Concrete Technology and Design

251. The maximum percentage of chemical ingredient of cement is that of

1. Magnesium oxide
2. Iron oxide
3. Silica
4. Lime

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252. The maximum thickness of concrete floor of a cement warehouse, is

1. 10 cm
2. 15 cm
3. 20 cm
4. 25 cm

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253. The maximum value of hoop compression in a dome is given by

1. wR / 4d
2. wR/2d
3. wR/d
4. 2wR/d
   Where, w = load per unit area of surface of dome R = radius of curvature d = thickness of dome

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254. The minimum cover in a slab should neither be less than the diameter of bar nor less than

1. 10 mm
2. 15 mm
3. 25 mm
4. 13 mm

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255. The minimum cover to the ties or spirals should not be less than

1. 15 mm
2. 20 mm
3. 25 mm
4. 50 mm

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256. The minimum diameter of longitudinal bars in a column is

1. 6 mm
2. 8 mm
3. 12 mm
4. 16 mm

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257. The minimum percentage of chemical ingredient of cement is that of

1. Magnesium oxide
2. Iron oxide
3. Alumina
4. Lime

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258. The mixture of different ingredients of cement, is burnt at

1. 1000°C
2. 1200°C
3. 1400°C
4. 1600°C

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259. The most commonly used admixture which prolongs the setting and hardening time is

1. Gypsum
2. Calcium chloride
3. Sodium silicate
4. All of the above

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260. The most useless aggregate is one whose surface texture is

1. Smooth
2. Granular
3. Glassy
4. Honey combed and porous

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