RCC Structures Design MCQ

Test your knowledge with important RCC Structures Design MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more RCC Structures Design MCQs at Bissoy

• If the depth of actual neutral axis of a doubly reinforced beam
  ক

  Is greater than the depth of critical neutral axis, the concrete attains its maximum stress earlier

  খ

  Is less than the depth of critical neutral axis, the steel in the tensile zone attains its maximum stress earlier

  গ

  Is equal to the depth of critical neutral axis; the concrete and steel attain their maximum stresses simultaneously

  ঘ

  All the above
• In a singly reinforced beam
  ক

  Compression is borne entirely by concrete

  খ

  Steel possesses initial stresses when embedded in concrete

  গ

  Plane sections transverse to the centre line of the beam before bending remain plane after bending

  ঘ

  Elastic moduli for concrete and steel have different values within the limits of deformation of the beam
• Pick up the incorrect statement from the following. The intensity of horizontal shear stress at the elemental part of a beam section, is directly proportional to
  ক

  Shear force

  খ

  Area of the section

  গ

  Distance of the C.G. of the area from its neutral axis

  ঘ

  Moment of the beam section about its neutral axis
• The maximum ratio of span to depth of a slab simply supported and spanning in two directions, is
  ক

  25

  খ

  30

  গ

  35

  ঘ

  40
• In case the factor of safety against sliding is less than 1.5, a portion of slab is constructed downwards at the end of the heel slab, which is known as
  ক

  A key

  খ

  A cut-off wall

  গ

  A rib

  ঘ

  All the above
• For stairs spanning horizontally, the minimum waist provided is
  ক

  4 cm

  খ

  6 cm

  গ

  8 cm

  ঘ

  12 cm
• Piles are usually driven by
  ক

  Diesel operated hammer

  খ

  Drop hammer

  গ

  Single acting steam hammer

  ঘ

  All the above
• In a combined footing if shear stress exceeds 5 kg/cm², the nominal stirrups provided are:
  ক

  6 legged

  খ

  8 legged

  গ

  10 legged

  ঘ

  12 legged
• The effective span of a simply supported slab, is
  ক

  Distance between the centers of the bearings

  খ

  Clear distance between the inner faces of the walls plus twice the thickness of the wall

  গ

  Clear span plus effective depth of the slab

  ঘ

  None of these
• A foundation rests on
  ক

  Base of the foundation

  খ

  Sub-grade

  গ

  Foundation soil

  ঘ

  Both B and C
• If the length of a wall on either side of a lintel opening is at least half of its effective span L, the load W carried by the lintel is equivalent to the weight of brickwork contained in an equilateral triangle, producing a maximum bending moment
  ক

  $$\frac{{{\text{WL}}}}{2}$$

  খ

  $$\frac{{{\text{WL}}}}{4}$$

  গ

  $$\frac{{{\text{WL}}}}{6}$$

  ঘ

  $$\frac{{{\text{WL}}}}{8}$$
• If diameter of a reinforcement bar is d, the anchorage value of the hook is
  ক

  4d

  খ

  8d

  গ

  12d

  ঘ

  16d
• A very comfortable type of stairs is
  ক

  Straight

  খ

  Dog legged

  গ

  Geometrical

  ঘ

  Open newel
• If the ratio of the span to the overall depth does not exceed 10, the stiffness of the beam will ordinarily be satisfactory in case of a
  ক

  Simply supported beam

  খ

  Continuous beam

  গ

  Cantilever beam

  ঘ

  None of these
• With usual notations the depth of the neutral axis of a balanced section, is given by
  ক

  $$\frac{{{\text{mc}}}}{{\text{t}}} = \frac{{{\text{d}} - {\text{n}}}}{{\text{n}}}$$

  খ

  $$\frac{{\text{t}}}{{{\text{mc}}}} = \frac{{\text{n}}}{{{\text{d}} - {\text{n}}}}$$

