Strength of Materials - I Mid - II, November - 2014

1.Section modulus of rectangular section having width b and depth d is
  • bd2/6
  • bd3/12
  • bd2/12
  • bd3/6
Answer: A
2.When a rectangular section of aeam is subjected to a shearing force, the ratio of maximum shear stress to the average shear stress is
  • 2.0
  • 1.75
  • 1.5
  • 1.25
Answer: C
3.When a circular section of aeam is subjected t a shearing force, the ratio of maximum shear stress to the average shear stress is
  • 2.0
  • 3/4
  • 4/3
  • 1
Answer: C
4.A square with side a of a beam is subjected to a shearing force f, the value of shear stress at the top edge of the section is
  • Zero
  • f/2a2
  • f/a2
  • 3f/2a2
Answer: A
5.When a body is subjected to a direct tensile stress (p) in one plane then the tangential stress on an oblique section of a body inclined at an angle (θ) to the normal of the section is equal to
  • p sin2θ
  • p cos2θ
  • p/2 sin2θ
  • p/2cos2θ
Answer: C
6.A simply supported beam carries a point load at its centre. The slope at its supports is
  • Wl3/16EI
  • Wl3/48EI
  • Wl2/16EI
  • Wl2/48EI
Answer: A
7.Which theoriys of failures can be recommended for ductile materials?
  • Rankines’s Theo
  • St venant’s Theory
  • Guest’s Theory
  • Vonmines stress Theory
Answer: D
8.A simply supported beam of span (l) is subjected over a UDL (w) per unit length over the whole span.The maximum deflection at the center of beam is
  • 5wl3/48EI
  • 5wl3/348EI
  • 5wl3/384EI
  • 5wl4/24EI
Answer: C
9.A cantilever beam od length (l) carrying a point UDL(w) per unit run over the whole span. Then the maximum deflection of the beam is
  • wl3/3EI
  • wl4/8EI
  • wl4/4EI
  • wl4/2EI
Answer: D
10.The width of Conjugate beam is
  • 1/EI
  • EI
  • 1/2 EIq
  • 2EI
Answer: A
11.If the actual beam has simply supported ends then the conjugate beam will be_____________
Answer: Simply supported beam
12.The section modulus for hollow rectanle section having outer width(B), inner width(b) and outer depth(D), inner depth(d)__________
Answer: (BD3 - bd3)6.D
13.I section is subjected to a shear force f,then the maximum shear force will be occurs at _________________
Answer: Neutral axis
14.The stress induced on the principal planes will be only____________
Answer: Normal stresses
15.When a body is subjected to two unequal and unlike stresses then the radius of Mohr’s circle is ________________
Answer: p1+p2/2
16.According to maximum shear stress theory the max shear stress in a biaxial system should not reach_____________________in uniaxial system
Answer: The safe shear stress
17.The maximum deformation in a cantilever of length l carrying a distributed load whose intensity varies uniformly form zero at the free end and w per unit run at the fixed end _________________
Answer: WL4/30EI
18.The maximum deflection in a cantilever beam having point load at the free end occurs at __________
Answer: Free end
19.Section Modulus is the ratio of_____________________
Answer: Moment of inertia about neutral axis/distance of the most distant part form the neutral axis
20.If the permissible bending stress in same then the moment of the resistant of the body will increases with ___________ of the section modulus
Answer: Increase