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

Pick up the correct statement for the web stiffeners?

A. d is the distance between flange angles or the clear distance between flanges
B. vertical stiffeners are spaced at a distance not greater than 1.5 d and not less than 0.33 d
C. for horizontal stiffeners, d is the clear distance between the horizontal stiffener and the tension flange
D. all the above

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