Menu
Home / Mechanical Engineering / Refrigeration and Air Conditioning :: section-1

Mechanical Engineering :: Refrigeration and Air Conditioning

Refrigeration and Air Conditioning - section-1
  1. During cooling and dehumidification, dry bulb temperature

    2. A.

     Remains constant
    B.

     Increases
    C.

     Decreases
    D.

     None of these

    View Answer

    Workspace

    Discuss Discuss in Forum

  2. In a domestic vapour compression refrigerator, the refrigerant commonly used is

    3. A.

     CO?
    B.

     Ammonia
    C.

     R-12
    D.

     All of these

    View Answer

    Workspace

    Discuss Discuss in Forum

  3. In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be

    4. A.

     High, of the order of 25°
    B.

     As low as possible (3 to 11°C)
    C.

     Zero
    D.

     Any value

    View Answer

    Workspace

    Discuss Discuss in Forum

  4. The minimum temperature to which water can be cooled in a cooling tower is

    5. A.

     Dew point temperature of air
    B.

     Wet bulb temperature of air
    C.

     Dry bulb temperature of air
    D.

     Ambient air temperature

    View Answer

    Workspace

    Discuss Discuss in Forum

  5. Air refrigeration cycle is used in

    6. A.

     Domestic refrigerators
    B.

     Commercial refrigerators
    C.

     Air conditioning
    D.

     Gas liquefaction

    View Answer

    Workspace

    Discuss Discuss in Forum

  6. The value of C.O.P in vapour compression cycle is usually

    7. A.

     Always less than unity
    B.

     Always more than unity
    C.

     Equal to unity
    D.

     Any one of the above

    View Answer

    Workspace

    Discuss Discuss in Forum

  7. The specific humidity during cooling and dehumidification

    8. A.

     Remains constant
    B.

     Increases
    C.

     Decreases
    D.

     None of these

    View Answer

    Workspace

    Discuss Discuss in Forum

  8. The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is

    9. A.

     Bigger
    B.

     Smaller
    C.

     Equal
    D.

     Smaller/bigger depending on capacity

    View Answer

    Workspace

    Discuss Discuss in Forum

  9. In a vapour compression refrigeration system, a throttle valve is used in place of an expander because

    10. A.

     It considerably reduces mass of the system
    B.

     It improves the C.O.P., as the condenser is small
    C.

     The positive work in isentropic expansion of liquid is very small
    D.

     It leads to significant cost reduction

    View Answer

    Workspace

    Discuss Discuss in Forum

  10. In a refrigeration system, heat absorbed in comparison to heat rejected is

    11. A.

     More
    B.

     Less
    C.

     Same
    D.

     More for small capacity and less for high capacity

    View Answer

    Workspace

    Discuss Discuss in Forum

Java Programming Questions and Answers Interview Questions and Answers