Design of Steel Structures

261. The permissible bearing stress in steel, is

1. 1500 kg/cm²
2. 1890 kg/cm²
3. 2025 kg/cm²
4. 2340 kg/cm²

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262. The permissible stress in bending for rolled steel I-beams and channels, is

1. 1500 kg/cm²
2. 1575 kg/cm²
3. 945 kg/cm²
4. 1650 kg/cm²

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263. The permissible stress to which a structural member can be subjected to, is known as

1. Bearing stress
2. Working stress
3. Tensile stress
4. Compressive stress

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264. The portal bracing in a truss bridge is used to

1. Transfer load from top of end posts to bearings
2. Keep the rectangular shape of the bridge cross-section
3. Stiffen the structure laterally
4. Prevent the sides-way buckling of top chord

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265. The range of economical spacing of trusses varies from

1. L/3 to L/5
2. L/4 to 2L/5
3. L/3 to L/2
4. 2L/5 to 3L/5, where L is span

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266. The ratio of hydrostatic stress to the volumetric strain within the elastic range, is called

1. Modulus of elasticity
2. Shear modulus of elasticity
3. Bulk modulus of elasticity
4. All the above

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267. The ratio of longitudinal stress to strain within elastic limit, is known as

1. Modulus of elasticity
2. Shear modulus of elasticity
3. Bulk modulus of elasticity
4. All the above

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268. The ratio of plastic section modulus to elastic section modulus

1. Is equal to 1
2. Is always less than 1
3. Is always greater than 1
4. Can be less than 1

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269. The ratio of shearing stress to shearing strain within elastic limit, is known as

1. Modulus of elasticity
2. Shear modulus of elasticity
3. Bulk modulus of elasticity
4. Tangent modulus of elasticity

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270. The ratio of the span L of the filler joists to the depth d from the underside of the joist to the top of the structural concrete, should not exceed

1. 60
2. 45
3. 35
4. 25

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