22. Pick up the incorrect statement from the following : Tensile reinforcement bars of a rectangular beam

A. are curtailed if not required to resist the bending moment

B. are bent up at suitable places to serve as shear reinforcement

C. are bent down at suitable places to serve as shear reinforeNment

D. are maintained at bottom to provide at least local bond stress.

23. If diameter of a reinforcement bar is d, the anchorge value of the hook is

A. 4d

B. 8d

C. 12d

D. 16d

24. The radius of a bar bend to form a hook, should not be less than

A. twice the diameter

B. thrice the diameter

C. four times the diameter

D. five times the diameter

25. The length of the straight portion of a bar beyond the end of the hook, should be at least

A. twice the diameter

B. thrice the diameter

C. four times the diameter

D. seven times the diameter.

26. The anchorage value of a hook is assumed sixteen times the diameter of the bar if the angle of the bend, is

A. 30?

B. 40?

C. 45?

D. all the above.

27. The stresses developed in concrete and steel in reinforced concrete beam 25 cm width and 70, cm effective depth, are 62.5 kg/cm2 and 250 kg/cm2 respectively. If m = 15, the depth of its neutral axis is

A. 20 cm

B. 25 cm

C. 30 cm

D. 35 cm

28. A singly reinforced concrete beam of 25 cm width and 70 cm effective depth is provided with 18.75 cm2 steel. If the modular ratio (m) is 15, the depth of the neutral axis, is

A. 20 cm

B. 25 cm

C. 30 cm

D. 35 cm

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