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

  • The relative humidity __________ as air gets drier.


  • Options
  • A. increases
  • B. decreases

  • Correct Answer
  • increases 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. A device used for transfering heat from one fluid to another is called heat exchanger.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. Most air cooled condensers are designed to operate with a temperature difference of

    • Options
    • A. 5°C
    • B. 8°C
    • C. 14°C
    • D. 22°C
      • Discuss
    • 3. The leakage in a refrigeration system using freon is detected by

    • Options
    • A. halide torch
    • B. sulphur sticks
    • C. soap and water
    • D. all of these
      • Discuss
    • 4. The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

    • Options
    • A. Wien's law
    • B. Stefan's law
    • C. Kirchhoff's law
    • D. Planck's law
      • Discuss
    • 5. The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and

    • Options
    • A. carbon dioxide
    • B. sulphur dioxide
    • C. lithium bromide
    • D. R-12
      • Discuss
    • 6. The product of Reynolds number and Prandtl number is known as

    • Options
    • A. Stanton number
    • B. Biot number
    • C. Peclet number
    • D. Grashoff number
      • Discuss
    • 7. The boiling point of ammonia is

    • Options
    • A. -10.5°C
    • B. -30°C
    • C. -33.3°C
    • D. -77.7°C
      • Discuss
    • 8. A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in higher coefficient of performance.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 9. During humidification process, dry bulb temperature

    • Options
    • A. remains constant
    • B. increases
    • C. decreases
      • Discuss
    • 10. The condition of refrigerant after passing through the condenser in a vapour compression system is

    • Options
    • A. saturated liquid
    • B. wet vapour
    • C. dry saturated vapour
    • D. superheated vapour
      • Discuss

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