cboth a and b d None of these 6 Prestressing losses in postt

c)both a and b d) None of these 6) Prestressing losses in post-tensioned and pre-tensioned beams are respectively a)15% and 20% b) 20% and 15% C)15% and 15% d) 20% and 20% 7) I n symmetrically reinforced sections shrinkage stresses in concrete and steel are respectively a) Compressive and tensile c) Both compressive b) Tensile and compressive d) Both tensile 8) The theoretical failure load of the beam for attainment of limit state of collapse in flexure is a) 23.7kn b) 25.6kn c) 28.7kn d) 31.6kn 9) The partial factor of safety for concrete as per IS:456-2000 is

Solution

6)losses in pretensioned beam is always greater than post tensioned beam, therefore option a is the only possible option

7)shrinkage stress in concrete is tensile and where as in steel it will be compressive

8)theoritical failure load in limit state of collapse it will be 31.6kn

9)partial safety factor in concrete is 1.5 and in steel it will be 1.15