Download PTU (I.K.Gujral Punjab Technical University (IKGPTU)) B-Tech (Bachelor of Technology) Mechanical Engineering 2020 December 3rd Sem 59111 Strength Of Materials I Previous Question Paper
Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (ME) (2012 Onwards)/ B.Tech. (Marine Engg.) (2013 Onwards)
(Sem.?3)
STRENGTH OF MATERIALS ? I
Subject Code : BTME-301
M.Code : 59111
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
Answer briefly :
1.
What do you understand by engineering stress-strain curve?
2.
Differentiate between column and beam.
3.
What is relationship between modulus of elasticity, modulus of rigidity and bulk
modulus?
4.
What do you mean by principal planes and principal stresses?
5.
What is a flitched beam?
6.
What is the difference between UDL and point load?
7.
What is do you mean by pure bending?
8.
What is section modulus?
9.
The maximum deflection in a cantilever beam is y. If the beam depth is doubled, what
will be the corresponding deflection?
10. What will be the torque transmitted by solid circular shaft?
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SECTION-B
11. A steel rod of 20 mm diameter passes centrally through a copper tube of 50 mm external
diameter and 40 mm internal diameter. The tube is closed at each end rigid plates of
negligible thickness. The nuts are tightened lightly home on the projecting parts of the
rod. If the temperature of the assembly is raised by 50 ?C, calculate the stresses devolved
in copper and steel. Take E for steel and copper as 200GN/m2 and 100GN/m2 and for
steel copper as 12 ? 10-6 per ?C and 18 ? 10-6 per ?C.
12. Define a composite bar. How will you find the stresses and load carried each member of
a composite bar?
13. A hollow shaft of external diameter 120 mm transmits 300 kW power at 200 rpm.
Determine the maximum internal diameter if maximum stress in the shaft is not to exceed
60 N/mm2.
14. Derive an expression for the Euler's crippling load for a long column v both ends are
fixed.
15. A simply supported beam of length 10 m carries point load of 5 kN each a distance of 3
m & 7 m from left support and also a UDL of 1 kN between the point loads. Draw S.F &
B.M diagrams for the beam.
SECTION-C
16. Find an expression for deflection at any section of a simply supported beam with
eccentric point load, using Macaulay's method.
17. What is Mohr's circle? Explain the detailed procedure of drawing this circle in case of a
general biaxial stress system. Discuss also in detail how point on the circumference of
this circle gives the state on a plane represented by the point.
18. Write short note on :
a. Failure of columns
b. Thermal stress
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