Download PTU (I.K.Gujral Punjab Technical University (IKGPTU)) B-Tech (Bachelor of Technology) (AR)- Automation-And-Robotics 2020 December 3rd Sem 76501 Strength Of Materials Previous Question Paper
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (Automation & Robotics) (2018 Batch) (Sem.?3)
STRENGTH OF MATERIALS
Subject Code : BTAR-302-18
M.Code : 76501
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Write briefly :
1.
Define Hooke's law.
2.
What is Volumetric Strain?
3.
What is the ratio of the torques transmitted by a hollow and a solid shaft of the same
material, length and weight?
4.
If a bar is stretched in such a manner that all the lateral strain is prevented, what is the
poison's ratio?
5.
What is the Spring Stiffness?
6.
What do you understand by 0.2% proof stress?
7.
Define Hoop Stress.
8.
What is difference between neutral layer and neutral axis?
9.
Why is the longitudinal stress in a thin cylinder zero?
10. Define polar moment of inertia.
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SECTION-B
11. A beam is simply supported and carries a uniformly distributed load of 40kN/m run over
the whole span. The section of the beam is rectangular having depth as 500 mm. If the
maximum stress in the material of the beam is 120 N/mm2 and moment of inertia of the
section is 7 ? 108 mm4, find the span of the beam.
12. A thin spherical vessel 200mm diameter and 5mm thick is filled with water. More water is
pumped in until the pressure reaches 4.5MPa. How much extra water was required to reach
this pressure?
13. Drive an expression for shear stress produced in a circular shaft subjected to torsion.
14. Two vertical rods one of steel and other of copper are rigidly fixed at the top and 50cm
apart. Diameters and lengths of each rod are 2cm and 4m respectively. A cross bar fixed to
the roads at the lower end carries a load of 5000N such that the cross bar remains horizontal
even after loading. Find the stress in each rod and the position of the load on the bar. Take
E for steel and copper as 2 ? 105 N/mm2 and 1 ? 105 N/mm2.
15. A simply supported beam carries a uniformly distributed load `w' all along its length.
Calculate the maximum deflection assuming that EI is constant.
SECTION-C
16. A body is subjected to direct dresses in two mutually perpendicular directions accompanied
by a simple shear stresses. Draw the Mohr's circle of stresses and explain how will you
obtain the principal stresses and principal planes?
17. A simply supported beam of length 8m rests on supports 6m apart, the right hand end is
overhanging by 2m. The beam carries a uniformly distributed load of 1500N/m over the
entire length. Draw S.F. and B.M. diagram and find the point of contra flexure, if any.
18. Write short note on :
a. Spherical shells
b. Maxwell's reciprocal theorem
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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This post was last modified on 13 February 2021