M12302 Strength Of Materials DME Question Paper Model : psgpolytech.ac.in

College : Psg Polytechnic College
Degree : DME (Diploma in Mechanical Engineering)
Semester : III
Subject : M12302 Strength Of Materials
Document Type : Model Question Paper
Website : psgpolytech.ac.in

Download Model/ Sample Question Papers :https://www.pdfquestion.in/uploads/psgpolytech.ac.in/6188-M12302%20%20%20%20%20STRENGTH%20OF%20MATERIALS.pdf

PSG Polytech Strength Of Materials Question Paper

Instructions :
1. Group A and Group B questions should be answered in the Main Answer book.
2. Answer any TEN questions in Group A. Each question carries three marks.

Related / Similar Question Paper :
PSG Polytechnic DME Automobile Engineering Question Paper

3. Answer ALL questions either (a) subdivision or (b) subdivision in Group B. Each question carries 14 marks.

PSG POLYTECHNIC COLLEGE, COIMBATORE – 641 004
M12302 Strength Of Materials Model Question Paper
Time : 3 Hours
Max.Marks: 100
Marks : 10 x 3 = 30

Group – A

1. State the Parallelogram Law for the addition of forces.
2. Define stress and strain with the units.
3. Write about resilience and proof resilience.
4. What is meant by thermal stresses-
5. Discuss Poisson’s ratio.

6. Describe about composite bar.
7. Define thin cylinders. What are the stresses set up in a thin cylinder subjected to internal fluid pressure?
8. List the different types of failures of a riveted joint.
9. Discuss the disadvantages of welded joint over riveted joint.

10. What are all the different types of beams?
11. What is meant by point of contra-flexure?
12. What are the assumptions made in the theory of simple bending?

13. State torsional rigidity.
14. What is meant by “strength of a shaft”?
15. What is a spring? Name the two important types.

Group – B

Marks : 5 x 14 = 70
16. a) (i) Two forces of magnitude 15 N and 12 N are acting at a point. The angle between the forces is 60o. Find the resultant in magnitude. (7)

(ii) Three forces of magnitude 40 kN, 15 kN and 20 kN are acting at a point O. The angle made by 40 kN, 15 kN and 20 kN forces with x-axis are 60o, 120o and 240o respectively. Determine the magnitude and direction of the resultant force. (7)
(OR)
b) (i) A tensile load of 40 kN is applied axially on a bar of diameter 5 cm. What is the tensile stress in the section? (7)

(ii) A Steel rod of diameter 500mm and length 2.5m is subjected to gradually applied load of 20 kN. Calculate the strain energy in the rod. Take E = 2×105 N/mm2 (7)

17. a) A compound tube consists of a steel tube 170mm external diameter and 10mm thickness and an outer brass tube 190 mm external diameter and 10mm thickness. The two tubes are of same length. The compound tube carries an axial load of 1MN.

Find the stress and the load carried by each tube and the amount by which it shortens. Length of each tube is 0.15 m.Take Es = 200 GN/m2 and Eb=100 GN/m2
(OR)

b) A steel rod of 20mm diameter passes centrally through a copper tube of 50mm external diameter and 40 mm internal diameter. The tube is closed at each end by rigid plates of negligible thickness. The nuts are tightened lightly home on the projecting parts of the rod.

If the temperature of the assembly is raised by 50, Calculate the stresses developed in copper and steel. Take Es=200 kN/mm2 and Ec=100 kN/mm2 and s= 12×10-6 /C and c=18×10-6/C

18. a) A boiler shell is to be made of 20mm thick plate having a limiting tensile stress of 125 N/mm2. If the efficiencies of the longitudinal and circumferential joints are 80% and 30% respectively,

Determine (i) the maximum permissible diameter of the shell for an internal pressure of 2.5 N/mm2 and (ii) Permissible intensity of internal pressure when the shell diameter is 1.6m.
(OR)
b) (i) Two plates 8m thick are joined by a single riveted lap joint. The diameter of the rivets is 16mm and pitch = 50mm. If σt = 120 N/mm2, σs = 90 N/mm2, σb = 160 N/mm2, determine the efficiency of the riveted joint. (7)

(ii) A double riveted double cover butt joint is used to connect two plates 15mm thick. The rivets are 26mm in diameter and are provided at a pitch of 100mm. The allowable stresses in tension, shear and bearing are 130 N/mm2, 75 N/mm2 and 150 N/mm2 respectively. Find the efficiency of the riveted joint. (7)