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Home Chemical Engineering Chemical Engineering Thermodynamics Comments

  • Question
  • 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

  • Correct Answer
  • zero 


  • Chemical Engineering Thermodynamics problems


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    • 1. 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
    • 2. Out of the following refrigration cycles, which one has the minimum COP (Co-efficient of performance)?

    • Options
    • A. Air cycle
    • B. Carnot cycle
    • C. Ordinary vapour compression cycle
    • D. Vapour compression with a reversible expansion engine
    • Discuss
    • 3. Entropy of an ideal gas depends upon its

    • Options
    • A. pressure
    • B. temperature
    • C. both (a) & (b)
    • D. neither (a) nor (b)
    • Discuss
    • 4. In any spontaneous process,

    • Options
    • A. only F decreases
    • B. only A decreases
    • C. both F and A decreases
    • D. both F and A increase
    • Discuss
    • 5. Pick out the correct statement.

    • Options
    • A. Compression ratio of an Otto engine is comparatively higher than a diesel engine.
    • B. Efficiency of an Otto engine is higher than that of a diesel engine for the same compression ratio.
    • C. Otto engine efficiency decreases with the rise in compression ratio, due to decrease in work produced per quantity of heat.
    • D. Diesel engine normally operates at lower compression ratio than an Otto engine for an equal output of work.
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. In jet refrigerators, the refrigerating fluid is practically always

    • Options
    • A. water
    • B. ammonia
    • C. freon
    • D. brine
    • Discuss


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