Structural Mechanics, Question Paper of Civil Engineering 4th Semester, Download Question Paper 7

Roll No­­­­­­­­­_________

STRUCTURAL MECHANICS

5^th Exam /Civil/5162/May’09

                                                             

Duration 3 Hrs.

Section –A

1.     Fill in the blanks

a.     The ratio of lateral strain to linear strain is known as _______

b.     The load acting at a point is known as _______

c.      The point of contra flexure is also called _______

d.     The unit of moment of inertia is _________

e.      Moment of resistance = ________ x section modulus.

f.       The axial load produces only _________ stress

g.     A dam is a structure constructed to store ________ on one of its faces.

h.     The shear stress at the neutral axis _________

i.       Te strength of a column depends upon __________the ratio.

j.       In case of fixed beam, the deflection is zero at _______

Section –B

Note: attempt any five questions

2.       

a.      Differentiate between plastic material and brittle materials.

b.     Explain stress and give the units of stress

c.      Explain parallel axis theorem

d.     Explains section modulus and give its practical utility.

e.      Give the limits of eccentricity

                                                             i.      Rectangular section

                                                           ii.      Circular section

                                                        iii.      Hollow circular section

f.       Draw the shear stress distribution diagrams of angle section and i-section

g.     Give the conditions of equilibrium i.e. equations of statics.

Section-C

Note : Attempt any three questions

3.       

a.     Find the forces in the members AB and AC od a truss as shown below by method of joints

b.     Explain Euler’s formula and give the limitations for the use of Euler’s formula

4.       

a.     Explain briefly the necessity for calculating defection?

b.     A hollow circular column having external and internal diameters of 250 mm and 200 mm respectively carries a vertical load of 100 KN at the outer edge of the column. Calculate the maximum and minimum stress intensities in the section.

5.     Draw shear force and bending moment diagrams of a beam as shown below.

6.       

a.     Find moment of inertia of an angel 100 x 100 x 10 mm about its x-axis

b.     Explain temperature stresses when the supports fields

7.      

a.     A bar of 20 mm in square cross section is subjected to a tensile load of 15 and the measured extension over a length of 200 mm was found to be 0.20 mm. the contraction in the lateral dimension was 0.0006 mm, determine the modulus of rigidity.

b.     Explain briefly torsion test for knowing the strength of a material.