design of steel structures MCQs – Page 2

Practise focused design of steel structures questions with marked answers for exam preparation and subject revision.

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

52. The effective length of a battened column is increased by_________________?
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A. 5%

B. 10%

C. 15%

D. 20%

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

58. Minimum thickness of web in a plate girder, when the plate is accessible and also exposed to weather, is______________?
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A. 10 mm

B. 5 mm

C. 8 mm

D. 6 mm
59. A steel beam supporting loads from the floor slab as well as from wall is termed as________________?
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A. stringer beam

B. header beam

C. spandrel beam

D. lintel beam

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

61. The slenderness ratio of a column supported throughout its length by a masonry wall is________________?
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A. zero

B. 10

C. infinity

D. 100

62. If the floor is supported at or near the bottom but top chords of a bridge are not braced, then the bridge is called________________?
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A. double deck type

B. through type

C. half through type

D. deck type

63. The heaviest I-section for same depth is_________________?
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A. ISHB

B. ISLB

C. ISWB

D. ISMB

64. The effective length of a battened strut effectively held in position at both ends but not restrained in direction is taken as________________?
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A. 1.5 L

B. 1.1 L

C. L

D. 1.8 L

65. The difference between gross diameter and nominal diameter for the rivets up to 25 mm diameter is__________________?
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A. 1.0 mm

B. 2.5 mm

C. 2.0 mm

D. 1.5 mm
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
67. For a standard 45 fillet, the ratio of size of fillet to throat thickness is_______________?
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A. 1:01

B. 1 : V2

C. 2:01

D. V2 : 1
68. The maximum slenderness ratio of a steel column, the design of which is governed by wind or seismic forces is________________?
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A. 350

B. 250

C. 150

D. 180

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

70. The maximum permissible span of asbestos cement sheets is______________________?
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A. 810 mm

B. 650 mm

C. 1680 mm

D. 1250 mm

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

74. The minimum thickness of a steel plate, which is directly exposed to weather and is not accessible for cleaning and repainting, should be___________________?
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A. 8 mm

B. 10 mm

C. 6 mm

D. 4.5 mm

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

76. In case of timber structures, the form factor for solid circular cross-section is taken as_________________?
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A. 1.414

B. 1.67

C. 1.81

D. 1.18
77. For the buildings having a low permeability, the internal wind pressure acting normal to the wall and roof surfaces is taken as__________________?
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A. 0.2p

B. 0.5 p

C. 0.7p

D. re p is basic wind pressure

E. zero

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

79. If the loaded length of span in meters of a railway steel bridge carrying a single track is 6 m, then impact factor is taken as_________________?
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A. 1

B. between 0.5 and 1.0

C. 0.5

D. 0

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
83. The connection of intermediate vertical stiffeners to the web, not subjected to external loads, shall be designed for a minimum shear force (kN/m) of___________________?
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A. 75 t2/h

B. 175 t2/h

C. 125 t2/h

D. 125 t3/h2

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)

85. Minimum spacing of vertical stiffeners is limited to________________?
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A. 2d/3

B. d/3

C. d/2

D. d/4

86. The live load for a sloping roof with slope 15, where access is not provided to roof, is taken as_______________?
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A. 0.75 kN/m2

B. 1.35 kN/m2

C. 0.65 kN/m2

D. 1.50 kN/m2

87. As per IS : 875, for the purposes of specifying basic wind velocity, the country has been divided into_____________________?
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A. 7 zones

B. 5 zones

C. 4 zones

D. 6 zones
88. The overlap of batten plates with the main members in welded connections should be more than____________________?
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A. 6t

B. 8t

C. 4t

D. 3t

E. re t = thickness of the batten plate

89. Intermediate vertical stiffeners in a plate girder need be provided if the depth of web exceeds___________________?
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A. 2501

B. 200 t

C. 501

D. 851
90. In the virtual work method, the virtual quantity is_________________?
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A. load

B. displacement

C. slope

D. moment

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

92. To minimize the total cost of a roof truss, the ratio of the cost of truss to the cost of purlins shall be_______________?
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A. 3

B. 2

C. 4

D. 1

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

94. The maximum spacing of vertical stiffeners is_________________?
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A. 1.5 d

B. 1.33 d

C. 1.75 d

D. 1.25 d

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

97. The basic wind speed is specified at a height h above mean ground level in an open terrain. The value ofh is__________________?
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A. 50 m

B. 25 m

C. 10 m

D. 20 m

98. The shape factor of an isosceles triangle for bending about the axis parallel to the base is________________?
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A. 1.5

B. 1.7

C. 2.34

D. 2

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 %