Concrete Technology and Design

291. The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is

1. Rounded aggregate
2. Irregular aggregate
3. Angular aggregate
4. Flaky aggregate

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292. The type of aggregates of same nominal size, which contain less voids when compacted, are

1. Rounded spherical
2. Irregular
3. Flaky
4. None of these

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293. The void ratio of

1. Single size coarse aggregate is roughly 0.45
2. Graded coarse aggregate is roughly 0.040
3. Fine aggregate is roughly 0.45
4. All the above

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294. To determine the modulus of rupture, the size of test specimen used is

1. 150 × 150 × 500 mm
2. 100 × 100 × 700 mm
3. 150 × 150 × 700 mm
4. 100 × 100 × 500 mm

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295. To ensure constant moisture content in aggregates

1. Area of each aggregate pile should be large
2. Height of each aggregate pile should not exceed 1.50 m
3. Aggregate pile should be left for 24 hours before aggregates are used
4. All the above

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296. To hydrate 500kg of cement full water needed, is

1. 100 kg
2. 110 kg
3. 120 kg
4. 130 kg

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297. To minimise the effect of differential settlement, the area of a footing should be designed for

1. Dead load only
2. Dead load + live load
3. Dead load + fraction of live load
4. Live load + fraction of dead load

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298. To obtain a very high strength concrete, use very fine grained

1. Granite
2. Magnetite
3. Barite
4. Volcanic scoria

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299. To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between

1. 1100° and 1200°C
2. 1200° and 1300°C
3. 1300° and 1400°C
4. 1400° and 1500°C

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300. To prevent segregation, the maximum height for placing concrete, is

1. 100 cm
2. 125 cm
3. 150 cm
4. 200 cm

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