Design of Steel Structures

271. The risk coefficient k, depends on

1. Mean probable design life of structures
2. Basic wind speed
3. Both (A) and (B)
4. None of the above

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272. The rivets which are heated and then driven in the field, are known

1. Power driven shop rivets
2. Power driven field rivets
3. Hand driven rivets
4. Cold driven rivets

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273. The rolled steel I-sections are most commonly used as beams because these provide

1. Large moment of inertia with less cross-sectional area
2. Large moment of resistance as compared to other section
3. Greater lateral stability
4. All the above

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274. The safe working pressure for a spherical vessel 1.5 m diameter and having 1.5 cm thick wall not to exceed tensile stress 50kg/cm², is

1. 16 kg/cm²
2. 18 kg/cm²
3. 20 kg/cm²
4. 22 kg/cm²

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275. The shape factor of an isosceles triangle for bending about the axis parallel to the base is:

1. 1.5
2. 1.7
3. 2
4. 2.34

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276. The side thrust T on the tie rods provided at the end beam of jack arch of rise R, is calculated from the formula

1. T = WL/4R
2. T = WR/8L
3. T = WL/8R
4. T = WL/2R

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277. The size of a butt weld is specified by the effective throat thickness which in the case of incomplete penetration, is taken as

1. ½ of the thickness of thicker part
2. ¾ of the thickness of thicker part
3. ¾ of the thickness of thinner part
4. ⅞ of the thickness of thinner part

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278. The slenderness ratio of a column is zero when its length

1. Is zero
2. Is equal to its radius of gyration
3. Is supported on all sides throughout its length
4. Is between the points of zero moments

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279. The slenderness ratio of a column supported throughout its length by a masonry wall is

1. Zero
2. 10
3. 100
4. Infinity

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280. The slenderness ratio of lacing bars should not exceed

1. 100
2. 120
3. 145
4. 180

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