Design of Steel Structures

281. The spans are considered approximately equal if the longest span does not exceed the shortest span by more than

  1. 5 %
  2. 10 %
  3. 15 %
  4. 20 %

Correct answer: (C)
15 %

282. The statical method of plastic analysis satisfies

  1. Equilibrium and mechanism conditions
  2. Equilibrium and plastic moment conditions
  3. Mechanism and plastic moment conditions
  4. Equilibrium condition only

Correct answer: (B)
Equilibrium and plastic moment conditions

283. The strength of a riveted lap joint is equal to its

  1. Shearing strength
  2. Bearing strength
  3. Tearing strength
  4. Least of (a), (b) and (c)

Correct answer: (D)
Least of (a), (b) and (c)

284. The strength of ISA 125 = 75 × 10 mm used as a tie member with its longer leg connected at the ends by 27 mm diameter rivets, is

  1. 26,000 kg
  2. 26,025 kg
  3. 26,050 kg
  4. 26,075 kg

Correct answer: (D)
26,075 kg

285. The stress in the wall of a thin cylinder subjected to internal pressure, is

  1. Hoop compression
  2. Shear
  3. Torsional shear
  4. Hoop tension

Correct answer: (D)
Hoop tension

286. The sway bracing is designed to transfer

  1. 2Vi % of the top panel wind load to bottom bracing
  2. 10% of the top panel wind load to bottom bracing
  3. 25% of the top panel wind load to bottom bracing
  4. 50% of the top panel wind load to bottom bracing

Correct answer: (D)
50% of the top panel wind load to bottom bracing

287. The tensile strength of mild steel for bolts and nuts should not be less than

  1. 32 kg/mm2
  2. 36 kg/mm2
  3. 40 kg/mm2
  4. 44 kg/mm2

Correct answer: (D)
44 kg/mm2

288. The thickness of the web of a mild steel plate girder is less than d/200. If only one horizontal stiffener is used, it is placed at

  1. The neutral axis of the section
  2. 2/3rd of the depth of the neutral axis from the compression flange
  3. 2/5th of the depth of the neutral axis from the compression flange
  4. 2/5th of the height of the neutral axis from tension flange

Correct answer: (C)
2/5th of the depth of the neutral axis from the compression flange

289. The thickness t of a single flat lacing should not be less than

  1. 1/30th length between inner end rivets
  2. 1/40th length between inner end rivets
  3. 1/50th length between inner end rivets
  4. 1/60th length between inner end rivets

Correct answer: (B)
1/40th length between inner end rivets

290. The use of tie plates in laced columns is

  1. Prohibited
  2. Not prohibited
  3. Permitted at start and end of lacing system only
  4. Permitted between two parts of the lacing

Correct answer: (C)
Permitted at start and end of lacing system only

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