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

Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) ) BE/BTech ME (Marine Engineering) 2020 March 4th Sem Strength Of Materials II Previous Question Paper

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Roll No. Total No. of Pages : 02
Total No. of Questions : 09
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
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
1. Answer briefly :
a) What is energy of distortion?
b) State Castigiliano?s theorem.
c) What is a theory of failure?
d) What is a hoop stress?
e) State assumptions made in Lame's theory.
f) What is a helical spring?
g) Define proof resilience.
h) Give any two examples of rotating thin ring.
i) Where does the maximum vertical shear stress occur in I-section?
j) What is a shear centre?
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1 | M - 7 2 4 3 4 ( S 2 ) - 1 6 6 6
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
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
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
1. Answer briefly :
a) What is energy of distortion?
b) State Castigiliano?s theorem.
c) What is a theory of failure?
d) What is a hoop stress?
e) State assumptions made in Lame's theory.
f) What is a helical spring?
g) Define proof resilience.
h) Give any two examples of rotating thin ring.
i) Where does the maximum vertical shear stress occur in I-section?
j) What is a shear centre?
2 | M - 7 2 4 3 4 ( S 2 ) - 1 6 6 6
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.
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
7. 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.
8. A beam of T-section with flange 300 mm ? 30 mm and web 260 mm ? 30 mm is
subjected to a shear force of 100 kN. Determine the percentage of shear force carried by
the web.
9. 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
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