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

  • The relative humidity is defined as


  • Options
  • A. the mass of water vapour present in 1 m3 of dry air
  • B. the mass of water vapour present in 1 kg of dry air
  • C. the ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure.
  • D. the ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure

  • Correct Answer
  • the ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. Nusselt number (NN) is given by

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 2. The wet bulb temperature lines, on the psychrometric chart, are curved lines.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. The difference between dry bulb temperature and wet bulb temperature, is called

    • Options
    • A. dry bulb depression
    • B. wet bulb depression
    • C. dew point depression
    • D. degree of saturation
      • Discuss
    • 4. While designing the refrigeration system of an aircraft, the prime consideration is that the

    • Options
    • A. system has high C.O.P.
    • B. power per TR is low
    • C. mass of refrigerant circulated in the system is low
    • D. mass of the refrigeration equipment is low
      • Discuss
    • 5. A perfect black body is one which

    • Options
    • A. is black in colour
    • B. absorbs heat radiations of all wave lengths falling on it
    • C. reflects all the heat radiations
    • D. transmits the heat radiations
      • Discuss
    • 6. In a refrigerating machine, heat rejected is __________ heat absorbed.

    • Options
    • A. equal to
    • B. less than
    • C. greater than
      • Discuss
    • 7. In aqua-ammonia and Lithium-bromide water absorption refrigeration systems, the refrigerants are respectively

    • Options
    • A. water and water
    • B. water and lithium bromide
    • C. ammonia and lithium bromide
    • D. ammonia and water
      • Discuss
    • 8. The total radiation from a black body per second per unit area is __________ fourth power of the absolute temperature. This statement is known as Stefan-Boltzmann law.

    • Options
    • A. equal to
    • B. directly proportional to
    • C. inversely proportional to
      • Discuss
    • 9. According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)

    • Options
    • A. Pb = pa - pv
    • B. Pb = pa + pv
    • C. Pb = pa x pv
    • D. Pb = pa/pv
      • Discuss
    • 10. During a refrigeration cycle, heat is rejected by the refrigerant in a

    • Options
    • A. compressor
    • B. condenser
    • C. evaporator
    • D. expansion valve
      • Discuss

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