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Q: The maximum diameter of a bar used in a ribbed slab is
  • A. 12 mm
  • B. 6 mm
  • C. 20 mm
  • D. 22 mm
Correct Answer: Option D - Ribbed slab system is a special type of grid floor slab beam system, in which slab, called topping is very thin (50–100mm) and beams called ribs are very slender and closely spaced. ■ The ribs have a thickness of not less than 85mm an a depth that is three or four times of thickness. ■ The maximum diameter of bar used in a ribbed slab is 22 mm.
D. Ribbed slab system is a special type of grid floor slab beam system, in which slab, called topping is very thin (50–100mm) and beams called ribs are very slender and closely spaced. ■ The ribs have a thickness of not less than 85mm an a depth that is three or four times of thickness. ■ The maximum diameter of bar used in a ribbed slab is 22 mm.

Explanations:

Ribbed slab system is a special type of grid floor slab beam system, in which slab, called topping is very thin (50–100mm) and beams called ribs are very slender and closely spaced. ■ The ribs have a thickness of not less than 85mm an a depth that is three or four times of thickness. ■ The maximum diameter of bar used in a ribbed slab is 22 mm.