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Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
  • Question

  • A refrigerant with the highest critical pressure is


  • Options
  • A. R-11
  • B. R-12
  • C. R-22
  • D. Ammonia

  • Correct Answer
  • Ammonia 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. Logarithmic mean temperature difference is the same as the arithmetic mean temperature difference.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 2. The central air conditioning system has __________ overall efficiency as compared to individual systems.

    • Options
    • A. same
    • B. lower
    • C. higher
      • Discuss
    • 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
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. A device used for transfering heat from one fluid to another is called heat exchanger.

    • Options
    • A. True
    • B. False
      • Discuss

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