Solved Important 16 marks Long Questions

SOLVED QUESTIONS

1. Define the following terms:

(1) Thermodynamics

Refer chapter 1.1 on Page 1.1.

(2) Macroscopic approach

Refer chapter 1.2.2 on Page 1.3.

(3) Continuum.

Refer chapter 1.7 on Page 1.12.

2. Define heat and show that heat is a path function and not a property.

Refer chapter 1.16 on Page 1.24.

3. Derive the expression for the displacement work.

Refer chapter 1.19.2 on Page 1.30.

4. State first law of thermodynamics and list its limitations. 

Refer chapters 1.24 & 1.25 on Pages 1.42 & 1.43 respectively.

5. Considering a system which changes its state, prove that the internal energy is a point function. 

Refer chapter 1.25 on Page 1.43.

6. Derive the relationship between p, V and T for the following processes.

(i) isobaric (ii) isochoric (iii) isothermal (iv) isentropic and (v) polytropic.

Refer chapter 1.28 on Page 1.68.

7. Define enthalpy. How is it related to internal energy?

Refer Page 1.70.

8. Derive an expression for the work transfer in an isothermal process. 

Refer chapter 1.28.3 on Page 1.74.

9. Derive the equation for the value of polytropic index and adiabatic index.

Refer chapter 1.28.5 on Page 1.76 for adiabatic index and chapter 1.28.6 on Page 1.79 for polytropic index.

10. Establish the relationship between the specific heat at constant pressure and specific heat at constant volume. 

Refer chapter 1.29 on Page 1.84.

11. Write down the steady flow energy equation and explain the significance of each term involved in it.

Refer chapter 1.34 on Page 1.131.

12. Apply steady flow energy equation for a nozzle. State the assumptions made.

Refer chapter 1.35 on Page 1.133.

13. Write the steady flow energy equation and simplify it to be applicable for a gas turbine and a compressor.

Refer chapter 1.34 on Page 1.131 for SFEE and chapter 1.35.4 & 1.35.5 on Pages 1.135 and 1.136 respectively.

14. Discuss the following steady-flow engineering devices with SFEE equations.

(i) Nozzles and diffusers

(ii) Compressors and turbines.

Refer chapter 1.35 on Page 1.133.

15. Derive steady flow energy equation per unit mass and show that shaft work produced by a gas turbine is equal to the enthalpy drop across the gas turbine.

Refer chapters 1.36 on Pages 1.138.

16. Derive the unsteady flow energy equation for filling and emptying the vessel.

Refer chapter 1.40 on Page 1.172.