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ME-302 · Thermodynamics/Unsolved PYQ Paper

ME-302 Thermodynamics - Dec 2025 Question Paper

  1. 7 Marks
    aWhat is a thermodynamic system? Explain different classes of systems with suitable examples.
  2. 7 Marks
    bSteam at a 6.87 bar, $205^{\circ}C$, enters in an insulated nozzle with a velocity of 50 m/s. It leaves at a pressure of 1.37 bar and a velocity of 500 m/s. Determine the final enthalpy of steam.
  3. 7 Marks
    aGive available energy and unavailable energy with reference to the thermodynamic cycle.
  4. 7 Marks
    bExplain the Carnot cycle with a neat diagram and derive its efficiency.
  5. 7 Marks
    aDefine phase and phase transformation. Explain the different phase transformations of a pure substance.
  6. 7 Marks
    bDefine dryness fraction. Describe the methods of measuring the dryness fraction of steam.
  7. 7 Marks
    aAir enters the compressor of a gas turbine plant operating on Brayton cycle at 101.325 kPa, $27^{\circ}C$. The pressure ratio in the cycle is 6. Calculate the maximum temperature in the cycle and the cycle efficiency. Assume $W_T = 2.5\ W_C$, where $W_T$ and $W_C$ are the turbine and the compressor work respectively. Take $\gamma = 1.4$.
  8. 7 Marks
    bExplain the composition of gas mixtures in terms of mole fraction and mass fraction.
  9. 7 Marks
    aDefine adiabatic flame temperature and explain its physical significance.
  10. 7 Marks
    bDiscuss the role of enthalpy of reaction and adiabatic flame temperature in thermal system design.
  11. 7 Marks
    aExplain actual combustion. Discuss the causes and effects of incomplete combustion.
  12. 7 Marks
    bExplain zeroth law of thermodynamics. Also mention the limitation of first law of thermodynamics.
  13. 7 Marks
    aDescribe the Otto cycle with neat diagrams. Derive the expression for its air-standard efficiency.
  14. 7 Marks
    bExplain the steam formation with relevant sketch and label all salient points and explain every point in detail.
  15. 7 Marks
    aExplain the Kelvin-Planck statement and the Clausius statement of the second law of thermodynamics. Also mention its application.
  16. 7 Marks
    bDefine and explain thermodynamic properties. Distinguish between intensive and extensive properties with examples.
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