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Chemical Engineering :: Chemical Engineering Thermodynamics

  1. Specific __________ does not change during phase change at constant temperature and pressure.

  2. A.

     Entropy

    B.

     Gibbs energy

    C.

     Internal energy

    D.

     Enthalpy


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

  4. A.

     Increase

    B.

     Decrease

    C.

     Remain unchanged

    D.

     First fall and then rise


  5. Which of the following is an extensive property of a system?

  6. A.

     Heat capacity

    B.

     Molal heat capacity

    C.

     Pressure

    D.

     Concentration


  7. The expression for entropy change, ΔS = n Cp . ln (T₂/T₁), is valid for the __________ of a substance.

  8. A.

     Simultaneous pressure & temperature change

    B.

     Heating

    C.

     Cooling

    D.

     Both B and C


  9. When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change. This is called the

  10. A.

     Le-Chatelier principle

    B.

     Kopp's rule

    C.

     Law of corresponding state

    D.

     Arrehenius hypothesis


  11. Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of mixture __________ calorimeter is not used for measuring the dryness fraction of steam.

  12. A.

     Bomb

    B.

     Separating

    C.

     Bucket

    D.

     Throttling


  13. Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg . K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is

  14. A.

     Superheated vapour

    B.

     Partially condensed vapour with quality of 0.9

    C.

     Saturated vapour

    D.

     Partially condensed vapour with quality of 0.1


  15. The extensive properties are

  16. A.

     Volume, mass and number of moles

    B.

     Free energy, entropy and enthalpy

    C.

     Both A and B

    D.

     None of these


  17. The intensive properties are

  18. A.

     Molar volume, density, viscosity and boiling point

    B.

     Refractive index and surface tension

    C.

     Both A and B

    D.

     None of these


  19. Which of the following has the least thermal efficiency?

  20. A.

     Steam engine

    B.

     Carnot engine

    C.

     Diesel engine

    D.

     Otto engine