Design of Steel Structures

71. For determination of allowable stress in axial compression, Indian Standard Institution has adopted

  1. Euler's formula
  2. Rankine formula
  3. Perry Robertson formula
  4. Secant formula

Correct answer: (D)
Secant formula

72. For double angles carrying tension, placed back to back and connected to either side of the gusset plate, the sectional area of the section, is equal to cross sectional area of

  1. The section
  2. The section plus area of rivet holes
  3. The section minus area of rivet holes
  4. The section multiplied by the area of the rivet hole

Correct answer: (C)
The section minus area of rivet holes

73. For eccentrically loaded columns, the bending factor is

  1. Cross-sectional area of column/Radius of gyration
  2. Radius of gyration/Cross-sectional area of column
  3. Cross-sectional area of column/Section modulus of the section
  4. Section modulus of the section/Cross-sectional area of column

Correct answer: (C)
Cross-sectional area of column/Section modulus of the section

74. For rivets in tension with countersunk heads, the tensile value shall be

  1. Reduced by 25 %
  2. Reduced by 33.3%
  3. Increased by 25 %
  4. Increased by 33.3 %

Correct answer: (B)
Reduced by 33.3%

75. For simply supported beams, the maximum permitted deflection, is

  1. 1/325 of the span
  2. 1/350 of the span
  3. 1/375 of the span
  4. 1/400 of the span

Correct answer: (A)
1/325 of the span

76. For steel members exposed to weather and not accessible for repainting, the thickness of steel should not be less than

  1. 4.5 mm
  2. 6 mm
  3. 8 mm
  4. 10 mm

Correct answer: (C)
8 mm

77. For steel members not exposed to weather, the thickness of steel should not be less than

  1. 4.5 mm
  2. 6 mm
  3. 8 mm
  4. 10 mm

Correct answer: (B)
6 mm

78. For the buildings having a low permeability, the internal wind pressure acting normal to the wall and roof surfaces is taken as

  1. Zero
  2. ±0.2 p
  3. ± 0.5 p
  4. ±0.7 p
    Where p is basic wind pressure

Correct answer: (B)
±0.2 p

79. For the economical design of a combined footing to support two equal column loads, the projections of beams in lower tier are kept such that bending moment under column is equal to

  1. Bending moment at the centre of the beam
  2. Half the bending moment at the centre of the beam
  3. Twice the bending moment at the centre of the beam
  4. None of these

Correct answer: (A)
Bending moment at the centre of the beam

80. For the steel member exposed to weather and accessible for repainting, the thickness of steel should not be less than (accepting the webs of Indian Standard rolled steel joists and channels).

  1. 4 mm
  2. 6 mm
  3. 8 mm
  4. 10 mm

Correct answer: (B)
6 mm

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