Concrete Technology and Design

271. The property of fresh concrete, in which the water in the mix tends to rise to the surface while placing and compacting, is called

1. Segregation
2. Bleeding
3. Bulking
4. Creep

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272. The property of the ingredients to separate from each other while placing the concrete is called

1. Segregation
2. Compaction
3. Shrinkage
4. Bulking

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273. The purpose of reinforcement in pre-stressed concrete is

1. To provide adequate bond stress
2. To resist tensile stresses
3. To impart initial compressive stress in concrete
4. All of the above

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274. The ratio of the diameter of reinforcing bars and the slab thickness is

1. 43556
2. 43586
3. 43617
4. 43678

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275. The ratio of the length to breadth of a wooden float, is

1. 4.5
2. 5.5
3. 6.5
4. 7.5

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276. The ratio of various ingredients (cement, sand, aggregates) in concrete of grade M 200, is

1. 1 : 2 : 4
2. 1 : 3 : 6
3. 1 : 1½ : 3
4. 1 : 1 : 2

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277. The recommended value of modular ratio for reinforced brick work is

1. 18
2. 30
3. 40
4. 58

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278. The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by

1. f_cr - f_cs = f_cl
2. f_cr > f_cs > f_cl
3. f_cr < f_cs < f_cl
4. f_cs > f_cr > f_cl

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279. The risk of segregation is more for

1. Wetter mix
2. Larger proportion of maximum size aggregate
3. Coarser grading
4. All the above

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280. The rock which is not calcareous, is:

1. Lime stone
2. Chalk
3. Laterite
4. None of these

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