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  • Question
  • 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.

  • Correct Answer
  • Efficiency of an Otto engine is higher than that of a diesel engine for the same compression ratio. 


  • Chemical Engineering Thermodynamics problems


    Search Results


    • 1. "Law of corresponding states" says that

    • Options
    • A. , two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same.
    • B. the surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at the critical temperature.
    • C. no gas can be liquified above the critical temperature, howsoever high the pressure may be.
    • D. the molar heat of energy of gas at constant volume should be nearly constant (about 3 calories).
    • Discuss
    • 2. A refrigerator may be termed as a

    • Options
    • A. heat pump
    • B. heat engine
    • C. Carnot engine
    • D. none of these
    • Discuss
    • 3. Joule-Thomson experiment is

    • Options
    • A. isobaric
    • B. adiabatic
    • C. isenthalpic
    • D. both(b) & (c)
    • Discuss
    • 4. Degress of freedom at triple point will be

    • Options
    • A. 0
    • B. 1
    • C. 2
    • D. 3
    • Discuss
    • 5. A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is

    • Options
    • A. zero
    • B. positive
    • C. negative
    • D. none of these
    • Discuss
    • 6. 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
    • 7. Entropy of an ideal gas depends upon its

    • Options
    • A. pressure
    • B. temperature
    • C. both (a) & (b)
    • D. neither (a) nor (b)
    • Discuss
    • 8. 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
    • 9. 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
    • 10. 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


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