RCC Structures Design
In a pre-stressed member it is advisable to use

Low strength concrete but high tensile steel
High strength concrete only
Low strength concrete only
High strength concrete and high tensile steel

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RCC Structures Design
If the depth of actual neutral axis of a doubly reinforced beam

Is less than the depth of critical neutral axis, the steel in the tensile zone attains its maximum stress earlier
All listed here
Is equal to the depth of critical neutral axis; the concrete and steel attain their maximum stresses simultaneously
Is greater than the depth of critical neutral axis, the concrete attains its maximum stress earlier

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