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

  • The coefficient of performance of vapour compression refrigeration system is quite __________ as compared to air refrigeration system.


  • Options
  • A. low
  • B. high

  • Correct Answer
  • high 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. Wein's law states that the wave length corresponding to __________ is proportional to the absolute temperature.

    • Options
    • A. minimum energy
    • B. maximum energy
      • Discuss
    • 2. During sensible cooling of air, the relative humidity increases.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 3. A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h1, h2 and h3 respectively. The average heat transfer coefficient for the cube is

    • Options
    • A. h1 + h2 + h3
    • B. (h1h2h3)1/3
    • C.
    • D. none of these
      • Discuss
    • 4. The transfer of heat by molecular collision is known as

    • Options
    • A. conduction
    • B. convection
    • C. radiation
    • D. none of these
      • Discuss
    • 5. The dehumidification process, on the psychrometric chart, is shown by

    • Options
    • A. horizontal Sine
    • B. vertical line
    • C. inclined line
    • D. curved line
      • Discuss
    • 6. In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = By-pass factor)

    • Options
    • A. B.P.F. - 1
    • B. 1 - B.P.F.
    • C.
    • D. 1 + B.RF.
      • Discuss
    • 7. The wet bulb temperature at 100% relative humidity is __________ dry bulb temperature.

    • Options
    • A. same as
    • B. lower than
    • C. higher than
      • Discuss
    • 8. Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 9. The horizontal and non-uniformly spaced lines on a psychrometric chart indicates

    • Options
    • A. dry bulb temperature
    • B. wet bulb temperature
    • C. dew point temperature
    • D. specific humidity
      • Discuss
    • 10. In order to cool and dehumidify a stream of moist air, it must be passed over the coil at a temperature

    • Options
    • A. which lies between the dry bulb and wet bulb temperatures of the incoming stream
    • B. which lies between the wet bulb and dew point temperatures of the incoming stream
    • C. which is lower than the dew point temperature of the incoming stream
    • D. of adiabatic saturation of incoming stream
      • Discuss

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