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B4B024 Pages: 2

a) Write down the corollaries of second law of thermodynamics. (3)

b) What is Clausius inequality? Demonstrate the validity of Clausius inequality. (7)

Derive Clausius Clapeyron equation for a phase change process. (10)
Derive Tds equations using Maxwell’s relation. (10)
PART C

Answer any four questions.

Explain about PVT surface for a pure substance. (10)
0.5 kg of air is compressed reversibly and adiabatically from 80 kPa, 60°C to 0.4 MPa
and is then expanded at constant pressure to the original volume. Sketch these

processes on the P-V and T-S planes. Compute the heat transfer and work transfer for

the whole path. (10)
Explain

a) Triple point. (2)
b) With neat sketches explain the phase change process for a pure substance. (8)

The pressure and temperature at the beginning of compression in an air standard
Brayton cycle are 100 kPa and 27°C.The heat added per kg of air 1850 kJ. The
compression ratio is 4.Determine the maximum pressure and temperature, thermal
efficiency and mean effective pressure. Assume y=1.4, Cp=1.005 kJ/kgK. (10)
With PV and TS diagram explain about Stirling cycle and derive the equation for
thermal efficiency.(10)
In an ideal Atkinson cycle, the gas is compressed is entropically from 1 bar, 27 °C to
4 bar. The maximum pressure of the cycle is limited to 16 bar. Calculate:

a) Work done per kg of cycle,

b) Thermal efficiency of the cycle,

c) Mean effective pressure of the cycle.

Take (= 0.761 kJ/kgK and Cv=0.573 kJ/kgK (10)

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