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Q: The thickness of the topping of a ribbed slab, varies between :
  • A. 3 cm to 5 cm
  • B. 5 cm to 8 cm
  • C. 8 cm to 10 cm
  • D. 12 cm to 15 cm
Correct Answer: Option B - Ribbed slab system–It is a special type of 'grid flour' slab-beam system, in which the slab, called 'topping' is very thin (50mm to 100mm) and the beam, called 'rib' are very slender & closely spaced (less than 1.5m a part) The rib have thickness not less then 65mm. A two-way ribber slab system is known as waffle slab.
B. Ribbed slab system–It is a special type of 'grid flour' slab-beam system, in which the slab, called 'topping' is very thin (50mm to 100mm) and the beam, called 'rib' are very slender & closely spaced (less than 1.5m a part) The rib have thickness not less then 65mm. A two-way ribber slab system is known as waffle slab.

Explanations:

Ribbed slab system–It is a special type of 'grid flour' slab-beam system, in which the slab, called 'topping' is very thin (50mm to 100mm) and the beam, called 'rib' are very slender & closely spaced (less than 1.5m a part) The rib have thickness not less then 65mm. A two-way ribber slab system is known as waffle slab.