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Roll No.
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Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(ME) (2011 Onwards) (Sem.-4)
STRENGTH OF MATERIALS-II
Subject Code : BTME-401
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M.Code : 59129
Time: 3 Hrs.
Max. Marks : 60
INSTRUCTION TO CANDIDATES :
- SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
- SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt ANY FOUR questions.
- SECTION-C contains THREE questions carrying TEN marks each and students have to attempt ANY TWO questions.
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SECTION-A
- Answer briefly :
- What is energy of distortion?
- What is the necessity of theory of failure
- Define stiffness of the spring.
- For what purposes cylindrical and spherical shells are used?
- State Lame's equation
- Which type of stresses are produced in a rotating thin disc of uniform thickness?
- What is meant by trapezoidal section?
- Where does the maximum vertical shear stress occur in an I-section?
- Discuss the importance of shear centre.
- Identify three principal stresses in a thick cylinder.
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SECTION-B
- Compare the strains produced in a body subjected to same amount of load when applied gradually and when suddenly.
- A closed coil helical spring has mean diameter of 75 mm and spring constant of 80 kN/m. It has 8 coils. What is the suitable diameter of the spring wire if maximum shear stress is not to exceed 250 MN/m²? Modulus of rigidity of the spring wire material is 80 GN/m². What is maximum axial load the spring can carry?
- For a thin cylindrical shell, the length/diameter ratio is 3 and its volume is 20 m³. The safe tensile stress, for the shell material is 100 MPa. Determine the cylinder diameter and wall thickness if it is to contain water at an absolute pressure of 2 MPa.
- Two closed coiled helical steel springs are connected in series to form a composite spring of stiffness 1.5 kN/m. In both the springs, mean coil radius is 4 times the wire diameter. One spring is made out of 3 mm diameter wire and has 20 turns, whereas the other spring has 15 turns. Determine the wire diameter in case of second spring. C = 80 GPa.
- Write a brief note on stress in rotating discs.
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SECTION-C
- A bar of mild steel carries an axial pull of 10 kN and a transverse shear force of 5 kN. Taking the elastic limit in tension as 240 MPa, a factor of safety 3 and Poisson's ratio 0.3, calculate the diameter of the bar if the criterion is (i) Maximum principle stress theory, (ii) Maximum strain energy theory.
- A thick cylinder of 150 mm outside radius and 100 mm inside radius is subjected to an external pressure of 30 MN/m² and internal pressure of 60 MN/m². Calculate the maximum shear stress in the material of the cylinder at the inner radius.
- A beam 100 mm wide and 150 mm deep in cross-section is simply supported and carries a uniformly distributed load over its entire span of 2 m. If the allowable stresses for the beam material are 30 MPa in bending and 2 MPa in shear, calculate the maximum load which the beam can carry.
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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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