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Chemical Engineering :: Chemical Engineering Thermodynamics

  1. The enthalpy change when ammonia gas is dissolved in water is called the heat of

  2. A.
    solution
    B.
    formation
    C.
    dilution
    D.
    combustion

  3. Adiabatic compression of a saturated water vapour makes it

  4. A.
    supersaturated
    B.
    superheated
    C.
    both (a) and (b)
    D.
    neither (a) nor (b)

  5. For a multicomponent system, the term chemical potential is equivalent to the

  6. A.
    molal concentration difference.
    B.
    molar free energy.
    C.
    partial molar free energy.
    D.
    molar free energy change.

  7. The change in Gibbs freee energy for vaporisation of a pure substance is

  8. A.
    positive
    B.
    negative
    C.
    zero
    D.
    may be positive or negative

  9. Critical compressibility factor for all substances

  10. A.
    are more or less constant (vary from 0.2 to 0.3).
    B.
    vary as square of the absolute temperature.
    C.
    vary as square of the absolute pressure.
    D.
    none of these.

  11. For a given substance at a specified temperature, activity is __________ to fugacity.

  12. A.
    directly proportional
    B.
    inversely proportional
    C.
    equal
    D.
    none of these

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

  14. 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.

  15. For water at 300°C, it has a vapour pressure 8592.7 kPa and fugacity 6738.9 kPa Under these conditions, one mole of water in liquid phase has a volume of 25.28 cm3 and that in vapour phase in 391.1 cm3.Fugacity of water (in kPa) at 9000 kPa will be

  16. A.
    6738.9
    B.
    6753.5
    C.
    7058.3
    D.
    9000

  17. __________ equation predicts the activity co-efficient from experimental data.

  18. A.
    Lewis-Randall
    B.
    Margules
    C.
    Van Laar
    D.
    both(b)&(c)

  19. As the temperature is lowered towards the absolute zero, the value of the quantity approaches

  20. A.
    zero
    B.
    unity
    C.
    infinity
    D.
    none of these