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Heat Transfer, Refrigeration and Air Conditioning problems

  • 1. The rate of heat flow through a body is Mechanical Engineering Heat Transfer, Refrigeration and Air Conditioning: The rate of heat flow through a body is. The term Mechanical Engineering Heat Transfer, Refrigeration and Air Conditioning: The rate of heat flow through a body is is known as temperature gradient.

  • Options
  • A. Yes
  • B. No
    • Discuss
  • 2. The dehumidification process, on the psychrometric chart, is shown by

  • Options
  • A. horizontal Sine
  • B. vertical line
  • C. inclined line
  • D. curved line
    • Discuss
  • 3. The transfer of heat by molecular collision is known as

  • Options
  • A. conduction
  • B. convection
  • C. radiation
  • D. none of these
    • Discuss
  • 4. 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
  • 5. During sensible cooling of air, the relative humidity increases.

  • Options
  • A. Yes
  • B. No
    • Discuss
  • 6. Wein's law states that the wave length corresponding to __________ is proportional to the absolute temperature.

  • Options
  • A. minimum energy
  • B. maximum energy
    • Discuss
  • 7. The coefficient of performance of vapour compression refrigeration system is quite __________ as compared to air refrigeration system.

  • Options
  • A. low
  • B. high
    • Discuss
  • 8. 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
  • 9. The wet bulb temperature at 100% relative humidity is __________ dry bulb temperature.

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

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss

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