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Q: The maximum permissible size of aggregates to be used in casting the ribs of a slab is
  • A. 5mm
  • B. 7.5mm
  • C. 10mm
  • D. 15mm
Correct Answer: Option C - Ribbed slab system:This is the special type of 'grid floor' slab-beam system in which 'slab' is called topping is very thin. And 'beams' called 'ribs' are very slender & closely spaced. The ribs have thickness of about 65mm. For casting of there ribs the maximum permissible size of aggregate is 10mm.
C. Ribbed slab system:This is the special type of 'grid floor' slab-beam system in which 'slab' is called topping is very thin. And 'beams' called 'ribs' are very slender & closely spaced. The ribs have thickness of about 65mm. For casting of there ribs the maximum permissible size of aggregate is 10mm.

Explanations:

Ribbed slab system:This is the special type of 'grid floor' slab-beam system in which 'slab' is called topping is very thin. And 'beams' called 'ribs' are very slender & closely spaced. The ribs have thickness of about 65mm. For casting of there ribs the maximum permissible size of aggregate is 10mm.