Rcc Structures Design Set 2

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This set of RCC Structures Design Multiple Choice Questions & Answers (MCQs) focuses on Rcc Structures Design Set 2

Q1 | The minimum thickness of the cover at the end of a reinforcing bar should not be less than twice the diameter of the bar subject to a minimum of
  • 10 mm
  • 15 mm
  • 20 mm
  • 25 mm
Q2 | Top bars are extended to the projecting parts of the combined footing of two columns Ldistance apart for a distance of
  • 0.1 L from the outer edge of column
  • 0.1 L from the centre edge of column
  • Half the distance of projection
  • One-fourth the distance of projection
Q3 | For M 150 grade concrete (1:2:4) the moment of resistance factor is
  • 0.87
  • 8.5
  • 7.5
  • 5.8
Q4 | is the pre-stressed force applied to tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is. The minimum stress on 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)
Q5 | If C is creep coefficient, f is original pre-stress in concrete, m is modular ratio, E is Young's modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is:
  • (1 - C)mf - eE
  • (C - 1)mf + eE
  • (C - 1)mf - eE
  • (1 - C)mf + eE
Q6 | In a pre-stressed member it is advisable to use
  • Low strength concrete only
  • High strength concrete only
  • Low strength concrete but high tensile steel
  • High strength concrete and high tensile steel
Q7 | An R.C.C. lintel is spanning an opening of 2 m span in a brick wall. The height of the roof is 2.9 m above the floor level and that of the opening is 2.1 m above the floor level. The lintel is to be designed for self weight plus
  • Triangular load of the wall
  • UDL of wall
  • UDL of wall + load from the roof
  • Triangular load + load from the roof
Q8 | The minimum clear cover for R.C.C. columns shall be
  • Greater of 40 mm or diameter
  • Smaller of 40 mm or diameter
  • Greater of 25 mm or diameter
  • Smaller of 25 mm or diameter
Q9 | The minimum thickness of a flat slab is taken
  • L/32 for end panels without drops
  • L/36 for end panels without drops
  • L/36 for interior panels without drop
  • All the above
Q10 | The design of heel slab of a retaining wall is based on the maximum bending moment due to:
  • Its own weight
  • Weight of the soil above it
  • Load of the surcharge, if any
  • All the above
Q11 | An R.C.C beam of 25 cm width has a clear span of 5 metres and carries a U.D.L. of 2000kg/m inclusive of its self weight. If the lever arm of the section is 45 cm., the beam is
  • Safe in shear
  • Is safe with stirrups
  • Is safe with stirrups and inclinedmembers
  • Needsrevision ofthe section
Q12 | The neutral axis of a T-beam exists
  • Within the flange
  • At the bottom edge of the slab
  • Below the slab
  • All the above
Q13 | A pre-cast pile generally used, is
  • Circular
  • Square
  • Octagonal
  • Square with corners chamfered
Q14 | The spacing of transverse reinforcement of column is decided by the following consideration.
  • The least lateral dimension of the column
  • Sixteen timesthe diameter of the smallest longitudinal reinforcing rods in the column
  • Forty-eight times the diameter of transverse reinforcement
  • All the above
Q15 | The self-weight of the footing, is
  • Not considered for calculating the upward pressure onfooting
  • Also considered for calculating the upward pressure onfooting
  • Not considered for calculating the area of the footing
  • Both (b) and(c)
Q16 | Pick up the incorrect statement from the following:
  • In the stem of a retaining wall, reinforcement is provided near the earth side
  • In the toe slab of a retaining wall, reinforcement is provided at the bottom of the slab
  • In the heel slab of a retaining wall, reinforcement is provided at the top of the slab
  • None of these
Q17 | If the bearing capacity of soil is 10 tonnes/cm2 and the projection of plain concrete footing from walls, is a cm, the depth D of footing is
  • D = 0.0775 a
  • D = 0.775 a
  • D = 0.775 a
  • D = 0.775 a2
Q18 | After pre-stressing process is completed, a loss of stress is due to
  • Shrinkage of concrete
  • Elastic shortening of concrete
  • Creep of concrete
  • All the above
Q19 | In a simply supported slab, alternate bars are curtailed at
  • 1/4th of thespan
  • 1/5th of thespan
  • 1/6th of thespan
  • 1/7th of thespan
Q20 | If R and T are rise and tread of a stair spanning horizontally, the steps are supported by a wall on one side and by a stringer beam on the other side, the steps are designed as beams of width
  • R + T
  • T - R
  • 2 +T2)
  • R - T
Q21 | If p1 and P2 are effective lateral loadings at the bottom and top exerted by a level earth subjected to a super-load on the vertical face of height h of a retaining wall, the horizontal pressure p per unit length of the wall, is
  • [( - )/2] h
  • [( + )/4] h
  • [( + )/2] h
  • ( - h
Q22 | In the zone of R.C.C. beam where shear stress is less than 5 kg/cm2 , nominal reinforcement is provided at a pitch of
  • One-half lever arm of the section
  • One-third lever arm of the section
  • Lever arm of the section
  • One and half lever arm of the section
Q23 | The transverse reinforcements provided at right angles to the main reinforcement
  • Distribute the load
  • Resist the temperature stresses
  • Resist the shrinkage stress
  • All the above
Q24 | Long and short spans of a two way slab are ly and lx and load on the slab acting on strips parallel to lx and ly be wx and wy respectively. According to Rankine Grashoff theory
  • (wx/wy) = (ly/lx)
  • (wx/wy) = (ly/lx)²
  • (wx/wy) = (ly/lx)4
  • None of these
Q25 | The pitch of the main bars in a simply supported slab, should not exceed its effective depth by
  • Three times
  • Four times
  • Five times
  • Six times