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Chemical Engineering :: Chemical Engineering Thermodynamics

  1. Third law of thermodynamics is helpful in

  2. A.
    prediction of the extent of a chemical reaction.
    B.
    calculating absolute entropies of substances at different temperature.
    C.
    evaluating entropy changes of chemical reaction.
    D.
    both (b) and (c)

  3. Fugacity and pressure are numerically equal, when the gas is

  4. A.
    in standard state
    B.
    at high pressure
    C.
    at low temperature
    D.
    in ideal state

  5. Refrigerants commonly used for domestic refrigerators are

  6. A.
    ethyl chloride or methyle chloride
    B.
    freon-12
    C.
    propane
    D.
    NH3 or CO2.

  7. Solid and liquid phases of a substance are in equilibrium at the

  8. A.
    critical temperature
    B.
    melting point.
    C.
    freezing point.
    D.
    both (b) and (c).

  9. Absolute zero temperature signifies the

  10. A.
    minimum temperature attainable.
    B.
    temperature of the heat reservoir to which a Carnot engine rejects all the heat that is taken in.
    C.
    temperature of the heat reservoir to which a Carnot engine rejects no heat.
    D.
    none of these.

  11. Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.).

  12. A.
    entropy
    B.
    internal energy
    C.
    enthalpy
    D.
    Gibbs free energy

  13. The equation relating E, P, V and T which is true for all substanes under all conditions is given by .This equation is called the

  14. A.
    Maxwell's equation.
    B.
    thermodynamic equation of state.
    C.
    equation of state.
    D.
    Redlich-Kwong equation of state.

  15. For an exothremic reaction

  16. A.
    only enthalpy change (ΔH) is negative.
    B.
    only internal energy change (ΔE) is negative.
    C.
    both ΔH and ΔE are negative.
    D.
    enthalpy change is zero.

  17. Pick out the wrong statement.

  18. A.
    An ideal liquid or solid solution is defined as one in which each component obeys Raoult's law.
    B.
    If Raoult's law is applied to one component of a binary mixture ; Henry's law or Raoult's law is applied to the other component also.
    C.
    Henry's law is rigorously correct in the limit of infinite dilution.
    D.
    none of these.

  19. The shape of T-S diagram for Carnot Cycle is a

  20. A.
    rectangle
    B.
    rhombus
    C.
    trapezoid
    D.
    circle