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Home ‣ Chemical Engineering ‣ Chemical Engineering Thermodynamics Comments
  • Question

  • 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

  • Correct Answer
  • none of these 

    • Chemical Engineering Thermodynamics problems

    Search Results

    • 1. The expression, , 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
    • 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. 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
    • 4. Internal energy change of a system over one complete cycle in a cyclic process is

    • Options
    • A. zero
    • B. +ve
    • C. -ve
    • D. dependent on the path
      • Discuss
    • 5. Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27°C, the temperature should be raised to __________ °C.

    • Options
    • A. 270
    • B. 327
    • C. 300
    • D. 540
      • Discuss
    • 6. In jet refrigerators, the refrigerating fluid is practically always

    • Options
    • A. water
    • B. ammonia
    • C. freon
    • D. brine
      • Discuss
    • 7. 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
    • 8. 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
    • 9. Which of the following is not an intensive property?

    • Options
    • A. Chemical potential
    • B. Surface tension
    • C. Heat capacity
    • D. None of these
      • Discuss
    • 10. "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

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