RCC STRUCTURES DESIGN QUIZ

If A is the area of the foundation of a retaining wall carrying a load W and retaining earth of weight 'w' per unit volume, the minimum depth (h) of the foundation from the free surface of the earth, is

h = (W/Aw) [(1 - sin φ)/(1 + sin φ)]

h = √(W/Aw) [(1 - sin φ)/(1 + sin φ)]²

h = (W/Aw) [(1 - sin φ)/(1 + sin φ)]²

h = (W/Aw) [(1 + sin φ)/(1 + sin φ)]

TRUE ANSWER : ?
YOUR ANSWER : ?

If the modular ratio is ‘m’, steel ratio is ‘r’ and overall depth of a beam is ‘d’, the depth of the critical neutral axis of the beam, is

[m/(m - r)] d

[(m + r)/m] d

[m/(m + r)] d

[(r - m)/m] d

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YOUR ANSWER : ?

The minimum cube strength of concrete used for a pre-stressed member, is

150 kg/cm²

250 kg/cm²

350 kg/cm²

50 kg/cm²

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YOUR ANSWER : ?

The length of the lap in a compression member is kept greater than bar diameter x (Permissible stress in bar / Five times the bond stress) or

18 bar diameters

12 bar diameters

30 bar diameters

24 bar diameters

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If q is the punching shear resistance per unit area a, is the side of a square footing for a column of side b, carrying a weight W including the weight of the footing, the depth (D) of the footing from punching shear consideration, is

D = W (a - b)/4a²bq

D = W (a² - b²)/4abq

D = W (a² - b²)/8a²bq

D = W (a² - b²)/4a²bq

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YOUR ANSWER : ?

If K is a constant depending upon the ratio of the width of the slab to its effective span l, x is the distance of the concentrated load from the nearer support, bw is the width of the area of contact of the concentrated load measured parallel to the supported edge, the effective width of the slab be is

Kx (1 + x/l) + bw

All listed here

Kx (1 - x/l) + bw

K/x (1 + x/d) + bw

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YOUR ANSWER : ?

As per I.S. 456 - 1978, the pH value of water shall be

Equal to 7

Equal to 6

Not less than 6

Less than 6

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An R.C.C 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

Safe in shear

Needs revision of the section

Is safe with stirrups

Is safe with stirrups and inclined members

TRUE ANSWER : ?
YOUR ANSWER : ?

If ‘W’ is the uniformly distributed load on a circular slab of radius ‘R’ fixed at its ends, the maximum positive radial moment at its centre, is

2WR²/16

WR²/16

3WR²/16

None of these

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YOUR ANSWER : ?

If the length of an intermediate span of a continuous slab is 5 m, the length of the end span is kept

4.1 m

4.0 m

4.5 m

4.7 m

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YOUR ANSWER : ?

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