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

  • The desirable property of a refrigerant is


  • Options
  • A. low boiling point
  • B. high critical temperature
  • C. high latent heat of vaporisation
  • D. all of these

  • Correct Answer
  • all of these 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. The boiling point of carbon dioxide is

    • Options
    • A. -20.5°C
    • B. -50°C
    • C. -63.3°C
    • D. -78.3°C
      • Discuss
    • 2. Most thermostatic expansion valves are set for a superheat of

    • Options
    • A. 5°C
    • B. 10°C
    • C. 15°C
    • D. 20°C
      • Discuss
    • 3. Air refrigerator works on

    • Options
    • A. reversed Carnot cycle
    • B. Bell Coleman cycle
    • C. both (a) and ib)
    • D. none of these
      • Discuss
    • 4. In a pressure enthalpy chart, the space between the saturated liquid line and saturated vapour line, represents sub-cooled liquid region.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The relative coefficient of performance is equal to

    • Options
    • A.
    • B.
    • C. Actual C.O.P. x Theoretical C.O.P.
    • D. none of these
      • Discuss
    • 6. The humidification process, on the psychrometric chart is shown by

    • Options
    • A. horizontal line
    • B. vertical line
    • C. inclined line
    • D. curved line
      • Discuss
    • 7. The ratio of heat extracted in the refrigerator to the workdone on the refrigerant is called

    • Options
    • A. coefficient of performance of refrigeration
    • B. coefficient of performance of heat pump
    • C. relative coefficient of performance
    • D. refrigerating efficiency
      • Discuss
    • 8. During dehumidification process, the relative humidity

    • Options
    • A. remains constant
    • B. increases
    • C. decreases
      • Discuss
    • 9. The evaporator changes the low pressure liquid refrigerant from the expansion valve into

    • Options
    • A. high pressure liquid refrigerant
    • B. low pressure liquid and vapour refrigerant
    • C. low pressure vapour refrigerant
    • D. none of these
      • Discuss
    • 10. When absorptivity (?) = 1, reflectivity (?) = 0 and transmittivity (?) = 0, then the body is said to be a

    • Options
    • A. black body
    • B. grey body
    • C. opaque body
    • D. white body
      • Discuss

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