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

  • The wave length of the radiation emitted depends only on the temperature and is independent of the material of the body.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • True 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. The temperature of air recorded by a thermometer, when it is not effected by the moisture present in the air, is called

    • Options
    • A. wet bulb temperature
    • B. dry bulb temperature
    • C. dew point temperature
    • D. none of these
      • Discuss
    • 2. R-12 has the __________ freezing point.

    • Options
    • A. lowest
    • B. highest
      • Discuss
    • 3. The process of undercooling is generally brought about by

    • Options
    • A. circulating more quantity of cooling water through the condenser
    • B. using water colder than the main circulating water
    • C. employing a heat exchanger
    • D. any one of the above
      • Discuss
    • 4. In a pressure enthalpy chart, the space to the left of the saturated liquid line represents

    • Options
    • A. wet vapour region
    • B. superheated vapour region
    • C. sub-cooled liquid region
    • D. none of these
      • Discuss
    • 5. During heating and dehumidification process, dry bulb temperature

    • Options
    • A. remains constant
    • B. increases
    • C. decreases
      • Discuss
    • 6. A condenser is used in the __________ pressure side of a refrigerating system.

    • Options
    • A. low
    • B. high
      • Discuss
    • 7. The temperature of air recorded by a thermometer, when the moisture present in it begins to condense, is called wet bulb temperature.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 8. In figure shown, E is a heat engine with efficiency of 0.4 and R is a refrigerator. It is given that Q2 + Q4 = 3Q1. The C.O.P. of the refrigerator is

    • Options
    • A. 2.5
    • B. 3.0
    • C. 4.0
    • D. 5.0
      • Discuss
    • 9. The leakage in a refrigeration system using ammonia is detected by

    • Options
    • A. halide torch
    • B. sulphur sticks
    • C. soap and water
    • D. all of these
      • Discuss
    • 10. During sensible cooling,

    • Options
    • A. relative humidity remains constant
    • B. wet bulb temperature increases
    • C. specific humidity increases
    • D. partial pressure of vapour remains constant
      • Discuss

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