Answer Posted / naveen k. singh

when moment of resistant of a section is gteater than the
design moment then section is designed for under reinforced
section/beam.
when moment of resistant of a section is less than the
design moment then section is designed for over reinforced
section/beam.
OR
when Ast of a section is greater than Ast for balanced
section then section is called OVER REINFORCED section.

when Ast of a section is less than Ast for balanced section
then section is called UNDER REINFORCED section.

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