Download PTU (Punjab Technical University) B.Tech (Bachelor of Technology) / BE (Bachelor of Engineering) 2021 January ME 3rd Sem 76421 Strength Of Materials I Previous Question Paper
Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech.(ME) (2018 Batch) (Sem.?3)
STRENGTH OF MATERIALS-I
Subject Code : BTME-304-18
M.Code : 76421
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.
State and explain Poisson's ratio.
2.
What do you mean by bar of uniform strength?
3.
Define shearing force with the help of a diagram.
4.
Why point of contraflexure does not exist in a simply supported beam?
5.
What do you mean by composite beams? Write their applications.
6.
Write the assumptions in derivation of torsion equation.
7.
Write bending equation.
8.
Define equivalent length in case of columns.
9.
Write the relationship between moment, slope and deflection.
10. How Macaulay's method is different from Moment area method, briefly explain?
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SECTION-B
11. What is the significance of stress-strain curve? Describe a stress-strain curve for ductile
material.
12. A flitched beam consists of a wooden joist 12 cm wide and 20 cm deep strengthened by a
steel plate 1 cm thick and 18 cm deep, one on either side of the joist. If the stresses in
wood and steel are not to exceed 7.5 MN/m2 ad 127.5 MN/m2, find the moment of
resistance of the section of the beam. Take, ESteel = 20 EWood.
13. Derive a relation to find torque transmitted by a hollow shaft.
14. A hollow cast iron column whose outside diameter is 200 mm has a thickness of 20 mm.
It is 4.5 m long and is fixed at both ends. Calculate the safe load by Rankine-Gordon
formula using a factor of safety of 4. Take permissible compressive stress as 550 MN/m2
and constant a = 1/1600.
15. A wooden beam 150 mm wide and 250 mm deep has a span of 4 metres. Determine the
load that can be placed at its centre to cause the beam a deflection of 12 mm. Take,
E = 6 ? 106 kN/m2.
SECTION-C
16. A steel tie rod 50 mm in diameter and 2.5 m long is subjected to a pull of 100 kN. To
what length the rod should be bored centrally so that the total extension will increase by
15 percent under the same pull, the bore being 25 mm diameter? Take E = 200 GN/m2.
17. A horizontal beam AB of length 8 m is simply supported at A and B. It carries uniformly
distributed load of 3 kN/m over the entire span and a clockwise moment of 12 kNm is
applied in the plane of the beam at a point C, 5 m from A. Draw the shearing force and
bending moment diagrams and determine the position and magnitude of maximum
bending moment.
18. A beam AB of length l simply supported at the ends carries a point load W at a distance a
from the left end. Find the deflection under the load and maximum deflection.
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 26 June 2021