Design of Concrete Structures

A. the front face in one direction
B. the front face in both directions
C. the inner face in one direction
D. the inner face in both directions

A. 18
B. 30
C. 40
D. 58

A. to decrease it
B. to increase it
C. either to decrease or to increase it
D. to keep it unchanged

A. compressive and tensile
B. tensile and compressive
C. both compressive
D. both tensile

A. zero
B. tensile
C. compressive
D. tensile or compressive

A. wR / 4d
B. wR/2d
C. wR/d
D. 2wR/d
where, w = load per unit area of surface of dome R = radius of curvature d = thickness of dome

A. to provide adequate bond stress
B. to resist tensile stresses
C. to impart initial compressive stress in concrete
D. all of the above

A. Long line method
B. Freyssinet system
C. Magnel-Blaton system
D. Lee-Macall system

A. only in post-tensioned beams
B. only in pretensioned beams
C. in both post-tensioned and preten-sioned beams
D. none of the above

A. decrease in tensile strength but increase in ductility
B. increase in tensile strength but decrease in ductility
C. decrease in both tensile strength and ductility
D. increase in both tensile strength and ductility