Ultimate strength of cold drawn high steel wires_______________? A. increases with increase in diameter of barB. decreases with increase in diameter of bar C. does not depend on diameter of bar D. none of the above
Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than__________________? A. 35 MPa and 42 MPaB. 42 MPa and 35 MPa C. 42 MPa and 53 MPa D. 53 MPa and…
Stress strain curve of high tensile steel_______________? A. has a definite yield point B. does not show definite yield point but yield point is defined by 0.1% proof stressC. does not show definite yield point but yield point is defined…
Which of the following has high tensile strength ? A. plain hot rolled wiresB. cold drawn wires C. heat treated rolled wires D. all have same tensile strength
Which of the following losses of prestress occurs only in pretensioning and not in post-tensioning ? A. elastic shortening of concrete B. shrinkage of concrete C. creep of concrete D. loss due to friction
Normally prestressing wires are arranged in the_______________? A. upper part of the beamB. lower part of the beam C. center D. anywhere
In prestressed concrete______________? A. forces of tension and compression change but lever arm remains unchangedB. forces of tension and compressions remain unchanged but lever arm changes with the moment C. both forces of tension and compres-sion as well as lever…
In a spherical dome the hoop stress due to a concentrated load at crown is_______________? A. compressive everywhereB. tensile everywhere C. partly compressive and partly tensile D. zero
A beam curved in plan is designed for_______________? A. bending moment and shear B. bending moment and torsion C. shear and torsionD. bending moment, shear and torsion
Due to shrinkage stresses, a simply supported beam having reinforcement only at bottom tends to_____________? A. deflect downward B. deflect upward C. deflect downward or upward D. none of the above