Design of Steel Structures

251. The minimum thickness of a steel plate, which is directly exposed to weather and is not accessible for cleaning and repainting, should be:

1. 4.5 mm
2. 6 mm
3. 8 mm
4. 10 mm

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252. The minimum thickness of plates in a steel stack should be

1. 4 mm
2. 5 mm
3. 6 mm
4. 8 mm

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253. The minimum width B of a solid casing for a cased beam, is equal to

1. B = b + 25 mm
2. B = b + 50 mm
3. B = b + 75 mm
4. B = b + 100 mm

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254. The moment of the couple set up in a section of a beam by the longitudinal compressive and tensile force, is known as

1. Bending moment
2. Moment of resistance
3. Flexural stress moment
4. None of these

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255. The moment-curvature relation at a plastic hinge is

1. Linear
2. Parabolic
3. Constant moment for all curvatures
4. Constant curvature for all moments

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256. The most commonly used sections in lateral system to carry shear force in built up columns, are

1. Rolled steel flats
2. Rolled angles
3. Rolled channels
4. All the above

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257. The most economical section for a column, is

1. Rectangular
2. Solid round
3. Flat strip
4. Tubular section

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258. The net area of round bars to resist the tension, is the area of cross section at

1. Mid-section
2. Root of the thread
3. Difference of (a) and (b)
4. None of these

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259. The number of seismic zones in which the country has been divided is

1. 3
2. 5
3. 6
4. 7

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260. The overlap of batten plates with the main members in welded connections should be more than

1. 3 t
2. 4 t
3. 6 t
4. 8 t
   Where 't'= thickness of the batten plate

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