Civil engineer objective questions – Structural Analysis and Design (Section-13)

301. Minimum spacing between horizontal parallel reinforcements of the same size should not be less than

a ) one times diameter

b ) two times diameter

c ) three times diameter

d ) four times the diameter

302. Minimum spacing between horizontal parallel reinforcements of the different size should not be less than

a ) one times thinner bar

b ) one times thicker bar

c ) two times thinner bar

d ) two times thicker bar

303. The minimum length of the bar which must be embedded in concrete beyond any section to develop a bond is

a ) development length

b ) lap length

c ) splice length

d ) curved length

306. The lap length of a direct tension reinforcement bar in an RCC beam should be more than

a ) 30 times the diameter of the bar

b ) 48 times the diameter of the bar

c ) 24 times the diameter of the bar

d ) twice the development length or 30 times the diameter of the bar

307. The minimum straight lap length in tension bars with hooks in the R.C.C beam is

a ) 15 times the diameter of the bar or 200mm

b ) 12 times the diameter of the bar or 400mm

c ) 20 times the diameter of the bar or 400mm

d ) none of the above

308. The minimum lap length at the splice of compression reinforcement in R.C.C.

a ) 24 times the diameter of the bar or lap length

b ) 30 times the diameter of the bar or lap length

c ) 48 times the diameter of the bar or lap length

d ) 30 times the diameter of the bar or the twice the development length

309. The minimum vertical spacing of the main bars in R.C.C. beam should be

a ) diameter of the bar or maximum size of the aggregate + 5mm

b ) maximum size of the bar

c ) maximum size of the bar or 2/3 maximum size of the aggregate

d ) none of the above

310. The minimum cover to the main bars in the R.C.C. beam should be

a ) 15mm or diameter of the bar

b ) 25mm or diameter of the bar

c ) 25mm size of the aggregate

d ) 40 mm or diameter of the bar

311. The minimum thickness of the cover at the end of a reinforcing bar should be twice the diameter of the bar subjected to a minimum of

a ) 10mm

b ) 12mm

c ) 15mm

d ) 25mm

312. The main reason for providing number of reinforcing bars at a support in a simply supported beam is to resist in that zone

a ) tensile stress

b ) compressive stress

c ) shear stress

d ) bond stress

313. A doubly reinforced beam is used

a ) when extra safety factor is required

b ) when the depth and width of beam is restricted

c ) when depth of beam is more than the width

d ) a large moment of resistance is desired

314. In the analysis of doubly reinforced beam the assumption made is .

a ) tension is resisted by concrete only

b ) compression is resisted by concrete only

c ) the deformations in concrete and steel on both sides remain proportional to their distance from the neutral axis

d ) all of the above

315. In RCC , N.A means

a ) not applicable

b ) neutral axis

c ) natural axis

d ) normal axis

316. The beam section is redesigned if the shear stress exceeds the allowable shear stress by ………. times

a ) 2

b ) 4

c ) 6

d ) 8

317. In R.B. slab the permissible generally taken as compressive stress in bricks is

a ) 15kg / cm²

b ) 25kg / cm

c ) 40kg / cm²

d ) 50kg / cm²

318. Increased depth of a beam causes

a ) economy in steel

b ) economy in concrete

c ) increased stiffness of the section

d ) all of the above

319. In a rectangular R.C.C beam , the ratio of maximum shear stress to average shear stress is

a ) 1.25

b ) 1.50

c ) 1.75

d ) 2.00

320. The shear reinforcement in RCC is provided to resist

a ) vertical shear

b ) horizontal shear

c ) diagonal compression

d ) diagonal tension

321. Diagonal crack is introduced in a beam due to

a ) BM

b ) SF

c ) BM & SF

d ) none of the above

322. In a singly reinforced beam , subjected to shear force F , if d is the depth and b is the width of the section then maximum shear stress

a ) F/bxd

b ) F / ( bd² )

c ) F / ( b²d)

d ) none of the above

323. A doubly reinforced beam is economical as compared to a singly reinforced beam , because

a ) the size of the section in small

b ) the depth of the section in small

c ) compressive steel is under stressed

d ) concrete is not stressed to its full value

324. In a doubly reinforced beam the maximum shear stress occurs

a ) along the centroid

b ) along the natural axis

c ) on planes between neutral axis and the tensi le reinforcement

d ) on planes between neutral axis and the compressive reinforcement

325. If the permissible stress in steel in tension is 140N / mm² then the depth of neutral axis for a singly reinforced balanced beam will be

a ) 0.30 d

b ) 0.35 d

d ) 0.45 d

c ) 0.40 d

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