Pick up the correct statement from the following?
A. For steel castings, the minimum tensile strength is 41 kg/mm2 and minimum yield stress is 20.5 kg/mm2
B. For high tensile steel, the minimum tensile strength is 58 kg/mm2
C. For mild steel the minimum tensile strength is 44 kg/mm2 and minimum elongation of 23% on a gauge length of 5.65A
D. All the above
Removal of props under______________?
A. slabs spanning upto 4.5 m is 14 days
B. beams spanning upto 6 m is 14 days
C. slabs spanning upto 4.5 m is 7 days
D. All the above
All reinforcement should be free from_________________?
A. paints
B. loose rust
C. loose mill scales
D. All the above
The permissible bending stresses Pbet for steel slab bases should not exceed_______________?
A. 1500 kg/cm2
B. 1650 kg/cm2
C. 1800 kg/cm2
D. 1890 kg/cm2
A. 4 d
B. 8d
C. 12 d
D. 16 d