Design of Steel Structures

171. Steel tanks are mainly designed for

  1. Weight of tank
  2. Wind pressure
  3. Water pressure
  4. Earthquake forces

Correct answer: (C)
Water pressure

172. Stiffeners are used in a plate girder

  1. To reduce the compressive stress
  2. To reduce the shear stress
  3. To take the bearing stress
  4. To avoid bulking of web plate

Correct answer: (D)
To avoid bulking of web plate

173. Strengths of a rivet in single shearing, in bearing and in tearing are 3425 kg, 4575 kg and 5025 kg respectively. If the load in the member is 35 tonnes, the number of rivets required, is

  1. 10
  2. 11
  3. 12
  4. 13

Correct answer: (D)
13

174. Study the following statements.
(i) Top lateral bracing prevents the sides-way buckling of the chord.
(ii) Sway bracing keeps the rectangular shape of the bridge cross-section.
(iii) Sway bracing transfers the load from top of end posts to bearings.
The correct answer is

  1. Only (i)
  2. Both (i) and (ii)
  3. Both (i) and (iii)
  4. All (i), (ii) and (iii)

Correct answer: (B)
Both (i) and (ii)

175. Tacking rivets in compression plates not exposed to the weather, have a pitch not exceeding 300 mm or

  1. 16 times the thickness of outside plate
  2. 24 times the thickness of outside plate
  3. 32 times the thickness of outside plate
  4. 36 times the thickness of outside plate

Correct answer: (C)
32 times the thickness of outside plate

176. Tacking rivets in tension members, are provided at a pitch in line not exceeding

  1. 25 cm
  2. 50 cm
  3. 75 cm
  4. 100 cm

Correct answer: (D)
100 cm

177. The actual thickness of butt weld as compared to the thickness of plate is usually

  1. More
  2. Less
  3. Equal
  4. None of the above

Correct answer: (A)
More

178. The allowable shear stress in the web of mild steel beams decreases with

  1. Decrease in h/t ratio
  2. Increase in h/t ratio
  3. Decrease in thickness
  4. Increase in height
    Where 'h is thickness

Correct answer: (B)
Increase in h/t ratio

179. The allowable stress in axial tension for rolled I-sections and channels, is taken as

  1. 1420 kg/cm1
  2. 1500 kg/cm1
  3. 2125 kg/cm1
  4. 1810 kg/cm1

Correct answer: (B)
1500 kg/cm1

180. The allowable stress in axial tension is generally kept less if thickness of the member is more than

  1. 10 mm
  2. 12 mm
  3. 15 mm
  4. 20 mm

Correct answer: (D)
20 mm

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