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

  • The sulphur sticks, in case of leakage of ammonia refrigerant, gives white smoke.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • True 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. Which of the following statement is correct?

    • Options
    • A. A grey body is one which absorbs all radiations incident on it.
    • B. At thermal equilibrium, the emissivity and absorptivity are same.
    • C. The energy absorbed by a body to the total energy falling on it, is called emissivity.
    • D. A perfect body is one which is black in colour.
      • Discuss
    • 2. Bell-Coleman cycle is a

    • Options
    • A. reversed Carnot cycle
    • B. reversed Otto cycle
    • C. reversed Joule cycle
    • D. reversed Rankine cycle
      • Discuss
    • 3. The horizontal and uniformly spaced lines on a psychrometric chart indicates relative humidity.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 4. The sensible heat factor during the heating and humidification process is given by (where h1 = Enthalpy of air entering the heating coil, h2 = Enthalpy of air leaving the heating coil, and hA = Enthalpy of air at the end of humidification process)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 5. The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number)n, where n is equal to

    • Options
    • A. -1/3
    • B. -2/3
    • C. 1
    • D. -1
      • Discuss
    • 6. The transfer of heat from one body to another takes place only when there is a temperature difference between the bodies.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 7. During gas charging in an ammonia vapour compression system, the connection is made at the compressor outlet.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 8. The water, alcohol and ammonia have same refrigerating effect at different altitudes.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 9. The wet bulb temperature at 100% relative humidity is __________ dew point temperature.

    • Options
    • A. same as
    • B. lower than
    • C. higher than
      • Discuss
    • 10. Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ? = Density of substance, S = Specific heat, and k = Thermal conductivity)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss

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