Problem 4:

Answer following questions.

1. What are the limitations of the first law of

thermodynamics?

2. State the importance of the second law of thermo-

dynamics.

3. Define thermal reservoir, heat engine, refrigerator

and heat pump.

4. What is a thermal energy reservoir? Define in

terms of heat source and heat sink.

5. What are the characteristic features of a heat

engine?

6. What is a heat pump. How does it differ from a

refrigerator?

7. What do you mean by coefficient of performance?

Show that (COP)HP = (COP) R+ 1.

8. What do mean by thermal efficiency? Derive an

expression for thermal efficiency of a heat engine.

9. State the Kelvin-Planck and Clausius statements

of the second law of thermodynamics.

10. Prove that the Kelvin Plank and Clausius's

statements of the second law of thermodynamics

are equivalent to each other.

11. Is it possible for a heat engine to operate without

rejecting any amount of heat. Explain with proper

sketch.

12. Prove that violation of Kelvin-Planck statement

leads to violation of Clausius statement.

13. Prove that violation of the Clausius statement

leads to violation of the Kelvin-Planck statement.

14. Explain reversibility and irreversibility. State the

factors responsible for irreversibility of a process.