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

  • A thermostatic expansion valve in a refrigeration system


  • Options
  • A. ensures the evaporator completely filled with refrigerant of the load
  • B. is suitable only for constant load systems
  • C. maintains different temperatures in evaporator in proportion to load
  • D. none of the above

  • Correct Answer
  • ensures the evaporator completely filled with refrigerant of the load 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. For unsaturated air, the dew point temperature is __________ wet bulb temperature.

    • Options
    • A. equal to
    • B. less than
    • C. more than
      • Discuss
    • 2. The pressure at the outlet of a refrigerant compressor is called

    • Options
    • A. suction pressure
    • B. discharge pressure
    • C. critical pressure
    • D. back pressure
      • Discuss
    • 3. A mixture of dry air and water vapour, when the air has diffused the maximum amount of water vapour into it, is called

    • Options
    • A. dry air
    • B. moist air
    • C. saturated air
    • D. specific humidity
      • Discuss
    • 4. The by-pass factor, in case of sensible cooling of air, is given by (where td1 = Dry bulb temperature of air entering the cooling coil, td2 = Dry bulb temperature of air leaving the cooling coil, and td3 = Dry bulb temperature of the cooling coil)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 5. Emissivity of a body will be equal to its absorptivity at all temperatures.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 6. The inclined and non-uniformly spaced straight lines on a psychrometric chart indicates wet bulb temperature.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 7. The C.O.P. of a heat pump working on a reversed Carnot cycle is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 8. The operating temperature of a cold storage is - 2° C. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40° C. The actual C.O.P. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. The power required to drive the plant is

    • Options
    • A. 1.86 kW
    • B. 3.72 kW
    • C. 7.44 kW
    • D. 18.6 kW
      • Discuss
    • 9. The dry bulb temperature lines, on the psychrometric chart are

    • Options
    • A. vertical and uniformly spaced
    • B. horizontal and uniformly spaced
    • C. horizontal and non-uniformly spaced
    • D. curved lines
      • Discuss
    • 10. The temperature rise, between the condenser outlet and expansion valve in ammonia vapour compression system, should be as low as possible.

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

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