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C 1264

What are the parts of a heat engine ? :

1 ‏ا‎ 6 : es.
Explain the difference between distinguishable and indistinguishable particles

5 ५ : symbols,
Give the expression for the efficiency of a diesel engine and explain the sym
What is T-S diagram ? Give its use.
What is the difference between a canonical ensemble and a microcanonical ensemble.
(6 x 2 = 12 marks)
Section C (Answer in a paragraph of about half a page to one page)

Answer at least four questions.

Each question carries 5 marks.

All questions can be attended.
Overall Ceiling 20.

Give two versions of the second law of thermodynamics.
State and prove the principle of increase of entropy.

Using Maxwell's thermodynamic relations, prove that the ratio of the adiabatic to the isobaric
co-efficient of expansion is U(1 — y).

Explain the term Helmholtz free energy. Show that in a natural isothermal change at constant
volume, Helmholtz free energy decreases.

Draw the Maxwell-Boltzmann velocity distribution curve and state the features of the distribution
curve.

Distinguish between Classical and Quantum Statistics,

From the first law of thermodynamies prove that C,-C,=R.

(4 x 5 = 20 marks)
Section D (Problems. write all relevant formulas)

Answer at least three questions.
Each question carries 6 marks,
All questions can be attended.

Overall Ceiling 18,

Find the most probable, avera

ge and root mean square speeds of n
the molecular mass of N, mol

ecule = 2.8 x 10-3 ke/mol, the gas

A quantity of air at 27°C: is suddenly compresse i igi
١ pressed to half its ori 81781101 i fi
ना cea 11.49 at volume. Find the final pressure

itrogen molecule at 27°C. Given
constant R = 8.31 J/mol K.