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Chemical Engineering Thermodynamics problems


  • 1. High __________ is an undesirable property for a good refrigerant.

  • Options
  • A. specific heat
  • B. latent heat of vaporisation
  • C. viscosity
  • D. specific vapor volume
  • Discuss
  • 2. All gases during throttling process at atmospheric temperature and pressure show a cooling effect except

  • Options
  • A. CO2
  • B. H2
  • C. O2
  • D. N2
  • Discuss
  • 3. The expression, Chemical Engineering Chemical Engineering Thermodynamics: The expression, , give , gives the free energy change

  • Options
  • A. with pressure changes at constant temperature.
  • B. under reversible isothermal volume change.
  • C. during heating of an ideal gas.
  • D. during cooling of an ideal gas.
  • Discuss
  • 4. The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of __________ and COP are the same.

  • Options
  • A. kinematic viscosity
  • B. work
  • C. temperature
  • D. none of these
  • Discuss
  • 5. In jet refrigerators, the refrigerating fluid is practically always

  • Options
  • A. water
  • B. ammonia
  • C. freon
  • D. brine
  • Discuss
  • 6. For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system __________ as its mole fraction increases.

  • Options
  • A. decreases
  • B. increases
  • C. remains same
  • D. decreases linearly
  • Discuss
  • 7. Van Laar equation deals with the activity co-efficients in

  • Options
  • A. binary solutions
  • B. ternary solutions
  • C. azeotropic mixture only
  • D. none of these
  • Discuss
  • 8. Which of the following is not an intensive property?

  • Options
  • A. Chemical potential
  • B. Surface tension
  • C. Heat capacity
  • D. None of these
  • Discuss
  • 9. "At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero". This follows from the

  • Options
  • A. third law of thermodynamics
  • B. second law of thermodynamics
  • C. Nernst heat theorem
  • D. Maxwell's relations
  • Discuss
  • 10. Boyle's law for gases states that

  • Options
  • A. , when temperature is constant.
  • B. , when temperature & mass of the gas remain constant.
  • C. P ? V, at constant temperature & mass of the gas.
  • D. = constant, for any gas.
  • Discuss

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