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

  • Which of the following refrigerant is highly toxic and flammable?


  • Options
  • A. Ammonia
  • B. Carbon dioxide
  • C. Sulphur dioxide
  • D. R-12

  • Correct Answer
  • Ammonia 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 4. The wet bulb temperature at 100% relative humidity is __________ dry bulb temperature.

    • Options
    • A. same as
    • B. lower than
    • C. higher than
      • Discuss
    • 5. 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
    • 6. The most commonly used method for the design of duct size is the

    • Options
    • A. velocity reduction method
    • B. equal friction method
    • C. static regain method
    • D. dual or double method
      • Discuss
    • 7. The undesireable property of a refrigerant is

    • Options
    • A. non-toxic
    • B. non-flammable
    • C. non-explosive
    • D. high boiling point
      • Discuss
    • 8. The expression Q = ? AT4 is called

    • Options
    • A. Fourier equation
    • B. Stefan-Boltzmann equation
    • C. Newton-Rikhmann equation
    • D. Joseph-Stefan equation
      • Discuss
    • 9. In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about

    • Options
    • A. 1
    • B. 1.25
    • C. 2.15
    • D. 5.12
      • Discuss
    • 10. The heating of air, without any change in its specific humidity, is known as sensible heating.

    • Options
    • A. True
    • B. False
      • Discuss

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