Design of Steel Structures

91. If fbt and fc are the co-existent bending tensile stress and shear stress in a member, the equivalent stress fc is

  1. √(fbt2 + fc2)
  2. √(fbt2 + ½fc2)
  3. √(fbt2 + 3fc2)
  4. √(fbt2 - 3fc2)

Correct answer: (C)
√(fbt2 + 3fc2)

92. If L is the overall length of a combined footing having A as its area, d being the distance between the centre of gravity of the base and centre of the base, the larger width b is

  1. (A/L) + (3Ad/L2)
  2. (A/L) + (6Ad/L2)
  3. (A/L) - (6Ad/L2)
  4. (A/L) - (3Ad/L2)

Correct answer: (B)
(A/L) + (6Ad/L2)

93. If M is the moment due to a couple in a bearing plate whose width is b and allowable bending stress is P, the thickness (t) of the bending plate of the column splice, is

  1. t =√[(b × p)/6M]
  2. t =√[6M/(b × p)]
  3. t = 6M/bp
  4. t √6M/(b × p)

Correct answer: (B)
t =√[6M/(b × p)]

94. If N is the number of rivets in the joint, the strength of a riveted joint against shearing of rivets, is given by

  1. Ps = N x (π/4) d2 × Ps
  2. Ps = N × (d × t × ps)
  3. Ps = N × (p - d) × t × Ps
  4. Ps = N × (P + d) × t × ps

Correct answer: (A)
Ps = N x (π/4) d2 × Ps

95. If p and d are pitch and gross diameter of rivets, the efficiency ( ) of the riveted joint, is given by

  1. n= p/p - d
  2. n= p/p + d
  3. n= p - d/p
  4. n= p + d/p

Correct answer: (C)
n= p - d/p

96. If P is the wind pressure in kg/cm2, v is the velocity in km/hour and K is a constant of proportionality, then

  1. P = K/v2
  2. v = K/P2
  3. P = Kv2
  4. P = Kv

Correct answer: (C)
P = Kv2

97. If R is the reaction on the bearing plate, the minimum moment of. inertia of the bearing stiffener provided at the support of a plate girder of overall depth D, the maximum thickness of the compression flange T, carrying total load W, is

  1. (D2/250) × (R/W)
  2. (D3T/250) × (R/W)
  3. (DT/250) × (R/W)
  4. (DT/250) × (W/R)

Correct answer: (B)
(D3T/250) × (R/W)

98. If the 20 mm rivets are used in lacing bars, then the minimum width of lacing bar should be

  1. 40 mm
  2. 60 mm
  3. 80 mm
  4. 100 mm

Correct answer: (B)
60 mm

99. If the area of cross-section of a single angle discontinuous strut is 30 cm2 and allowable working stress corresponding to its slenderness ratio is 625 kg/cm2, the safe load carrying capacity of the member, is

  1. 10 tonnes
  2. 12 tonnes
  3. 15 tonnes
  4. 18 tonnes

Correct answer: (C)
15 tonnes

100. If the depth of the section of an upper column is smaller than the lower column

  1. Filler plates are provided with column splice
  2. Bearing plates are provided with column splice
  3. Filler plates and bearing plates are provided with column splice
  4. None of these

Correct answer: (D)
None of these

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