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Chemical Engineering :: Chemical Engineering Thermodynamics

  1. A change in state involving a decrease in entropy can be spontaneous, only if

  2. A.
    it is exothermic.
    B.
    it is isenthalpic.
    C.
    it takes place isothermally.
    D.
    it takes place at constant volume.

  3. __________ calorimeter is normally used for measuring the dryness fraction of steam, when it is very low.

  4. A.
    Bucket
    B.
    Throttling
    C.
    Separating
    D.
    A combination of separating & throttling

  5. The amount of heat required to decompose a compound into its elements is __________ the heat of formation of that compound from its elements.

  6. A.
    less than
    B.
    more than
    C.
    same as
    D.
    not related to

  7. For a constant volume process

  8. A.
    dE = CpdT
    B.
    dE = CvdT
    C.
    dQ = dE + pdV
    D.
    dW = pdV

  9. In case of the decomposition of hydroiodic acid (2HI H2 + I2), addition of H2 (at equilibrium condition) will

  10. A.
    increase the partial pressure of I2.
    B.
    decrease the partial pressure of HI.
    C.
    diminish the degree of dissociation of HI.
    D.
    none of these.

  11. In any spontaneous process, the __________ free energy decreases.

  12. A.
    Helmholtz
    B.
    Gibbs
    C.
    both a & b
    D.
    neither 'a' nor 'b'

  13. The gas law (PV = RT) is true for an __________ change.

  14. A.
    isothermal
    B.
    adiabatic
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

  15. The equation DU = Tds - PdV is applicable to infinitesimal changes occuring in

  16. A.
    an open system of constant composition.
    B.
    a closed system of constant composition.
    C.
    an open system with changes in composition.
    D.
    a closed system with changes in composition.

  17. Heat is added at constant temperature in an ideal __________ cycle.

  18. A.
    Stirling
    B.
    Brayton
    C.
    Rankine
    D.
    none of these

  19. Pick out the correct equation relating 'F' and 'A'.

  20. A.
    F = A + PV
    B.
    F = E + A
    C.
    F = A - TS
    D.
    F = A + TS