design of steel structures Mcqs
51. Hudsons formula gives the dead weight of a truss bridge as a function of_________________?
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A. heaviest axle load of engine

B. top chord area

C. bottom chord area

D. effective span of bridge

53. In case of timber structures, the simple bending formula M = fz may be applied for________________?
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A. solid circular beams only

B. all rectangular beams

C. all square cross-section beams

D. rectangular beams up to 300 mm depth
54. The range of economical spacing of trusses varies from________________?
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A. L/3 to L/5

B. 2L/5 to 3L/5 where L is span

C. L/3 to L/2

D. L/4to2L/5

55. As per IS:800, in the plastic design, which of the following pairs are correctly matched? Working Loads Load factor________________?
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A. ) Dead Load + imposed load 1.7

B. i) Dead load + load due to wind or 1.3 seismic forces

C. ) Dead load + imposed load + load 1.7</strong>

D. Dead load 1.7
56. Which of the following sections should preferably be used at places where torsion occurs ?
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A. any of the above

B. angle section

C. channel section

D. box type section
57. Generally the purlins are placed at the panel points so as to avoid__________________?
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A. bending moment in rafter

B. shear force in rafter

C. axial force in rafter

D. deflection of rafter

60. When the axis of load lies in the plane of rivet group, then the most heavily loaded rivet will be the one which________________?
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A. is at the maximum distance from CG of the rivet group

B. gives the maximum angle between the two forces Fa and Fm

C. gives the minimum angle between the two forces Fa and Fm

D. is at the minimum distance from CG of the rivet group

66. Gantry girders are designed to resist_________________?
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A. longitudinal loads and vertical loads

B. lateral and longitudinal loads

C. lateral loads

D. lateral, longitudinal and vertical loads
69. A butt weld is specified by__________________?
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A. effective throat thickness

B. size of weld

C. plate thickness

D. penetration thickness

71. The external wind pressure acting on a roof depends on__________________?
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A. degree of permeability of roof

B. slope of roof

C. both (A) and (B)

D. none of the above

72. Economical depth of a plate girder corresponds to_________________?
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A. minimum thickness of web

B. minimum depth

C. maximum weight

D. minimum weight
73. Formation of snow occurs if the cloud temperature is________________?
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A. None of these

B. Below the freezing point

C. At the freezing point

D. Just above the freezing point

75. The web crippling due to excessive bearing stress can be avoided by_________________?
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A. providing suitable stiffeners

B. increasing the length of the bearing plates

C. none of the above

D. increasing the web thickness

78. Horizontal stiffener in a plate girder is provided to safeguard against_______________?
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A. shear buckling of web plate

B. yielding

C. compression buckling of web plate

D. all of the above

80. compression force in two end posts The pin of a rocker bearing in a bridge is designed for_________________?
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A. bearing, shear and bending

B. bending and shear

C. bearing and shear

D. bearing and bending

81. Lug angles_________________?
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A. are used to reduce the length of connection.

B. all the above

C. increases shear lag.

D. are unequal angles.

82. Battening is preferable when the________________?
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A. space between the two main components is not very large

B. ) column is eccentrically loaded </strong>

C. correct answer is

D. column carries axial load only
84. Lacing bars in a steel column should be designed to resist_________________?
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A. bending moment due to 2.5% of the column load

B. shear force due to 2.5% of the column load

C. 2.5% of the column load

D. both (A) and (B)

91. The centrifugal force due to curvature of track is assumed to act on the bridge at a height of___________________?
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A. 1.83 m above the rail level

B. 1.23 m above the rail level

C. 2.13 m above the rail level

D. 1.50 m above the rail level

93. Load factor is____________________?
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A. always equal to factor of safety

B. always less than factor of safety

C. always greater than factor of safety

D. sometimes greater than factor of safety

95. The forces acting on the web splice of a plate girder are__________________?
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A. shear and bending forces

B. shear and axial forces

C. axial forces

D. axial and bending forces

96. The moment-curvature relation at a plastic hinge is________________?
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A. linear

B. parabolic

C. constant moment for all curvatures

D. constant curvature for all moments

99. Steel tanks are mainly designed for_______________________?
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A. earthquake forces

B. wind pressure

C. weight of tank

D. water pressure
100. For rivets in tension with counter-sunk heads, the tensile value shall be____________________?
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A. reduced by 33.3%

B. reduced by 25 %

C. increased by 33.3 %

D. increased by 25 %