Design of Steel Structures

111. In a built up beam actual bending compressive stress fbc is given by (when y1 is the distance of the edge of the beam from the neutral axis).

  1. fbc = (M/Ixx) × y1
  2. fbc = (Ixx/M) × y1
  3. fbc = (Ixx/M) + y1
  4. fbc = (M/Ixx) + y1

Correct answer: (A)
fbc = (M/Ixx) × y1

112. In a built up section carrying a tensile force, the flanges of two channels are turned outward

  1. To simplify the transverse connections
  2. To minimise lacing
  3. To have greater lateral rigidity
  4. All the above

Correct answer: (C)
To have greater lateral rigidity

113. In a fillet weld placed on the sides of the base, the metal experiences

  1. Shear
  2. Tension
  3. Compression
  4. All the above

Correct answer: (D)
All the above

114. In a grillage footing, the maximum shear force occurs at the

  1. Edge of grillage beam
  2. Centre of base plate
  3. Centre of grillage beam
  4. Centre of base plate

Correct answer: (B)
Centre of base plate

115. In a gusseted base, when the end of the column is machined for complete bearing on the base plate, then the axial load is assumed to be transferred to base plate

  1. Fully by direct bearing
  2. Fully through fastenings
  3. 50% by direct bearing and 50% through fastenings
  4. 75% by direct bearing and 25% through fastenings

Correct answer: (C)
50% by direct bearing and 50% through fastenings

116. In a tension member if one or more than one rivet holes are off the line, the failure of the member depends upon:

  1. Pitch
  2. Gauge
  3. Diameter of the rivet holes
  4. All the above

Correct answer: (D)
All the above

117. In a truss girder of a bridge, a diagonal consists of mild steel flat 4001.S.F. and carries a pull of 80 tonnes. If the gross-diameter of the rivet is 26 mm, the number of rivets required in the splice, is

  1. 6
  2. 7
  3. 8
  4. 9

Correct answer: (C)
8

118. In case horizontal stiffeners are not used, the distance between vertical legs of flange angles at the top and bottom of a plate girder, is known as

  1. Overall depth
  2. Clear depth
  3. Effective depth
  4. None of these

Correct answer: (B)
Clear depth

119. In case of cantilever fillers, the ratio of the span L to depth d, should not exceed

  1. 4
  2. 8
  3. 12
  4. 16

Correct answer: (C)
12

120. In case of plastic design, the calculated maximum shear capacity of a beam as per IS: 800 shall be

  1. 0.55 Aw.fy
  2. 0.65 Aw.fy
  3. 0.75 Aw.fy
  4. 0.85 Aw.fy
    Where, Aw = effective cross-sectional area resisting shear fy = yield stress of the steel

Correct answer: (A)
0.55 Aw.fy

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