1. The advantage of reinforced concrete, is due to
A. monolithic character
B. fire-resisting and durability
C. economy because of less maintenance cost
D. All the above.
2. In a singly reinforced beam
A. compression is borne entirely by concrete
B. steel possesses initial stresses when embeded in concrete
C. plane sections transverse to the centre line of the beam before bending remain plane after bending
D. elastic modulii for concrete and steel have different values within the limits of deformation of the beam
3. In a singly reinforced beam, the effective depth is measured from its compression edge to
A. tensile edge
B. tensile reinforcement
C. neutral axis of the beam
D. longitudinal central axis.
4. If the modular ratio is m, steel ratio is r and overall depth of a beam is d, the depth of the critical neutral axis of the beam, is
D. r -mm d
5. The section of a reinforced beam where most distant concrete fibre in compression and tension in steel attains permissible stressess simultaneously, is called
A. balanced section
B. economic section
C. critical section
D. all the above.
6. If the permissible compressive and tensile stresses in a singly reinforced beam are 50 kg/cni2 and 1400 kg/cm2 respectively and the modular ratio is 18, the percentage area At of the steel required for an economic section, is
7. In a singly reinforced beam, if the permissible stress in concrete reaches earlier than that in steel, the beam section is called
A. under-reinforced section
B. over reinforced section
C. economic section
D. critical section.
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