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  1. In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in

  2. A.

     Enhanced COP

    B.

     Decreased COP

    C.

     No change in the value of COP

    D.

     Increased or decreased COP ; depending upon the type of refrigerant

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  3. Melting of ice is an example of an __________ process.

  4. A.

     Adiabatic

    B.

     Isothermal

    C.

     Isometric

    D.

     None of these

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  5. Claude's liquefaction process employs the cooling of gases by

  6. A.

     Expansion in an engine

    B.

     Following a constant pressure cycle

    C.

     Throttling

    D.

     None of these

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  7. A domestic refrigerator has a/an __________ cooled condenser.

  8. A.

     Water

    B.

     Air

    C.

     Evaporative

    D.

     Gas

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  9. Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is

  10. A.

     Positive

    B.

     Negative

    C.

     Zero

    D.

     Infinity

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  11. At normal boiling point, molar entropy of vaporisation is __________ Joule/K°.mole.

  12. A.

     72

    B.

     92

    C.

     142

    D.

     192

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  13. PVy = constant, holds good for an isentropic process, which is

  14. A.

     Reversible and isothermal

    B.

     Isothermal and irreversible

    C.

     Reversible and adiabatic

    D.

     Adiabatic and irreversible

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  15. The internal energy of an ideal gas is a function of its __________ only.

  16. A.

     Molecular size

    B.

     Volume

    C.

     Pressure

    D.

     Temperature

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  17. Gibbs free energy at constant pressure and temperature under equilibrium conditions is

  18. A.

     ∞

    B.

     0

    C.

     Maximum

    D.

     Minimum

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  19. Free energy change at equilibrium is

  20. A.

     Zero

    B.

     Positive

    C.

     Negative

    D.

     Indeterminate

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