Download PTU B.Tech 2020 March ME 4th Sem Strength Of Materials II Question Paper

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Total No. of Pages : 02
Total No. of Questions : 09

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B.Tech.(Marine Engg.) (2013 Onwards) (Sem.-4)
STRENGTH OF MATERIALS-II
Subject Code : BTME-401
M.Code : 72434
Time : 3 Hrs. Max. Marks : 60

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INSTRUCTION TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

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1. Answer briefly :
   1. What is energy of distortion?
   2. State Castigiliano’s theorem.
   3. What is a theory of failure?
   4. What is a hoop stress?
   5. State assumptions made in Lame's theory.

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   6. What is a helical spring?
   7. Define proof resilience.
   8. Give any two examples of rotating thin ring.
   9. Where does the maximum vertical shear stress occur in I-section?
   10. What is a shear centre?

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SECTION-B

2. A mild steel shaft is subjected to a torque of 3 kNm and a bending moment of 2 kNm. Calculate the diameter of the shaft required if the yield stress of the material is 200 MPa and factor of safety is 2. Use principal stress theory.
3. A thick cylinder of 150 mm internal diameter is subjected to an internal pressure of 6 MPa. Determine the thickness of the cylinder if the material is not to be stressed beyond 12 MPa.
4. Derive an expression for the hoop and longitudinal stresses in a thin cylinder subjected to internal pressure. State the assumptions made.

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5. What is the type of variation of bending stress across the section of a curved bar with large initial curvature? Discuss.
6. Write short notes on stresses in rotating disc.

SECTION-C

6. Determine the mean coil radius, wire diameter and number of turns of a close coiled spring of 1 kN/m stiffness and solid length 45 mm. The shear stress in the spring under an axial load of 75 N should not exceed 180 MPa. Modulus of rigidity for the spring material = 82 GPa.
7. A beam of T-section with flange 300 mm x 30 mm and web 260 mm x 30 mm is subjected to a shear force of 100 kN. Determine the percentage of shear force carried by the web.

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8. Write a note on shear strain energy theory.

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student