#### Strenght of Materials

36

When a rectangular bar of length l, breadth b and thickness t is subjected to an axial pull of P, then linear strain (epsilon) is given by (where E = Modulus of elasticity)

A. epsilon = (p)/(b.t.E)
B. epsilon = (b.t.E)/(p)
C. epsilon = (b.t)/(p.E)
D. epsilon = (p.E)/(bt)

37

A simply supported beam of length l is loaded with a uniformly distributed load of w per unit length. The maximum deflection is(5Wl^5)/(384EI) and lies at the centre of the beam.

A. True
B. . False

38
A thin cylindrical shell of diameter (d), length (l) and thickness (t) is subjected to an internal pressure (p). The ratio of longitudinal strain to hoop strain is
A. (m - 2)/(2m - 1)
B. (2m - 1)/(m - 2)
C. (m - 2)/(2m +1)
D. (2m +1)/(m - 2)

39

The horizontal thrust offered by the retaining wall on the retained material is (where w = Specific weight of the retained material, h = height of retaining wall, and (phi) = Angle of repose of the retained earth)

A. (Wh^2)/(2) ((1 + sin phi)/(1 - sin phi))
B. (Wh^2)/(2) ((1 - sin phi)/(1+ sin phi))
C. (Wh^2)/(2) ((1 + cos phi)/(1 - cosphi))
D. (Wh^2)/(2) ((1 - cos phi)/(1 +cos phi))

40

The tensile strength of the welded joint for double fillet is (where s = Leg or size of the weld, l = Length of weld, and sigma_t= Allowable tensile stress for weld metal)

A. 0.5 s.l.sigma_t
B.  s.l.sigma_t
C. sqrt(2) s.l.sigma_t
D. 2 s.l.sigma_t