183. An R.C.C. beam not provided with shear reinforcement may develop cracks in its bottom inclined roughly to the horizontal at

A. 55 ?

B. 35?

C.45?

D. 55?

184. If the shear stress in a R.C.C. beam is

A. equal or less than 5 kg/cm2, no shear reinforcement is provided

B. greater than 4 kg/cm2, but less than 20 kg/cm2, shear reinforcement is provided

C. greater than 20 kg/cm2, the size of the section is changed

D. all the above.

185. The shear reinforcement in R.C.C. is provided to resist

A. vertical shear

B. horizontal shear

C. diagonal compression

D. diagonal tension.

186. If the maximum shear stress at the end of a simply supported R.C.C. beam of 6 m effective span is 10 kg/cm2, the share stirrups are provided for a distance x from either end where x is

A. 50 cm

B. 100 cm

C. 150 cm

D. 200 cm.

187. In the zone of R.C.C. beam where shear stress is less than 5 kg/cm2, nominal reinforcement is provided at a pitch of

A. one-half lever arm of the section

B. one-third lever arm of the section

C. lever arm of the section

D. one and half lever arm of the section.

188. If the maximum shear stress at the end of a simply supported R.C.C. beam of 16 m effective span is 10 kg/cm2, the length of the beam having nominal reinforcement, is

A. 4 cm

B. 6 m

C. 8 m

D. 10 m.

189. The load stress of a section can be reduced by

A. decreasing the lever arm

B. increasing the total perimeter of bars

C. replacing larger bars by greater number of small bars

D. replacing smaller bars by greater number of greater bars

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