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RCC Structures Design MCQ

1.If ‘W’ is the load on a circular slab of radius ‘R’, the maximum radial moment at the centre of the slab, is

  • AWR²/16
  • B2WR²/16
  • C3WR²/16
  • D5WR²/16
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Correct Answer : (C)

3WR²/16
Explanation:

2.The anchorage value of a hook is assumed sixteen times the diameter of the bar if the angle of the bend, is

  • A30°
  • B40°
  • C45°
  • DAll the above
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Correct Answer : (D)

All the above
Explanation:

3.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

  • Abn (fc/2) (d - n/3)
  • BAt ft (d - n/3)
  • C½ n₁ (1 - n₁/3) cbd²
  • DAll the above
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Correct Answer : (D)

All the above
Explanation:

4.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

  • A(wx/wy) = (ly/lx)
  • B(wx/wy) = (ly/lx)²
  • C(wx/wy) = (ly/lx)⁴
  • DNone of these
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Correct Answer : (C)

(wx/wy) = (ly/lx)⁴
Explanation:

5.A raft foundation is provided if its area exceeds the plan area of the building by

  • A10 %
  • B20 %
  • C40 %
  • D50 %
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Correct Answer : (D)

50 %
Explanation:

6.As the percentage of steel increases

  • ADepth of neutral axis decreases
  • BDepth of neutral axis increases
  • CLever arm increases
  • DLever arm decreases
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Correct Answer : (B)

Depth of neutral axis increases
Explanation:

7.The length of lap in tension reinforcement should not be less than the bar diameter × (actual tension / four times the permissible average bond stress) if it is more than

  • A18 bar diameters
  • B24 bar diameters
  • C30 bar diameters
  • D36 bar diameters
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Correct Answer : (C)

30 bar diameters
Explanation:

8.The neutral axis of a T-beam exists

  • AWithin the flange
  • BAt the bottom edge of the slab
  • CBelow the slab
  • DAll the above
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Correct Answer : (D)

All the above
Explanation:

9.The effective width of a column strip of a flat slab, is

  • AOne-fourth the width of the panel
  • BHalf the width of the panel
  • CRadius of the column
  • DDiameter of the column
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Correct Answer : (B)

Half the width of the panel
Explanation:

10.A column is regarded as long column if the ratio of its effective length and lateral dimension, exceeds

  • A10
  • B15
  • C20
  • D25
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Correct Answer : (B)

15
Explanation:

11.The maximum permissible size of aggregates to be used in casting the ribs of a slab, is

  • A5 mm
  • B7.5 mm
  • C10 mm
  • D15 mm
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Correct Answer : (C)

10 mm
Explanation:

12.The length of the straight portion of a bar beyond the end of the hook, should be at least

  • ATwice the diameter
  • BThrice the diameter
  • CFour times the diameter
  • DSeven times the diameter
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Correct Answer : (D)

Seven times the diameter
Explanation:

13.Enlarged head of a supporting column of a flat slab is technically known as

  • ASupporting end of the column
  • BTop of the column
  • CCapital
  • DDrop panel
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Correct Answer : (C)

Capital
Explanation:

14.For a ribbed slab

  • AClear spacing between ribs shall not be greater than 4.5 cm
  • BWidth of the rib shall not be less than 7.5 cm
  • COverall depth of the slab shall not exceed four times the breadth of the rib
  • DAll the above
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Correct Answer : (D)

All the above
Explanation:

15.Top bars are extended to the projecting parts of the combined footing of two columns L distance apart for a distance of

  • A0.1 L from the outer edge of column
  • B0.1 L from the centre edge of column
  • CHalf the distance of projection
  • DOne-fourth the distance of projection
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Correct Answer : (B)

0.1 L from the centre edge of column
Explanation:

16.The pitch of the main bars in a simply supported slab, should not exceed its effective depth by

  • AThree times
  • BFour times
  • CFive times
  • DSix times
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Correct Answer : (D)

Six times
Explanation:

17.If permissible working stresses in steel and concrete are respectively 1400 kg/cm² and 80 kg/cm² and modular ratio is 18, in a beam reinforced in tension side and of width 30 cm and having effective depth 46 cm, the lever arms of the section, is

  • A37 cm
  • B38 cm
  • C39 cm
  • D40 cm
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Correct Answer : (D)

40 cm
Explanation:

18.The self-weight of the footing, is

  • ANot considered for calculating the upward pressure on footing
  • BAlso considered for calculating the upward pressure on footing
  • CNot considered for calculating the area of the footing
  • DBoth (b) and (c)
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Correct Answer : (A)

Not considered for calculating the upward pressure on footing
Explanation:

19.The diameter of the column head support a flat slab, is generally kept

  • A0.25 times the span length
  • B0.25 times the diameter of the column
  • C4.0 cm larger than the diameter of the column
  • D5.0 cm larger than the diameter of the column
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Correct Answer : (A)

0.25 times the span length
Explanation:

20.The weight of a foundation is assumed as

  • A5% of wall weight
  • B7% of wall weight
  • C10% of wall weight
  • D12% of wall weight
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Correct Answer : (C)

10% of wall weight
Explanation:

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