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

  • The unit of overall coefficient of heat transfer is


  • Options
  • A. W/m2K
  • B. W/m2
  • C. W/mK
  • D. W/m

  • Correct Answer
  • W/m2K 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. The ratio of actual heat transfer to the maximum possible heat transfer is known as heat exchanger effectiveness.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 2. The lowest thermal diffusivity is of

    • Options
    • A. iron
    • B. lead
    • C. aluminium
    • D. rubber
      • Discuss
    • 3. Sulphur dioxide has the lowest boiling point.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 4. A simple air cooling system is good for __________ flight speeds.

    • Options
    • A. low
    • B. high
      • Discuss
    • 5. In a psychrometric chart, dew point temperature lines are horizontal and non-uniformly spaced.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 6. The mass of water vapour present in 1 kg of dry air, is called humidity ratio.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. The refrigerant widely used in domestic refrigerators is

    • Options
    • A. ammonia
    • B. carbon dioxide
    • C. sulphur dioxide
    • D. R-12
      • Discuss
    • 8. R-12 is generally preferred over R-22 in deep freezers since

    • Options
    • A. it has low operating pressures
    • B. it gives higher coefficient of performance
    • C. it is miscible with oil over large range of temperatures
    • D. all of the above
      • Discuss
    • 9. An infinite parallel planes with emissivities e1 and e2, the interchange factor for radiation from surface 1 to surface 2 is given by

    • Options
    • A.
    • B.
    • C. e1 + e2
    • D. e1e2
      • Discuss
    • 10. Hydrogen is used in electrolux refrigeration system so as to __________ the rate of evaporation of the liquid ammonia passing through the evaporator.

    • Options
    • A. equalise
    • B. reduce
    • C. increase
      • Discuss

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