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

  • A vapour absorption refrigeration system


  • Options
  • A. gives noisy operation
  • B. gives quiet operation
  • C. requires little power consumption
  • D. cools below 0° C

  • Correct Answer
  • gives quiet operation 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. Wet bulb temperature indicates the moisture content in air.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 2. The drier in a refrigeration system removes moisture in the system.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 3. For a given dry bulb temperature, as the relative humidity __________ the wet bulb temperature will increase.

    • Options
    • A. increases
    • B. decreases
      • Discuss
    • 4. In counter-current flow heat exchanger, the logarithmic temperature difference between the fluids is __________ as compared to parallel flow heat exchanger.

    • Options
    • A. same
    • B. less
    • C. greater
      • Discuss
    • 5. Pressure of water vapour is given by

    • Options
    • A.
    • B.
    • C.
    • D. none of these
      • Discuss
    • 6. The relative humidity lines on a psychrometric chart are

    • Options
    • A. vertical and uniformly spaced
    • B. horizontal and uniformly spaced
    • C. horizontal and non-uniformly spaced
    • D. curved lines
      • Discuss
    • 7. A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100° C and leaves at 60° C. A cold fluid enters the heat exchanger at 40° C. The mean temperature difference between the two fluids is

    • Options
    • A. 20°C
    • B. 40°C
    • C. 60°C
    • D. 66.7°C
      • Discuss
    • 8. The value of the wave length for maximum emissive power is given by

    • Options
    • A. Kirchhoff's law
    • B. Stefan's law
    • C. Wein's law
    • D. Planck's law
      • Discuss
    • 9. The __________ point of ammonia is -77.7°C.

    • Options
    • A. freezing
    • B. boiling
      • Discuss
    • 10. Environmental protection agencies advice against the use of chloro-fluoro-carbon refrigerants since

    • Options
    • A. these react with water vapour and cause acid rain
    • B. these react with plants and cause green-house effect
    • C. these react with oxygen and cause its depletion
    • D. these react with ozone layer
      • Discuss

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