Q6.In a pre-stressed concrete beam section shown in the figure, the net loss is 10% and the final prestressing
force applied at X is 750 kN. The initial fiber stresses (in N/mm2 ) at the top and bottom
of the beam were:
Answer : Option DExplaination / Solution:
Loss = 10%
Q7.Stress path equation for tri-axial test upon application of deviatoric stress is,q = 10√3 + 0.5p..The respective values of cohesion, c (in kPa) and angle of internal friction, φ are:
Q8.In Marshall method of mix design, the coarse aggregate, fine aggregate, fines and bitumen having
respective values of specific gravity 2.60, 2.70, 2.65 and 1.01, are mixed in the relative
proportions (% by weight) of 55.0, 35.8, 3.7 and 5.5 respectively. The theoretical specific gravity
of the mix and the effective specific gravity of the aggregates in the mix respectively are
Q9.In a system two connected rigid bars AC and BC are of identical length, L with pin supports at A
and B. The bars are interconnected at C by a frictionless hinge. The rotation of the hinge is
restrained by a rotational spring of stiffness, k. The system initially assumes a straight line
configuration, ACB. Assuming both the bars as weightless, the rotation at supports, A and B, due
to a transverse load, P applied at C is