For the following questions answer them individually
The section in which concrete is not fully stressed to its permissible value when stress in steel reaches its maximum value, is called
The effective depth of a singly reinforced rectangular beam is 400 mm. The section is over reinforced and the neutral axis is 180 mm below the top. If the maximum stress attained by concrete is 5 $$\frac{N}{mm^{2}}$$ and the modular ratio is 18, then the stress developed in the steel will be
If the bond stress developed in a reinforced concrete beam is more than permissible value, it can be brought down by
A reinforced concrete slab is 75 mm thick. The maximum size of reinforcement bar that can be used is