274. In over reinforced singly beam,

A. the concrete reaches its compressive strength before steel reaches its yielding stress

B. the concrete fails when it has reached strain of 0.3 to 0.4%

C. the failure occurs without visible signs

D. all of these

275. For design purposes of flexural members, the compressive strength of concrete is assumed to be

A. 0.67 times the characteristic strength

B. 0.57 times the characteristic strength

C. 0.73 times the characteristic strength

D. 0.42 times the characteristic strength

276. For the design of flexural members, the safety partial fact for compressive strength

A. rm = 1.2

B. rm = 1.4

C. rm = 1.5

D. rm = 1.25

277. The compression stress in concrete at the level of centroid of compresion steel is equal to where Fele is the characteristic strength of concrete:

A. 0.446 Fa

B. 0.416 Fck

C. 0.36 Fck

D. 0.57 Fck

278. For the design purposes of flexural members, the partial safety factor for stress in the reinforcement

A. rm = 1.5

B. rm = 1.15

C. rm = 1.25

D. I'm = 1.35

279. A double reinforced beam may be provided from structural point of view

A. structural point of view

B. architectural point of view

C. head room point of view

D. all of these

280. Pick up the incorrect statement from the following In doubly reinforced beams,

A. steel is provided both on tension and compression sides

B. the moment of resistance is the sum of limiting resistance of singly reinforced section and the additional moment given by compression steel

C. the moment of resistance is the sum of limiting resistance of singly reinforced section, the addition moment given by compression steel and extra tensile steel

D. none of these

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