11) The outside diameter of a hollow shaft is twice its’ inside diameter. The ratio of its torque carrying capacity to that a solid shaft of the same material and the same outside diameter is
a) 15/16
b) ¾
c) ½
d) 1/16
12) For no tension in column of diameter D, the eccentricity of the compressive load must be less than
a) D/4
b) D/6
c) D/8
d) D/12
13) A hollow circular column, has D=100mm, d = 80mm. what is its radius of gyration
a) 32
b) 24
c) 19.4
d) None of these
14) The radius of gyration of a rectangular section (depth d, width b) from a centroidal axis parallel to the width is
a) 0.57 d
b) 0.28 d
c) 0.28 b
d) 0.57 b
15) Strain energy in a member is
a) directly proportional to strains
b) directly proportional to changes in strain
c) a function of strain as well as stresses
d) a function of loads only
16) Slope and deflection of beams of varying flexural rigidity may be easily computed by the method of
a) Macaulay
b) Mohr
c) Conjugate beams
d) Moment distribution
17) For ductile material the suitable theory of failure is
a) maximum principal stress theory
b) maximum shear stress theory
c) both a and b
d) None of these
18) In a structural member, there are perpendicular tensile stresses of 100 N/mm2 and 50 N/mm2. What is the equivalent stress in simple tension, according to the maximum principal strain theory ? (Poisson’s ratio = 0.25)
a) Zero
b) 87.5 N/mm2
c) 50 N/mm2
d) 100 N/mm2
19) Graphical representation of which one of the following theories is by an ellipse?
a) Maximum principal strain theory
b) Distortion energy theory
c) Maximum shear stress theory
d) None of these
20) All the theories of failure, will given nearly the same result when
a) when one of the principal stresses at a point is large in comparison to the other
b) when shear stresses act
c) when both the principal stresses are numerically equal
d) For all situations of stress