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Posted By: santosh kumar kanugula Member Level: Gold Posted Date: 01 Jul 2008
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2007 Jawaharlal Nehru Technological University B.Tech Civil Engineering STRENGTH OF MATERIALS-I Question paper
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Code No: NR210102 NR
II B.Tech I Semester Supplementary Examinations, February 2007
STRENGTH OF MATERIALS-I
(Civil Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. A specimen of material having 12mm dia. is tested under tension over a gauge
length of 50mm. At 20kN load the extension was 0.035mm. The max. load taken
by the specimen was 60kN and the fracture occurred at 40kN. Find the modulus
of elasticity, ultimate strength, breaking strength and percentage elongation, if the
final length of the specimen was 70mm. [16]
2. Rails of 15 m length were laid on the track when the temperature was 200C. A gap
of 1.8 mm was kept between two consecutive rails. At what max temperature the
rails will remain stress free ? If the temperature is raised further by 150C, what
will be the magnitude and nature of stresses induced in the rails? [16]
3. Construct the S. F. D. and B. M. D. for the cantilever beam shown in Figure 1 and
identify the maximum values for each. [16]
Figure 1:
4. Define Neutral axis. Sketch the bending stress distribution across the cross section
of a rectangular beam section 230 × 400 m subjected to 60 KNm moment. [16]
5. Figure 2 shows a cantilever truss ABCDE, subjected to a vertical load P = 100 KN
at joint D. Determine the forces in the members and reactions at the supports. [16]
6. Determine the deflection under the load and maximum deflection of the beam as
shown in (figure3) using moment area theorems. E=210 GPa
KN/sq.mm and I=1000 cm4 [16]
7. A double riveted double cover but joint is used to connect plates of 10mm thick.
Using Unwin’s formula, determine the diameter of the rivet, rivet value, pitch and
eciency of the joint. Adopt s = 100N/mm2, v = 300N/mm2, t = 150N/mm2.
[16]
8. Define the terms
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Code No: NR210102 NR
Figure 2:
Figure 3:
2 of 3
Code No: NR210102 NR
(a) Circumferential stress
(b) Longitudinal stress and derive the expressions for the same in thin cylinders.
[16]
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3 of 3
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