RCC Structures Design

171. The diameter of longitudinal bars of a column should never be less than

1. 6 mm
2. 8 mm
3. 10 mm
4. 12 mm

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172. The diameter of main bars in R.C.C. columns, shall not be less than

1. 6 mm
2. 8 mm
3. 10 mm
4. 12 mm

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173. The diameter of the column head support a flat slab, is generally kept

1. 0.25 times the span length
2. 0.25 times the diameter of the column
3. 4.0 cm larger than the diameter of the column
4. 5.0 cm larger than the diameter of the column

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174. The diameter of transverse reinforcement of columns should be equal to one-fourth of the diameter of the main steel rods but not less than

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

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175. The effective span of a simply supported slab, is

1. Distance between the centres of the bearings
2. Clear distance between the inner faces of the walls plus twice the thickness of the wall
3. Clear span plus effective depth of the slab
4. None of these

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176. The effective width of a column strip of a flat slab, is

1. One-fourth the width of the panel
2. Half the width of the panel
3. Radius of the column
4. Diameter of the column

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177. The floor slab of a building is supported on reinforced cement floor beams. The ratio of the end and intermediate spans is kept

1. 0.7
2. 0.8
3. 0.9
4. 0.6

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178. The horizontal portion of a step in a stairs case, is known as

1. Rise
2. Flight
3. Winder
4. Tread

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179. The length of lap in tension reinforcement should not be less than the bar diameter × (actual tension / four times the permissible average bond stress) if it is more than

1. 18 bar diameters
2. 24 bar diameters
3. 30 bar diameters
4. 36 bar diameters

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180. The length of the lap in a compression member is kept greater than bar diameter x (Permissible stress in bar / Five times the bond stress) or

1. 12 bar diameters
2. 18 bar diameters
3. 24 bar diameters
4. 30 bar diameters

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