Civil engineering

 

 

  1.Two bars of different materials are of the same size and are subjected to same tensile forces. If the bars have unit elongations in the ratio of 4 : 7, then the ratio of moduli of elasticity of the two materials is a) 7:4 b)4:7 c)4:17 d) 16 :49 2. If a point in a strained material is subjected to equal normal and tangential stresses, then the angle of obliquity is a)0 b) 45 c)tan 1/2 d)tan2  3. A flat carrying a pull of 69C kN is con-nected to a gusset plate using rivets. If the pulls required to shear the rivet, to crush the rivet and to tear the plate per pitch length are 68.5 kN, 46 kN and 69 kN respectively, then the number of rivets required is a)10 b)12 c) 15 d)20  4.The Young's modulus of a wire is defined as the stress which will increase the length of wire compared to its original length a)half b) same amount c)double d) one-fourth 5. . Percentage reduction of area in performing tensile test on cast iron may be of the order of a)50% b)25% c) 0% d) 15% 6.   During a