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

  • 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

  • Correct Answer
  • sulphur sticks 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. A condenser is used in the __________ pressure side of a refrigerating system.

    • Options
    • A. low
    • B. high
      • Discuss
    • 4. 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
      • Discuss
    • 5. 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
    • 6. 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
    • 7. The specific humidity during cooling and dehumidification

    • Options
    • A. remains constant
    • B. increases
    • C. decreases
      • Discuss
    • 8. A human body feels comfortable when the heat produced by the metabolism of human body is equal to the

    • Options
    • A. heat dissipated to the surroundings
    • B. heat stored in the human body
    • C. sum of (a) and (b)
    • D. difference of (a) and (b)
      • Discuss
    • 9. During heating and humidification, the final relative humidity of air

    • Options
    • A. is higher than that of the entering air
    • B. is lower than that of the entering air
    • C. can be lower or higher than that of the entering air
    • D. none of the above
      • Discuss
    • 10. The overall coefficient of heat transfer is used in problems of

    • Options
    • A. conduction
    • B. convection
    • C. radiation
    • D. conduction and convection
      • Discuss

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