D 02000ME205092001 Pages: 2

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Third Semester B.Tech Degree (S,FE) Examination December 2020 (2015 Scheme)

Course Code: ME205
Course Name: THERMODYNAMICS
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any three full questions, each carries 10 marks. Marks
1 a) Discuss the following
i) Macroscopic and Microscopic approaches in thermodynamics with suitable (6)
example.
ii) Thermodynamic Equilibrium
b) Explain the Zeroth law of thermodynamics and its significance. (4)

2 9) Explain temperature scale. How can the ideal gas temperature for the steam (4)
point be measured?
b) Show that work is a path function and not a property. Why does free expansion (6)
have zero work transfer?
3 ച Define enthalpy. Why the enthalpy of an ideal gas does depend only on (5)
temperature?
b) A gas expands from initial state where the pressure is 340 kPa and the volumeis (5)
0.0425 മ്‌ to a final pressure of 136 kPa. The relationship between the pressure
and volume of the gas is pv’ = c constant. Determine the work for the process.
4 ஐ Derive the steady flow energy equation. (5)

b) Air enters a compressor operating at steady state at a pressure of 1 bar, a (5)
temperature of 290 K, and a velocity of 6 m/s through an inlet with an area of
0.1 ஈ At exit, the pressure is 7 bar, the temperature is 450 K and the velocity
is 2 m/s. heat transfer from the compressor to the surroundings occurs at the rate
of 180kJ/min. Employing the Ideal gas model, calculate the power input to the
compressor. Take cp = 1.005 kJ/kgK.
PART ‏تا‎
‎Answer any three full questions, each carries 10 marks.

5 9) State the Kelvin-Plank statement of the second Law. To produce network ina (5)
thermodynamic cycle, a heat engine has to exchange heat with two thermal
reservoirs. Explain.

b) Establish the equivalence of Kelvin-Planck and Clausius Statements. (5)

6 a) A refrigeration plant for a food store operates as a reversed Carnot heat engine (6)
cycle. The store is to be maintained at a temperature of — 5°C and the heat
transfer from the store to the cycle is at the rate of 5 kW. If heat is transferred

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