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Chemical Engineering :: Chemical Engineering Thermodynamics

  1. A gas shows deviation from ideal behaviour at

  2. A.

     Low pressure and high temperature

    B.

     Low pressure and low temperature

    C.

     Low temperature and high pressure

    D.

     High temperature and high pressure


  3. Fugacity and pressure are numerically not equal for the gases

  4. A.

     At low temperature and high pressure

    B.

     At standard state

    C.

     Both A and B

    D.

     In ideal state


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

  6. A.

     Lewis-Randall

    B.

     Margules

    C.

     Van Laar

    D.

     Both B & C


  7. Pick out the correct statement.

  8. A.

     If an insoluble gas is passed through a volatile liquid placed in a perfectly insulated container, the temperature of the liquid will increase

    B.

     A process is irreversible as long as Δ S for the system is greater than zero

    C.

     The mechanical work done by a system is always equal to ∫P.dV

    D.

     The heat of formation of a compound is defined as the heat of reaction leading to the formation of the compound from its reactants


  9. Entropy change of mixing two liquid substances depends upon the

  10. A.

     Molar concentration

    B.

     Quantity (i.e. number of moles)

    C.

     Both A and B

    D.

     Neither A nor B


  11. Pick out the wrong statement.

  12. A.

     Surface tension of a substance vanishes at critical point, as there is no distinction between liquid and vapour phases at its critical point

    B.

     Entropy of a system decreases with the evolution of heat

    C.

     Change of internal energy is negative for exothermic reactions

    D.

     The accentric factor for all materials is always more than one


  13. Ideal gas law is applicable at

  14. A.

     Low T, low P

    B.

     High T, high P

    C.

     Low T, high P

    D.

     High T, low P


  15. Ideal refrigeration cycle is

  16. A.

     Same as Carnot cycle

    B.

     Same as reverse Carnot cycle

    C.

     Dependent on the refrigerant's properties

    D.

     The least efficient of all refrigeration processes


  17. Specific volume of an ideal gas is

  18. A.

     Equal to its density

    B.

     The reciprocal of its density

    C.

     Proportional to pressure

    D.

     None of these


  19. The necessary and sufficient condition for equilibrium between two phases is

  20. A.

     The concentration of each component should be same in the two phases

    B.

     The temperature of each phase should be same

    C.

     The pressure should be same in the two phases

    D.

     The chemical potential of each component should be same in the two phases