Diploma-Diploma Mechanical Engineering 3rd Sem Strength of Materials(Gujarat Technological University-2013)
Thursday, 29 August 2013 07:28anudouglas
GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGG.- SEMESTER–III EXAMINATION – WINTEER 2012
Subject code: 331904 Date: 05/01/2013
Subject Name: Strength of Materials
Time: 2:30 pm – 5:00 pm Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. English version is Authentic
Q.1 Attempt any seven. 14
(i) Explain composite section.
(ii) Write elastic constants & give relation between them.
(iii) Define resilience & proof resilence.
(iv) Explain parallel axis theorem with neat sketch.
(v) Define neutral axis & moment of resistance.
(vi) Define modulus of rigidity & flexural rigidity.
(vii) Define eccentricity & core of section.
(viii) Explain sagging bending moment & hogging bending moment.
(ix) Define principal planes & principal stresses.
(x) Define torsion & torsional rigidity.
Q.2 (a) (i) A timber column of rectangular cross section is having one side twice the
other.It contracts by 0.005 cm/m when subjected to axial compressive force of 10 kN.Find dimensions of the column.Take E = 0.1 X 105 N/mm2. 04
(ii) A steel bar is 3 m long & 200 mm2 in cross sectional area.Due to sudden load stress of 60 N/mm2 is produced.Find the force. 03
(b) A bar is subjected to forces as shown in figure{1}. Take E = 200 kN/mm2. Find deformation in length of the bar. 07
OR
(b) A copper bar of 36 mm diameter is inserted inside a steel tube of external diameter 50 mm & 5 mm thickness. The composite section is subjected to tensile force of 100 kN.Find stresses in both the materials.Also find load taken by each material.Es = 2.12 X 105 N/mm2, Ec = 1.1 X 105 N/mm2. 07
Q.3 (a) Draw shear force & bending moment diagram. 07
(b) A simply supported beam of span 4 m is subjected to a central point load ‘W’ kN.If the maximum deflection of beam at centre is 1 mm. Find the central point load ‘W’ & slope of beam at supports.Take E= 2.1 X 105N/mm2, I = 5.18 X 108 mm4. 07
OR
Q.3 (a) Draw shear force & bending moment diagram for the beam shown in figure {3}. 07
(b) A hollow circular column having internal diameter 400 mm & thickness 100 mm is used as a column. If slenderness ratio is 90, one end of column is fixed and other end is hinged. Calculate actual length of the column.
Q. 4 (a) Find Ixx & Iyy for I-section shown in figure {4}. All dimensions are in mm.
(b) A square column of size 500 mm X 500 mm is acted by load on one of its edge. If maximum compressive stress is 15 N/mm2 ,calculate minimum intensity of stress and its nature. 07
OR
Q. 4 (a) A rectangular beam is simply supported over 5 m span. The beam is subjected to u.d.l. of 50 kN/m and a central point load of 35 kN.If maximum bending stress is 250 N/mm2,find width & depth of the beam.The depth of beam is twice the width. 07
(b) A solid shaft made of steel having diameter of 50 mm and length 700 mm transmits 100 kW at 160 r.p.m.Calculate maximum shear stress produced and angle of twist in degree.Take C = 0.8 X 105 N/mm2 (07)
Q.5 (a) 100 N/mm2 (tensile) & 60 N/mm2 (compressive) stresses are acting on two mutually perpendicular planes with shear stress of 18 N/mm2 .Find principal stresses and locate principal planes. 07
(b) Differentiate between riveted joints and welded joints. 07
OR
Q. 4 (a) Solve Q-5(a) given above by Mohr circle method. 07
(b) Differentiate between charpy impact test & izod impact test. Also draw neat sketches of specimen of both tests. 07
| Earning: ₹ 6.02/- |
