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Home Mechanical Engineering Heat Transfer, Refrigeration and Air Conditioning Comments

  • Question
  • The conditioned air supplied to the room must have the capacity to take up


  • Options
  • A. room sensible heat load only
  • B. room latent heat load only
  • C. both room sensible heat and latent heat loads
  • D. none of the above

  • Correct Answer
  • both room sensible heat and latent heat loads 


  • Heat Transfer, Refrigeration and Air Conditioning problems


    Search Results


    • 1. The natural convection air cooled condensers are used in

    • Options
    • A. domestic refrigerators
    • B. water coolers
    • C. room air conditioners
    • D. all of these
    • Discuss
    • 2. The counter-current flow heat exchanger can transfer __________ heat than parallel flow heat exchanger.

    • Options
    • A. less
    • B. more
    • Discuss
    • 3. Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ? = Density of substance, S = Specific heat, and k = Thermal conductivity)

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

    • Options
    • A. same as
    • B. lower than
    • C. higher than
    • Discuss
    • 5. The water, alcohol and ammonia have same refrigerating effect at different altitudes.

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 6. A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be

    • Options
    • A. lack of cooling water
    • B. water temperature being high
    • C. dirty condenser surface
    • D. all of these
    • Discuss
    • 7. Which of the following would lead to a reduction in thermal resistance?

    • Options
    • A. In conduction, reduction in the thickness of the material and an increase in thermal conductivity.
    • B. In convection, stirring of the fluid and cleaning the heating surface.
    • C. In radiation, increasing the temperature and reducing the emissivity.
    • D. all of the above
    • Discuss
    • 8. The process, generally used in winter air-conditioning to warm and humidity the air, is called

    • Options
    • A. humidification.
    • B. dehumidification
    • C. heating and humidification
    • D. cooling and dehumidification
    • Discuss
    • 9. Which of the following refrigerant has the highest freezing point.

    • Options
    • A. Ammonia
    • B. Carbon dioxide
    • C. Sulphur dioxide
    • D. R-12
    • Discuss
    • 10. In mechanical refrigeration system, the refrigerant occurs as liquid between condenser and expansion valve.

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


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