Solved Important 16 marks Long Questions

SOLVED QUESTIONS

1. Deduce the expression for the entropy change in terms of pressure and temperature.

Refer chapter 3.1.1 on Page 3.2.

2. Derive the expression for the change in entropy for the following process: (i) Isochoric (ii) Isobaric (iii) Isothermal (iv) Isentropic and (v) Polytropic.

Refer chapter 3.2 on Page 3.4.

3. Prove that increase in entropy in a polytropic process is pppp

Refer Page 3.7.

4. A refrigerator operating between two identical bodies cools one of the bodies to a temperature T2. Initially both the bodies are at temperature T1. Deduce the expression for the minimum specific work input, taking their specific heat as c. 

Refer chapter 3.4.3 on Page 3.13.

5. Show that there is a decrease in available energy when heat is transferred through a finite temperature difference.

Refer chapter 3.11 on Page 3.51.

6. Explain the effectiveness of a system.

Refer chapters 3.15 on Page 3.56.

 [Hint:- Second law efficiency of the system is called effectiveness of the system]

7. Explain irreversibility with respect to flow and non-flow processes. Refer chapters 3.17 and 3.18 on Pages 3.59 and 3.61 respectively.