PTU Punjab Technical University B-Tech May 2019 Question Papers 3rd Semester AREO-Aerospace-Engineering
Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(ANE)/(Aerospace Engg.) (2012 Onwards)
(Sem.?3)
STRENGTH OF MATERIALS?I
Subject Code : ME-201
M.Code : 59001
Time : 3 Hrs. Max. Marks : 60
INSTRUCTION TO CANDIDATES :
1.
SECTION-A is COMPULSORY consisting of TEN questions carrying T WO marks
each.
2.
SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3.
SECTION-C contains T HREE questions carrying T EN marks each and students
have to attempt any T WO questions.
SECTION-A
1.
Answer briefly :
a. How does limit of proportionality differ from limit of proportionality?
b. What is principal plane? What is its significance?
c. What effect is observed when shaft is twisted?
d. Draw a stress strain curve for Mild steel.
e. What is the relationship between hoop stress and longitudinal stress for thin
cylinders?
f. What is section modulus?
g. What is point of contraflexure?
h. What do you mean by true stress?
i. What is Castigliano's theorem?
j. Differentiate between the column and strut.
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SECTION - B
2.
An axial pulls of 50kN is acting on a bar consisting of three sections of length 1,5m, 2m
and 2.5m and diameters 20mm, 40mm, 30mm respectively, if E = 2?105 N/mm2
determine
a. Stress in each section.
b. Total extension of the bar.
3.
Derive an expression for the Euler's crippling load for a long column with one end fixed
and other end free.
4.
Drive an expression for shear stress produced in a circular shaft subjected to torsion.
5.
A cylindrical pressure vessel is fabricated from steel plating that has a thickness of
20 mm. The inner diameter of the vessel is 450mm, and its length is 2 m. Determine the
maximum internal pressure that can be applied if the longitudinal stress is limited to
140MPa and the circumferential stress is limited to 60 MPa.
6.
Calculate the modulus of rigidity and bulk modulus of a cylindrical bar of diameter
30mm and length of 1.5m. If the longitudinal strain in the bar during a tensile stress is
four times the lateral strain. Find change in volume, when the bar is subjected to stress of
100 N/mm2 Take E = 1?l05 N/mm2.
SECTION-C
7.
What is Macaulay's method? Derive an expression for deflection at any section of a
simply supported beam with eccentric point load, using Macaulay's method.
8.
A simply supported beam of length 8 m rests on supports 5 m apart, the right hand end is
overhanging by 2 m and left hand end is overhung by 1m. The beam carries a uniformly
distributed load of 5kN/m over the entire length. Draw S.F. and B.M. diagram and find
the point of contra flexure, if any.
M
E
9.
Derive the complete flexural formula
pure bending with assumptions.
I
Y
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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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This post was last modified on 04 November 2019