ME010506 Thermodynamics B.Tech Model Question Paper : mgu.ac.in

Name of the University : Mahatma Gandhi University
Department : Mechanical Engineering
Degree : B.Tech
Subject Code/Name : ME 010 506/Thermodynamics
Sem : V
Website : mgu.ac.in
Document Type : Model Question Paper

Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/mgu.ac.in/5352-ME506.doc

MGU Thermodynamics Model Question Paper

B.TECH Degree Examination :
Fifth Semester :
Branches: Mechanical Engineering/Automobile Engineering/Production Engineering
ME 010 506 Thermodynamics : (M, U)
Time: Three Hours
Maximum: 100 Marks

Related : Mahatma Gandhi University Internal Combustion Engines & Combustion B.Tech Model Question Paper : www.pdfquestion.in/5350.html

Use of Steam tables and Psychometric chart are permitted :

Part A

Answer all questions.:
1. Explain the control volume and control mass concept.
2. Write down the steady flow energy equation applied to Compressor and Turbine.
3. What is the principle of increase of entropy?
4. What are the Maxwell relations and what is their necessity?
5. State Dalton’s law of partial pressures.
[5 x 3 = 15 marks]

Part B

Answer all questions. :
6. Write short note on Compressibility factor and the Law of corresponding states.
7. Explain the temperature scales used in SI and English system.
8. State Clausius Statement of Second Law and explain Third law of thermodynamics.
9. Show that internal energy of an ideal gas is a function of temperature only.
10. With a neat sketch explain the Mollier diagram.
[5 x 5 = 25 marks]

Part C

Answer any one full question from each module. :
11. (a) What do you mean by thermodynamic equilibrium?
(b) 3 m3 of air has a pressure of 5 bar and a temperature of 127oC. After it has received 650 KJ of heat, at constant volume, find the final temperature and pressure. Also calculate change in entropy. (6 + 6 = 12 marks)
Or
12. (a) Explain the concept of continuum.
(b) Determine the specific volume of refrigerant-134a at 1 MPa and 50oC, using (i) the ideal-gas equation of state. (ii) the generalized compressibility chart. Compare the values obtained to the actual value of 0.021796 m3/kg and determine the error involved in each case.
(Take R = 0.0815 kPa.m3/kg.K, Pcr = 4.059 MPa, Tcr = 374.2 K). (6 + 6 = 12 marks)
13. (a) Write a note on Joule Thompson effect.
(c) A gas in a piston-cylinder assembly undergoes an expansion process for which the relationship between pressure and volume is given by pVn = constant . The initial pressure is 0.3 MPa, the initial volume is 0.1 m3 and the final volume is 0.2 m3. Determine the work for the process in kJ if (i) n = 1.5, (ii) n = 1.0, (iii) n = 0. (6 + 6 = 12 marks)
Or
14. (a) What are the modes in which energy is stored in a system?
(c) Write the steady flow energy equation for a single stream entering and a single stream leaving a control volume and explain the various terms in it. (6 + 6 = 12 marks)
15. (a) State and derive the Clausius inequality principle.
(b) Prove that entropy is a property of the system. (6 + 6 = 12 marks)
Or
16. (a) With a neat sketch explain Carnot cycle.
(b) A Carnot engine absorbs 200 J of heat from a reservoir at the temperature of normal boiling point of water and rejects heat to a reservoir at the temperature of the triple point of water. Find the heat rejected, the work done by the engine and the thermal efficiency. (6 + 6 = 12 marks)
17. Explain Clapeyron equation and obtain the Clausius-Clapeyron equation from it. (12 marks)
Or
18. Write notes on Gibbs and Helmholtz function and derive the two Tds equations. (12 marks)
19. What is a pure substance? Explain with the help of P-V, P-T and T-S diagrams. (12 marks)
Or
20. A vessel of volume 0.04 m3 contains a mixture of saturated water and saturated steam at a temperature of 250oC. The mass of the liquid present is 9 kg. Find the,
i. pressure
ii. mass
iii. specific volume
iv. enthalpy
v. entropy
vi. internal energy (12 marks)
[5 x 12 = 60 marks]

Advanced Mechanics of Materials

Time: Three hours
Maximum: 100 Marks
Part A :
Answer all the questions.
Each question carries three marks.
1. Define the term state of strain at a point.
2. Explain the terms plain stress and plane strain.
3. What are the stresses in thick cylinder under axisymmetric load? Discuss.
4. State Maxwell reciprocal theorem.
5. What is the significance of membrane analogy (5X3=15 marks)

Part B :
Answer all the questions.
Each question carries three marks.
1. What is a stress function? How do you relate the polar components of stress with stress function?
2. Explain the effect of small central hole in a rotating cylinder.
3. Explain the method of determination of constants in Lamis equation for thick cylinders
5. Derive the expression for torsion in a prismatic bar of elliptical cross section (5X5=25 marks)

Part C :
Answer all the questions
1. The state of stress at a point is characterized by the following rectangular stress components sx = 20, sy=10, sz= 5 t xy=-10, t yz=-15, t zx=-20 Find the values of principal stress and their directions.
Or
2. Derive the compatibility equations what are its significance.
3. Derive the expression for radial stress distribution over the thickness of a spherical shell
Or
4. An alloy steel cylinder has a 120mm internal diameter and 444mm outside diameter. If it is subjected to an internal pressure of 125MPa,(outside pressure =0)
a. Determine the radial and tangential stress distribution and plot them
b. Determine the maximum principal shear stress.
5. Determine the ratio of numerical values of smax and smin for a curved bar of circular cross section if radius of curvature of centroidal axis is 5cm and h = r2-r1 = 40 cm.
Or
6. Derive the expression for the pure bending of a bar with rectangular cross section.
7. The stress field for a beam of length 2l and depth 2c under the bending moment M is given by sx= -3M/2c3 y, sy = sz = t xy= t yz= t zx= 0. Find the total strain energy density in the beam.
Or
8. Find an expression in terms of sy , sz , t xy for the strain energy V per unit thickness of a cylinder in plane strain.
9. Determine the shear stress induced and the angle of twist per unit length of a hollow shaft of dimension 80mmX40mm and wall thickness 5mm when subjected to a torque of 1 kN m. G= 1.3x104MPa