Concrete Technology and Design

301. Too wet concrete may cause

1. Weakness of concrete
2. Excessive laitance
3. Segregation
4. All the above

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302. Transport of concrete by pumps, is done for a distance of

1. 100 m
2. 200 m
3. 300 m
4. 400 m

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303. Tricalcium aluminate (C3A)

1. Reacts fast with water
2. Generates less heat of hydration
3. Causes initial setting and early strength of cement
4. Does not contribute to develop ultimate strength

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304. Ultimate strength of cold drawn high steel wires

1. Increases with increase in diameter of bar
2. Decreases with increase in diameter of bar
3. Does not depend on diameter of bar
4. None of the above

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305. Under normal conditions using an ordinary cement, the period of removal of the form work, is:

1. 7 days for beam soffits
2. 14 days for bottom slabs of spans 4.6 m and more
3. 21 days for bottom beams over 6 m spans
4. All the above

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306. Vicat apparatus is used for

1. Fineness test
2. Consistency test
3. Test for setting time
4. Test for tensile strength

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307. Vicat's apparatus is used for

1. Fineness test
2. Consistency test
3. Setting time test
4. Soundness test

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308. Water cement ratio is

1. Volume of water to that of cement
2. Weight of water to that of cement
3. Weight of concrete to that of water
4. Both (a) and (b) of the above

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309. Water cement ratio is generally expressed in volume of water required per

1. 10 kg
2. 20 kg
3. 30 kg
4. 50 kg

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310. Water required per bag of cement, is

1. 7 kg
2. 14 kg
3. 21 kg
4. 35 kg

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