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This set of RCC Structures Design Multiple Choice Questions & Answers (MCQs) focuses on Rcc Structures Design Set 5
Q1 | If the shear stress in a R.C.C. beam is
- Equal or less than 5 kg/cm2, no shear reinforcement isprovided
- Greater than 4 kg/cm2, but less than 20 kg/cm2, shear reinforcement is provided
- Greater than 20 kg/cm2, the size of the section ischanged
- All the above
Q2 | For a continuous floor slab supported on beams, the ratio of end span length and intermediate span length, is
- 0.6
- 0.7
- 0.8
- 0.9
Q3 | In a singly reinforced beam
- Compression is borne entirely by concrete
- Steel possesses initial stresses when embedded in concrete
- Plane sectionstransverse to the centre line ofthe beam before bending remain plane after bending
- Elasticmoduli for concrete and steel have different values within the limits of deformation of the beam
Q4 | The ratio of the breadth to effective depth of a beam is kept
- 0.25
- 0.5
- 0.7
- 0.75
Q5 | In a cantilever retaining wall without a heel slab
- Thickness ofthe stem is keptsame throughout
- Base slab is made 10 cm thicker than the stem
- Width of the base slab is kept 0.7 time the total height of the wall
- All the above
Q6 | is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The maximum stress in the beam, subjected to a maximum bending moment , is
- f = (P/A) +(Z/M)
- f = (A/P) +(M/Z)
- f = (P/A) + (M/Z)
- f = (P/A) + (M/6Z)
Q7 | A T-beam behaves as a rectangular beam of a width equal to its flange if its neutral axis
- Remains within the flange
- Remains below the slab
- Coincides the geometrical centre of thebeam
- None of these
Q8 | For the design of a simply supported T-beam the ratio of the effective span to the overall depth of the beam is limited to
- 10
- 15
- 20
- 25
Q9 | A reinforced concrete cantilever beam is 3.6 m long, 25 cm wide and has its lever arm 40 cm. It carries a load of 1200 kg at its free end and vertical stirrups can carry 1800 kg. Assuming concrete to carry one-third of the diagonal tension and ignoring the weight of the beam, the number of shear stirrups required, is
- 30
- 35
- 40
- 45
Q10 | The width of the rib of a T-beam, is generally kept between
- 1/7 to 1/3 of rib depth
- 1/3 to 1/2 of rib depth
- 1/2 to 3/4 of rib depth
- 1/3 to 2/3 of rib depth
Q11 | A ribbed slab is provided for
- A plain ceiling
- Thermalinsulation
- Acousticinsulation
- All the above
Q12 | To ensure that the hogging bending moment at two points of suspension of a pile of length L equals the sagging moment at its centre, the distances of the points of suspension from either end, is
- 0.107 L
- 0.207 L
- 0.307 L
- 0.407L
Q13 | The stresses developed in concrete and steel in reinforced concrete beam 25 cm width and 70 cm effective depth, are 62.5 kg/cm2 and 250 kg/cm2 respectively. If m = 15, the depth of its neutral axis is
- 20 cm
- 25 cm
- 30 cm
- 35 cm
Q14 | If the depth of actual neutral axis of a doubly reinforced beam
- Is greaterthan the depth of critical neutral axis, the concrete attainsits maximum stress earlier
- Islessthan the depth of critical neutral axis, the steel in the tensile zone attainsits maximum stress earlier
- Is equal to the depth of critical neutral axis; the concrete and steel attain their maximum stresses simultaneously
- All the above
Q15 | If the modularratio is , steel ratio is and overalldepth of a beam is , the depth ofthe critical neutral axis of the beam, is
- [m/(m - r)] d
- [m/(m + r)] d
- [(m + r)/m] d
- [(r - m)/m] d
Q16 | The maximum diameter of a bar used in a ribbed slab, is
- 12 mm
- 6 mm
- 20 mm
- 22 mm
Q17 | A column is regarded as long column if the ratio of its effective length and lateral dimension, exceeds
- 10
- 15
- 20
- 25
Q18 | According to the steel beam theory of doubly reinforced beams
- Tension is resisted by tension steel
- Compression is resisted by compression steel
- Stress in tension steel equals the stress in compressionsteel
- All the above
Q19 | The breadth of a ribbed slab containing two bars must be between
- 6 cm to 7.5 cm
- 8 cm to 10 cm
- 10 cm to 12 cm
- 12 cm to 15 cm
Q20 | The stem of a cantilever retaining wall which retains earth level with top is 6 m. If the angle of repose and weight of the soil per cubic metre are 30° and 2000 kg respectively, the effective width of the stem at the bottom, is
- 51.5
- 52.5
- 53.5
- 54.5
Q21 | If the diameter of the main reinforcement in a slab is 16 mm, the concrete cover tomain bars is
- 10 mm
- 12 mm
- 14 mm
- 16 mm
Q22 | Minimum spacing between horizontal parallel reinforcement of different sizes, should not be less than
- One diameter ofthinner bar
- One diameter ofthicker bar
- Twice the diameter of thinner bar
- None of these
Q23 | For a number of columns constructed in a rcjw, the type of foundation provided, is
- Footing
- Raft
- Strap
- Strip
Q24 | A singly reinforced concrete beam of 25 cm width and 70 cm effective depth is provided with 18.75 cm2 steel. If the modular ratio (m) is 15, the depth of the neutral axis, is
- 20 cm
- 25 cm
- 30 cm
- 35 cm
Q25 | In testing a pile by load test, pile platform is loaded with one and half times the design load and a maximum settlement is noted. The load is gradually removed and the consequent rebound is measured. For a safe pile, the net settlement (i.e. total settlement minus rebound) per tonne of test load should not exceed
- 10 mm
- 15 mm
- 20 mm
- 25 mm