Design of Concrete Structures

1. Factor of safety for steel should be based on its yield stress,
2. Factor of safety for steel should be based on its ultimate stress,
3. Factor of safety for concrete should be based on its yield stress,
4. Factor of safety for concrete should be based on its ultimate stress.
The correct statements are

A. (1) and (3)
B. (1) and(4)
C. (2) and (3)
D. (2) and (4)

1. to increase shrinkage
2. to decrease shrinkage
3. to increase setting time
4. to decrease setting time
The correct answer is?
A. (1) and (3)
B. (1)and(4)
C. (2)and (3)
D. (2)and (4)

A. Lean mixes bleed more as compared to rich ones
B. Bleeding can be minimized by adding pozzuolana finer aggregate
C. Bleeding can be increased by addition ‘of calcium chloride
D. none of the above

A. Elastic modulus of high tensile steel is nearly the same as that of mild steel
B. Elastic modulus of high tensile steel is more than that of mild steel
C. Carbon percentage in high carbon steel is less than that in mild steel
D. High tensile steel is cheaper than mild steel

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