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

  • Most thermostatic expansion valves are set for a superheat of


  • Options
  • A. 5°C
  • B. 10°C
  • C. 15°C
  • D. 20°C

  • Correct Answer
  • 5°C 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. Air refrigerator works on

    • Options
    • A. reversed Carnot cycle
    • B. Bell Coleman cycle
    • C. both (a) and ib)
    • D. none of these
      • Discuss
    • 2. 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
    • 3. 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
    • 4. The reciprocating refrigerant compressors are very suitable for

    • Options
    • A. small displacements and low condensing pressures
    • B. large displacements and high condensing pressures
    • C. small displacements and high condensing pressures
    • D. large displacements and low condensing pressures
      • Discuss
    • 5. R-11 has the highest critical point temperature.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 6. The boiling point of carbon dioxide is

    • Options
    • A. -20.5°C
    • B. -50°C
    • C. -63.3°C
    • D. -78.3°C
      • Discuss
    • 7. 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
      • Discuss
    • 8. The humidification process, on the psychrometric chart is shown by

    • Options
    • A. horizontal line
    • B. vertical line
    • C. inclined line
    • D. curved line
      • Discuss
    • 9. 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
    • 10. During dehumidification process, the relative humidity

    • Options
    • A. remains constant
    • B. increases
    • C. decreases
      • Discuss

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