Civil Engineering MCQs

Page No. 200

Total strain energy theory for the failure of a material at elastic limit, is known_________________?


a Guest’s or Trecas’ theory


bSt. Venant’s theory


cRankine’s theory


dHaig’s theory


View Answer Haig’s theory

A steel rod 1 metre long having square cross section is pulled under a tensile load of 8 tonnes. The extension in the rod was 1 mm only. If Esteel = 2 × 106 kg/cm2, the side of the rod, is_________________?


a1 cm


b 1.5 cm


c2 cm


d2.5 cm


View Answer 2 cm

A steel bar 5 m × 50 mm is loaded with 250,000 N. If the modulus of elasticity of the material is 0.2 MN/mm2 and Poisson’s ratio is 0.25, the change in the volume of the bar is_________________?


a1.125 cm3


b2.125 cm3


c 3.125 cm3


d4.125 cm2


View Answer 3.125 cm3

In plastic analysis, the shape factor for a triangular section, is_________________?


a1.5


b1.34


c2.34


d2.5


View Answer 2.34

0. At its elastic limit, the following statement is true, 0/E__________________?


a Strain is equal to


bMaximum shear stress = /2


cStrain energy = 0


d All the above


View Answer All the above

A cantilever of length 2 cm and depth 10 cm tapers in plan from a width 24 cm to zero at its free end. If the modulus of elasticity of the material is 0.2 × 106 N/mm2, the deflection of the free end, is________________?


a 2 mm


b 3 mm


c4 mm


d5 mm


View Answer 5 mm

A shaft is subjected to bending moment M and a torque T simultaneously. The ratio of the maximum bending stress to maximum shear stress developed in the shaft, is____________________?


aM/T


bT/M


c2M/ T


d 2T/M


View Answer 2M/ T

A material may fail if______________?


a0


bMaximum strain exceeds /E


c 0/2


d All the above


View Answer All the above

A square column carries a load P at the centroid of one of the quarters of the square. If a is the side of the main square, the combined bending stress will be________________?


a p/a²


b2p/a²


c3p/a²


d 4p/a²


View Answer 3p/a²

The ratio of the maximum deflections of a simply supported beam with a central load W and of a cantilever of same length and with a load W at its free end, is________________?


a 1/8


b 1/10


c 1/12


d1/16


View Answer 1/16

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