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Mechanical Engineering :: Refrigeration and Air Conditioning

  1. During a refrigeration cycle, heat is rejected by the refrigerant in a

  2. A.

     Compressor

    B.

     Condenser

    C.

     Evaporator

    D.

     Expansion valve


  3. Freon group of refrigerants are

  4. A.

     Inflammable

    B.

     Toxic

    C.

     Non-inflammable and toxic

    D.

     Nontoxic and non-inflammable


  5. The Freon group of refrigerants are

  6. A.

     Halocarbon refrigerants

    B.

     Zoetrope refrigerants

    C.

     Inorganic refrigerants

    D.

     Hydrocarbon refrigerants


  7. One ton of the refrigeration is

  8. A.

     The standard unit used in refrigeration problems

    B.

     The cooling effect produced by melting 1 ton of ice

    C.

     The refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours

    D.

     The refrigeration effect to produce 1 ton of ice at NTP conditions


  9. The power per tonne of refrigeration is

  10. A.

     3.5/C.O.P.

    B.

     C.O.P/3.5

    C.

     3.5 × C.O.P.

    D.

     None of these


  11. An important characteristic of absorption system of refrigeration is

  12. A.

     noisy operation

    B.

     quiet operation

    C.

     cooling below 0°C

    D.

     very little power consumption


  13. The evaporator used in household refrigerators is

  14. A.

     Frosting evaporator

    B.

     Non-frosting evaporator

    C.

     Defrosting evaporator

    D.

     None of these


  15. Chaperon equation is a relation between

  16. A.

     Temperature, pressure and enthalpy

    B.

     Specific volume and enthalpy

    C.

     Temperature and enthalpy

    D.

     Temperature, pressure, specific volume and enthalpy


  17. If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be

  18. A.

     Same

    B.

     More

    C.

     Less

    D.

     More/less depending on rating


  19. In vapour compression cycle, the condition of refrigerant is saturated liquid

  20. A.

     After passing through the condenser

    B.

     Before passing through the condenser

    C.

     After passing through the expansion throttle valve

    D.

     Before entering the expansion valve