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Home ‣ Mechanical Engineering ‣ Thermodynamics Comments
  • Question

  • In a free expansion process,


  • Options
  • A. W1 - 2 = 0
  • B. Q1 - 2 = 0
  • C. dU = 0
  • D. all of these

  • Correct Answer
  • all of these 

    • Thermodynamics problems

    Search Results

    • 1. By decreasing the highest temperature in the Carnot cycle, its efficiency is increased.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. One kg of carbon requires 8/3 kg of oxygen for its complete combustion and produces 11/3 kg of carbon dioxide gas.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 3. The increase in entropy of a system represents

    • Options
    • A. increase in availability of energy
    • B. increase in temperature
    • C. decrease in pressure
    • D. degradation of energy
      • Discuss
    • 4. A perpetual motion machine of the first kind is __________ according to first law of thermodynamics.

    • Options
    • A. possible
    • B. impossible
      • Discuss
    • 5. The gas in cooling chamber of a closed cycle gas turbine is cooled at

    • Options
    • A. constant volume
    • B. constant temperature
    • C. constant pressure
    • D. none of these
      • Discuss
    • 6. In closed cycle gas turbine, the air is compressed

    • Options
    • A. isothermally
    • B. isentropically
    • C. polytropically
    • D. none of these
      • Discuss
    • 7. The efficiency of a gas turbine is given by

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 8. Boyle's law states that change of internal energy of a perfect gas is directly proportional to the change of temperature.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 9. A process, in which the gas is heated or expanded in such a way that product of its pressure and volume remains constant, is called isothermal process.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 10. The temperature at which the volume of a gas becomes zero is called

    • Options
    • A. absolute scale of temperature
    • B. absolute zero temperature
    • C. absolute temperature
    • D. none of these
      • Discuss

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