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

  • 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)

  • Correct Answer
  • sum of (a) and (b) 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. The specific humidity during cooling and dehumidification

    • Options
    • A. remains constant
    • B. increases
    • C. decreases
      • Discuss
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. The overall coefficient of heat transfer is used in problems of

    • Options
    • A. conduction
    • B. convection
    • C. radiation
    • D. conduction and convection
      • Discuss
    • 8. The fluids used in electrolux refrigerator are

    • Options
    • A. water and hydrogen
    • B. ammonia and hydrogen
    • C. ammonia, water and hydrogen
    • D. none of these
      • Discuss
    • 9. The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called

    • Options
    • A. sub-cooling or under-cooling
    • B. super-cooling
    • C. normal cooling
    • D. none of these
      • Discuss
    • 10. In a parallel flow heat exchanger, the rate of flow of heat and the rate of decrease of temperature are maximum.

    • Options
    • A. Yes
    • B. No
      • Discuss

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