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Chemical Engineering :: Chemical Engineering Thermodynamics

  1. For the reversible exothermic reaction, N2 + 3H2 2NH3, increase of pressure would

  2. A.
    shift the equilibrium towards right.
    B.
    give higher yield of NH3.
    C.
    both (b) and (c).
    D.
    neither (a) nor (b).

  3. Which of the following has the minimum value of COP for a given refrigeration effect?

  4. A.
    Reverse Carnot cycle.
    B.
    Ordinary vapour-compression cycle.
    C.
    Vapour-compression process with a reversible expansion engine.
    D.
    Air refrigeration cycle.

  5. __________ decreases during adiabatic throttling of a perfect gas.

  6. A.
    Entropy
    B.
    Temperature
    C.
    Enthalpy
    D.
    Pressure

  7. Pick out the wrong statement.

  8. A.
    Minimum number of degree of freedom of a system is zero.
    B.
    Degree of freedom of a system containing a gaseous mixture of helium, carbon dioxide and hydrogen is 4.
    C.
    For a two phase system in equilibrium made up of four non-reacting chemical species, the number of degrees of freedom is 4.
    D.
    Enthalpy and internal energy change is zero during phase change processes like melting, vaporisation and sublimation.

  9. Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will

  10. A.
    increase
    B.
    decrease
    C.
    remain unchanged
    D.
    first fall and then rise.

  11. Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the

  12. A.
    calorific value
    B.
    heat of reaction
    C.
    heat of combustion
    D.
    heat of formation

  13. Clausius - Clayperon equation is applicable to __________ equilibrium processes.

  14. A.
    solid-vapor
    B.
    solid-liquid
    C.
    liquid-vapor
    D.
    all (a), (b) and (c)

  15. In which of the following reaction equilibria, the value of equilibrium constant Kp will be more than is Kc ?

  16. A.
    2HI H2 + I2
    B.
    N2O4 2NO2
    C.
    2SO2 + O2 2SO3
    D.
    none of these

  17. After throttling, gas temperature

  18. A.
    decreases
    B.
    increases
    C.
    remains same
    D.
    may increase or decrease ; depends on the nature of the gas

  19. The chemical potential for a pure substance is __________ its partial molal free energy.

  20. A.
    more than
    B.
    less than
    C.
    equal to
    D.
    not related to