31) A beam of rectangular cross-section is 100 mm wide and 200 mm deep. If the section is subjected to a shear force of 20 k N, the maximum shear stress is
a) 1 N/ mm2
b) 1.125 N/mm2
c) 1.33 N/mm2
d) 1.5 N/mm2
32) A MS beam is subjected to a bending moment, such that a stress of 100 MPa is developed in a layer at a distance of 100mm from the neutral layer. If E = 200 GPa, what is the radius of curvature of the beam?
a) 400 m
b) 200 m
c) 100 m
d) 50 m
33) A beam of T-section has I = 1200 cm4 and depth = 12 cm. Flange of the section is in compression. If the maximum tensile stress is two times the maximum compressive stress , what is section modulus in compression ?
a) 300 cm3
b) 200 cm3
c) 100 cm3
d) None of these
34) A I –section is subjected to transverse shear force. At which layer maximum shear stress is developed ?
a) Neutral axis
b) At top edge of flange
c) At bottom edge of flange
d) None of these
35) A beam of uniform strength refers to which one of the following?
a) A beam in which extreme fibre stresses are same at all cross-section along the length of the beam
b) A beam in which the moment of inertia about axis of bending is constant at all cross-section of the beam
c) A beam in which the distribution of bending stress across the depth of cross-section is uniform at the all cross-section of the beam
d) A beam in which the bending stress is uniform at the maximum bending moment cross-sectin
36) A beam is of I-section with flanges 200 mm x 10 mm and web 180 mm x 10 mm. due to the bending moment applied on the beam section, maximum stress developed in the beam section is 100 MPa, what is the stress developed at inner edge of the flange ?
a) 110 MPa
b) 100 MPa
C) 90 MPa
d) 120 MPa
37) The maximum bending moment due to a moving load on a fixed ended beam occurs
a) at a support
b) always at the mid span
c) under the load only
d) none of the above
38) The shape of the bending moment diagram for a cantilever beam carrying a uniformly distributed load over its length is
a) a straight line
b) a hyperbola
c) an ellipse
d) a parabola
39) The point of contra flexure is a point where
a) Shear force changes sign
b) Bending moment changes sign
c) Shear force is maximum
d) Bending moment is maximum
40) In the case of I-section, the web resists mainly
a) axial force
b) shear force
c) bending moment
d) both shear force and bending moment