Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) ) BE/BTech ME (Mechanical Engineering) 2020 March 3rd Sem Strength Of Materials I Previous Question Paper
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(ME) (2012 Onwards)
(Sem.?3)
STRENGTH OF MATERIALS ? I
Subject Code : BTME-301
M.Code : 59111
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION-A
1. Answer briefly :
(a) Distinguish between longitudinal and lateral strain.
(b) Define Temperature Stresses.
(c) What do you understand by ?point of contraflexure?. Does it exist in a cantilever?
(d) Define Bending Moment and write its units.
(e) What is the significance of polar moment of inertia in torsion of circular shafts?
(f) Differentiate between crushing and buckling.
(g) Write Rankine-Gordon's formula.
(h) Define Slenderness ratio.
(i) Distinguish between slope and deflection of a beam.
(j) Name different methods used to find slope in a beam.
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1 | M-59111 (S2)-1099
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(ME) (2012 Onwards)
(Sem.?3)
STRENGTH OF MATERIALS ? I
Subject Code : BTME-301
M.Code : 59111
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION-A
1. Answer briefly :
(a) Distinguish between longitudinal and lateral strain.
(b) Define Temperature Stresses.
(c) What do you understand by ?point of contraflexure?. Does it exist in a cantilever?
(d) Define Bending Moment and write its units.
(e) What is the significance of polar moment of inertia in torsion of circular shafts?
(f) Differentiate between crushing and buckling.
(g) Write Rankine-Gordon's formula.
(h) Define Slenderness ratio.
(i) Distinguish between slope and deflection of a beam.
(j) Name different methods used to find slope in a beam.
2 | M-59111 (S2)-1099
SECTION-B
2. Write a note on two dimensional stress systems with a suitable example.
3. A cantilever PQRS, 7 m long is fixed at P such that PQ = QR = 2 m, and RS = 3 m. It
carries loads of 3 kN, 3 kN and 2 kN at Q, R and S respectively in addition to uniformly
distributed load of 1 kN/m run between P and Q and 2 kN/m run between R and S. Draw
shearing force and bending moment diagrams.
4. A hollow circular bar having outside diameter twice the inside diameter is used as a
beam. From the bending moment diagram of the beam, it is found that the bar is
subjected to a bending moment of 40 kNm. If the allowable bending stress in the beam is
to be limited to 100 MN/m
2
, find the inside diameter of the bar.
5. Derive the torsion formula.
6. A slender pin ended aluminium column 1.8 m long and of circular cross-section is to
have an outside diameter of 50 mm. Calculate the necessary internal diameter to prevent
failure by buckling if the actual load applied is 13.6 kN and the critical load applied is
twice the actual load. Take, E for aluminium as 75 GN/m
2
.
SECTION-C
7. (a) Explain stress strain diagram for brittle materials.
(b) Describe ellipse of stress and its applications.
8. A steel girder of uniform section, 14 metres long is simply supported at its ends. It carries
concentrated loads of 90 kN and 60 kN at two points 3 metres and 4.5 metres from the
two ends respectively. Using Macaulay's method, calculate:
(a) The deflection of the girder at the points under the two loads, and
(b) The maximum deflection. Take, I = 64 ? 10
?4
m
4
, and E = 210 ? 10
6
kN/m
2
.
9. A hollow shaft of diameter ratio 3/8 is required to transmit 600 kW at 110 rpm, the
maximum torque being 20% greater than the mean. The shear stress is not to exceed
63 MN/m
2
and the twist in a length of 3 m not to exceed 1.4 degrees. Calculate the
maximum external diameter satisfying these conditions. Take, modulus of rigidity as
84 GN/m
2
.
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 21 March 2020