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This set of RCC Structures Design Multiple Choice Questions & Answers (MCQs) focuses on Rcc Structures Design Set 4
Q1 | The zone in which transverse bending is likely to occur may be obtained by drawing aline from the
- 30°
- 45°
- 60°
- None of these
Q2 | The thickness of the topping of a ribbed slab, varies between
- 3 cm to 5 cm
- 5 cm to 8 cm
- 8 cm to 10 cm
- 12 cm to 15 cm
Q3 | If the length of an intermediate span of a continuous slab is 5m, the length of the endspan is kept
- 4.5 m
- 4.0 m
- 3.5 m
- 3.0 m
Q4 | If L is the effective span of a R.C.C. beam which is subjected to maximum shear qmax at the ends, the distance from either end over which stirrups for the shear, are provided, is
- (L/2) (1 - 3/qmax)
- (L/3) (1 - 5/qmax)
- (L/2) (1 - 5/qmax)
- (L/2) (1 - 2/qmax)
Q5 | The angle of internal friction of soil mass is the angle whose
- Tangent is equal to the rate of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on theplane
- Sine is equal to the ratio ofthe maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane
- Cosine is equal to the ratio of themaximum resistance sliding on any internal inclined plane to the normal pressure acting on the plane
- None of these
Q6 | The maximum ratio of span to depth of a slab simply supported and spanning in twodirections, is
- 25
- 30
- 35
- 40
Q7 | If T and R are the tread and rise of a stair which carries a load w per square metre on slope, the corresponding load per square metre of the horizontal area, is
- w (R + T)/T
- w (R² + T²)/T
- w (R + T)/T
- w (R/T)
Q8 | If the loading on a pre-stressed rectangular beam, is uniformly distributed, the tendonto be provided should be.
- Straight below centroidal axis
- Parabolic with convexity downward
- Parabolic with convexity upward
- Straight above centroidal axis
Q9 | For normal cases, stiffness of a simply supported beam is satisfied if the ratio of itsspan to its overall depth does not exceed
- 10
- 15
- 20
- 25
Q10 | If the maximum dip of a parabolic tendon carrying tension P is h and the effective length of the pre-stressed beam is L, the upward uniform pressure will be
- 8hp/l
- 8hp/l²
- 8hl/p
- 8hl/p²
Q11 | 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
- 200 cm
- 300 cm
- 150 cm
- 100 cm
Q12 | The steel generally used in R.C.C. work, is
- Stainless
- Mild steel
- High carbon steel
- High tensionsteel
Q13 | If the ratio of long and short spans of a two way slab with corners held down is r, the actual reduction of B.M. is given by
- (5/6) (r/1 + r²) M
- (5/6) (r²/1 + r²)M
- (5/6) (r²/1 + r3)M
- (5/6) (r²/1 + r4) M
Q14 | A part of the slab may be considered as the flange of the T-beam if
- Flange has adequate reinforcement transverse tobeam
- It is built integrally with the beam
- It is effectively bonded together with the beam
- All the above
Q15 | By over-reinforcing a beam, the moment of resistance can be increased not more than
- 10%
- 15%
- 20%
- 25%
Q16 | Total pressure on the vertical face of a retaining wall of height per unit run exerted by the retained earth weighing per unit volume, is
- wh [(1 - )/(1 + sin )]
- wh² [(1 - )/(1 + sin )]
- wh² [(1 - )/2(1 + sin )]
- wh²[(1 - )/3(1 + sin )]
Q17 | A singly reinforced beam has breadth b, effective depth d, depth of neutral axis n and critical neutral axis n1. If fc and ft are permissible compressive and tensile stresses, the moment to resistance of the beam, is
- bn (fc/2) (d - n/3)
- Atft (d - n/3)
- ½ n1 (1 - n1/3) cbd²
- All the above
Q18 | According to I.S.: 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than
- 5 cm
- 10 cm
- 15 cm
- 20 cm
Q19 | If l1 and l2 are the lengths of long and short spans of a two way slab simply supported on four edges and carrying a load w per unit area, the ratio of the loads split into w1 and w2acting on strips parallel to l2 and l1 is
- w1/w2 = l2/l1
- w1/w2 = (l2/l1)²
- w1/w2 = (l2/l1)3
- w1/w2 = (l2/l1)4
Q20 | The live load to be considered for an accessible roof, is
- Nil
- 75 kg/m3
- 150 kg/m2
- 200 kg/cm2
Q21 | If Ac, Asc and A are areas of concrete, longitudinal steel and section of a R.C.C. column and m and c are the modular ratio and maximum stress in the configuration of concrete, the strength of column is
- cAc + m cAsc
- c(A - Asc) + m cAsc
- c[A + (m - 1)ASC]
- All the above
Q22 | On an absolutely rigid foundation base, the pressure will
- Be more at the edges of thefoundation
- Be uniform
- Not be uniform
- Be zero at the centre of the foundation
Q23 | The diameter of transverse reinforcement of columns should be equal to one-fourth of the diameter of the main steel rods but not less than
- 4 mm
- 5 mm
- 6 mm
- 7 mm
Q24 | If longitudinally spanning stairs are casted along with their landings, the maximum bending moment per metre width, is taken as
- wl²/4
- wl²/8
- wl²/10
- wl²/12
Q25 | If P kg/m2 is the upward pressure on the slab of a plain concrete footing whose projection on either side of the wall is a cm, the depth of foundation D is given by
- D = 0.00775 aP
- D = 0.0775 aP
- D = 0.07775 aP
- D = 0.775 Pa