclet number
- D. Grashoff number Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: lithium bromide
Correct Answer: Ammonia
Correct Answer: Disagree
Correct Answer: higher
Correct Answer: ? + ? = 1 and ? = 0
Correct Answer: halide torch
Correct Answer: 14°C
Correct Answer: True
Correct Answer: increases
Correct Answer: Peclet number
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