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

  • The automobile radiator is a heat exchanger of


  • Options
  • A. parallel flow type
  • B. counter flow type
  • C. cross flow type
  • D. regenerator type

  • Correct Answer
  • cross flow type 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. The wave length corresponding to the maximum energy is inversely proportional to the absolute temperature. This statement is called Planck's law.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 2. A vapour absorption refrigerator uses __________ as a refrigerant.

    • Options
    • A. water
    • B. ammonia
    • C. freon
    • D. aqua-ammonia
      • Discuss
    • 3. The material of pipe lines for a system using ammonia as a refrigerant should be copper.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 4. The curved lines on a psychrometric chart indicates

    • Options
    • A. dry bulb temperature
    • B. wet bulb temperature
    • C. dew point temperature
    • D. relative humidity
      • Discuss
    • 5. During cooling and dehumidification, dry bulb temperature

    • Options
    • A. remains constant
    • B. increases
    • C. decreases
      • Discuss
    • 6. For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference (tm) for parallel flow is __________ that for counter flow.

    • Options
    • A. equal to
    • B. less than
    • C. greater than
      • Discuss
    • 7. For a white body, absorptivity (? ) = 0, reflectivity (?) = 1 and transmittivity (?) = 0.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 8. The use of heat exchangers is made in

    • Options
    • A. radiators in automobile
    • B. condensers and boilers in steam plants
    • C. condensers and evaporators in refrigeration and air conditioning units
    • D. all of the above
      • Discuss
    • 9. The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number)n, where n is equal to

    • Options
    • A. -1/3
    • B. -2/3
    • C. 1
    • D. -1
      • Discuss
    • 10. The sensible heat factor during the heating and humidification process is given by (where h1 = Enthalpy of air entering the heating coil, h2 = Enthalpy of air leaving the heating coil, and hA = Enthalpy of air at the end of humidification process)

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

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