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water. The mean temperature of the cooling water circulating through the
condenser of the refrigerating machine is 18°C. Evaluate the minimum
electrical work in kWh required to produce | tonne of ice (The enthalpy of
fusion of ice at atmospheric pressure is 333.5 kJ/kg).

Derive the expression for maximum work obtainable when heat transfer occurs
between a finite body and a thermal energy reservoir.

What do you mean by “dead state” of a system?

Obtain an expression for useful work for a steady flow system which interacts
only with the surroundings.
Explain the following i)P-V-T surface 11) Mollier Charts

A rigid closed tank of volume 3 ന contains 5 kg of wet steam at a pressure of
200 kPa. The tank is heated until the steam becomes dry saturated. Determine
the final pressure and the heat transfer to the tank.
PART C

Answer any four full questions, each carries 10 marks.
Explain the following i) Law of corresponding states ii)Compressibility factor
iii)Virial expansion _iv)Van der Waals equation of state
Explain Amagat’s law of additive volumes for a mixture of ideal gases.

A certain mass of sulphur dioxide is contained in a vessel of 0.142 ന്‌ capacity
at a pressure and temperature of 23.1 bar and 18°C respectively. A valve is
opened momentarily and the pressure falls immediately to 6.9 bar. Sometimes
later the temperature is again 18°C and the pressure is observed to be 9.1 bar.
Estimate the value of specific heat ratio.

Obtain Maxwell’s equations from basic thermodynamic relations.

Derive Clausius —Clapeyron equation.

Explain the following terms i) Enthalpy of formation ii) Heating Values
Explain the Joule Kelvin effect and the inversion curve.

Explain the enthalpy of formation in the chemical combustion process.

What do you mean by equivalence ratio for combustion? Write down the
balanced combustion equation of വ, and with 50% excess air.

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