176. If depth of slab is 10 cm, width of web 30 cm, depth of web 50 cm, centre to centre distance of beams 3 m, effective span of beams 6 m, the effective flange width of the beam, is

A. 200 cm

B. 300 cm

C. 150 cm

D. 100 cm.

177. An under-reinforced section means

A. Steel is provided at the under side only

B. Steel provided is insufficient

C. Steel provided on one face only

D. Steel will yield first.

178. An R.C.C. beam of 6 m span is 30 cm wide and has a lever arm of 55 cm. If it carries a U.D.L. of 12 t per m and allowable shear stress is 5 kg/cm2, the beam

A. is safe in shear

B. is safe with stirrups

C. is safe with stirrups and inclined bars

D. needs revision of section.

179. An R.C.C. column of 30 cm diameter is reinforced with 6 bars 12 mm 0 placed symmetrically along the circumference. If it carries a load of 40,000 kg axially, the stress is

A. 49.9 kg/cm2

B. 100 kg/cm2

C. 250 kg/cm2

D. 175 kg/cm2.

180. An R.C.C. beam of 25 cm width and 50 cm effective depth has a clear span of 6 metres and carries a U1IL.-of 3000 kg/m inclusive of its self weight. If the lever arm constant for the section is 0.865, the maximum intensity of shear stress, is

A. 8.3 kg/cm2

B. 7.6 kg/cm2

C. 21.5 kg/cm2

D. 11.4 kg/cm2.

181. An R.C.0 beam of 25 cm width has a clear span of 5 metres and carries a U.D.L. of 2000 kg/m inclusive of its self weight. If the lever arm of the section is 45 cm., the beam is

A. safe in shear

B. is safe with stirrups

C. is safe with stirrups and inclined members

D. needs revision of the section.

182. If permissible working stresses in steel and concrete are respectively 1400 kg/cm2 and 80 kg/cm2 and modular ratio is 18, in a beam reinforced in tension side and of width 30 cm and having effective depth 46 cm, the lever arms of the section, is

A. 37 cm

B. 38 cm.

C. 39 cm

D.

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