  গ

  $$\frac{{\text{t}}}{{{\text{mc}}}} = \frac{{{\text{d}} + {\text{n}}}}{{\text{n}}}$$

  ঘ

  $$\frac{{{\text{mc}}}}{{\text{t}}} = \frac{{\text{n}}}{{{\text{d}} - {\text{n}}}}$$
• For a number of columns constructed in a rcjw, the type of foundation provided, is
  ক

  Footing

  খ

  Raft

  গ

  Strap

  ঘ

  Strip
• In a cantilever retaining wall without a heel slab
  ক

  Thickness of the stem is kept same throughout

  খ

  Base slab is made 10 cm thicker than the stem

  গ

  Width of the base slab is kept 0.7 time the total height of the wall

  ঘ

  All the above
• On an absolutely rigid foundation base, the pressure will
  ক

  Be more at the edges of the foundation

  খ

  Be uniform

  গ

  Not be uniform

  ঘ

  Be zero at the centre of the foundation
• An R.C.C. beam not provided with shear reinforcement may develop cracks in its bottom inclined roughly to the horizontal at
  ক

  25°

  খ

  35°

  গ

  45°

  ঘ

  55°
• Post tensioning system
  ক

  Was widely used in earlier days

  খ

  Is not economical and hence not generally used

  গ

  Is economical for large spans and is adopted now a days

  ঘ

  None of these
• A simply supported beam 6 m long and of effective depth 50 cm, carries a uniformly distributed load 2400 kg/m including its self weight. If the lever arm factor is 0.85 and permissible tensile stress of steel is 1400 kg/cm², the area of steel required, is
  ক

  14 cm²

  খ

  15 cm²

  গ

  16 cm²

  ঘ

  17 cm²
• Spacing of stirrups in a rectangular beam, is
  ক

  Kept constant throughout the length

  খ

  Decreased towards the centre of the beam

  গ

  Increased at the ends

  ঘ

  Increased at the centre of the beam
• 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
  ক

  10 mm

  খ

  15 mm

  গ

  20 mm

  ঘ

  25 mm
• If S_b, is the average bond stress on a bar of diameter d subjected to maximum stress t, the length of the embedment $$l$$ is given by
  ক

  $$l = \frac{{{\text{dt}}}}{{{{\text{S}}_{\text{b}}}}}$$

  খ

  $$l = \frac{{{\text{dt}}}}{{2{{\text{S}}_{\text{b}}}}}$$

  গ

  $$l = \frac{{{\text{dt}}}}{{3{{\text{S}}_{\text{b}}}}}$$

  ঘ

  $$l = \frac{{{\text{dt}}}}{{4{{\text{S}}_{\text{b}}}}}$$
• A flat slab is supported
  ক

  On beams

  খ

  On columns

  গ

  On beams and columns

  ঘ

  On columns monolithically built with slab
• A short column 20 cm × 20 cm in section is reinforced with 4 bars whose area of cross section is 20 sq. cm. If permissible compressive stresses in concrete and steel are 40 kg/cm² and 300 kg/cm², the Safe load on the column, should not exceed
  ক

  4,120 kg

  খ

  41,200 kg

  গ

  4,12,000 kg

  ঘ

  None of these
• 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
  ক

  10 mm

  খ

  15 mm

  গ

  20 mm

  ঘ

  25 mm
• By over-reinforcing a beam, the moment of resistance can be increased not more than
  ক

  10%

  খ

  15%

  গ

  20%

  ঘ

  25%
• In a combined footing if shear stress does not exceed 5 kg/cm², the nominal stirrups provided are
  ক

  6 legged

  খ

  8 legged

  গ

  10 legged

  ঘ

  12 legged
• The shear reinforcement in R.C.C. is provided to resist
  ক

  Vertical shear

  খ

  Horizontal shear

  গ

  Diagonal compression

  ঘ

  Diagonal tension