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Chemical Engineering :: Chemical Engineering Thermodynamics

  1. Which of the following is not a reversible process ?

  2. A.
    Expansion of an ideal gas against constant pressure.
    B.
    Atmospheric pressure vaporisation of water at 100°C.
    C.
    Solution of NaCl in water at 50°C.
    D.
    None of these.

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  3. Pick out the wrong statement.

  4. A.
    A closed system does not permit exchange of mass with its surroundings but may permit exchange of energy.
    B.
    An open system permits exchange of both mass and energy with its surroundings.
    C.
    The term microstate is used to characterise an individual, whereas macro-state is used to designate a group of micro-states with common characteristics.
    D.
    none of the above.

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  5. Which of the following exemplifies an adiabatic process ?

  6. A.
    Melting of ice.
    B.
    Condensation of alcohol vapor.
    C.
    Sudden bursting of a cycle tube.
    D.
    Evaporation of water.

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  7. Entropy, which is a measure of the disorder of a system is

  8. A.
    independent of pressure.
    B.
    independent of temperature.
    C.
    zero at absolute zero temperature for a perfect crystalline substance.
    D.
    all (a), (b) & (c)

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  9. Critical temperature is defined as the temperature above which a gas will

  10. A.
    not liquify (barring exceptions).
    B.
    immediately liquify.
    C.
    never liquify however high the pressure may be.
    D.
    none of these.

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  11. The standard Gibbs free energy change of a reaction depends on the equilibrium

  12. A.
    pressure
    B.
    temperature
    C.
    composition
    D.
    all (a), (b) and (c)

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  13. Gibbs-Duhem equation relates composition in liquid phase and the __________ at constant temperature & pressure.

  14. A.
    fugacity
    B.
    partial pressure
    C.
    activity co-efficient
    D.
    (a), (b), and (c)

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  15. In an ideal solution, the activity of a component equals its

  16. A.
    mole fraction.
    B.
    fugacity at the same temperature and pressure.
    C.
    partial pressure.
    D.
    none of these.

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  17. A gas has a volume of 27.3 c.c. at 0°C. Its volume at 10°C (if pressure remains unchanged) will be __________ c.c.

  18. A.
    2.73
    B.
    28.3
    C.
    273
    D.
    283

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  19. Clayperon equation deals with the

  20. A.
    rate of change of vapour pressure with temperature.
    B.
    effect of an inert gas on vapour pressure.
    C.
    calculation of ΔF for spontaneous phase change.
    D.
    temperature dependence of heat of phase transition.

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