Download PTU (I.K.Gujral Punjab Technical University (IKGPTU)) B-Tech (Bachelor of Technology) (AE)-Automobile Engineering 2020 December 3rd Sem 54109 Mechanics Of Materials Previous Question Paper
Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (AE) (2012 to 2017) (Sem.?3)
MECHANICS OF MATERIALS
Subject Code : BTAE-301
M.Code : 54109
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 the term stress. What are different types of stresses?
2.
What is the use of stress-strain diagram?
3.
What will be change in modulus of elasticity of a wire when length of wire is doubled, and
load is increased by factor of 4?
4.
What do you mean by thermal stresses?
5.
Define point of contraflexure.
6.
What is relationship between shear force and bending moment?
7.
Define the term torsional rigidity.
8.
State maximum principle shear-strain theory.
9.
Write the limitations of Euler's theory.
10. What are thick and thin cylinders?
SECTION-B
11. A symmetrical section 200 mm deep has a moment of inertia of 2.26 ? 10-5 m4 about its
neutral axis. Determine the longest span over which, when simply supported, the beam
would carry a uniformly distributed load of 3kN/m run without the stress due to bending
exceeding 10 MN/m2.
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12. Find the value of P necessary for equilibrium, if E 210 kN/mm2. Also determine the
elongation of the bar.
800 mm2
600 mm2
400 mm2
50 kN
80 kN
P
100
A
B
C
D
1m
1.5 m
0.8 m
FIG.1
13. Draw the SFD and BMD for the beam shown below.
3kN
2.5 kN
1 kN/m
A
E
D
C
B
1 m
1.5 m
2 m
0.5m
5 m
FIG.2
14. Prove that for a rectangular cross-section beam, the maximum shear stress is 1.5 times the
average shear stress.
15. Stating the assumptions, drive the torsion equation for a circular shaft. Assume suitable
parameters.
SECTION-C
16. Derive the Euler's formula for long columns having both ends hinged or pinned.
17. A boiler shell is to be made of 15mm thick plate having tensile stress of 120 MN/m2. If the
efficiencies of the longitudinal and circumferential joints are 70% and 30% respectively,
determine :
a. Maximum permissible diameter of the shell for an internal pressure of 2 MN/m2.
b. Permissible intensity of internal pressure when the shell diameter is 1.5 m.
18. A hollow shaft having an inside diameter 60% of its outer diameter is to replace a solid
shaft transmitting the same power at same speed. Calculate the percentage saving in
material. The material of hollow and solid shaft is same.
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