Civil Engineering - Concrete Technology

31. 

Concrete containing

A. silicious aggregates, has higher co-efficient of expansion
B. igneous aggregates, has intermediate coefficient of expansion
C. lime stones, has lowest co-efficient of expansion
D. All the above.

Answer: Option D

Explanation:

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32. 

An ordinary Portland cement when tested for its fineness, should not leave any residue on I.S. seive No. 9, more than

A. 5%
B. 10%
C. 15%
D. 20%
E. 25%

Answer: Option B

Explanation:

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33. 

The top diameter, bottom diameter and the height of a slump mould are :

A. 10 cm, 20 cm, 30 cm
B. 10 cm, 30 cm, 20 cm
C. 20 cm, 10 cm, 30 cm
D. 20 cm, 30 cm, 10 cm
E. 30 cm, 20 cm, 10 cm

Answer: Option A

Explanation:

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34. 

Workability of concrete mix with low water cement ratio is determined by

A. tensile strength test
B. slump test
C. compaction factor test
D. flexural strength test
E. none of these.

Answer: Option C

Explanation:

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35. 

While designing an air entrained concrete

A. water cement ratio is reduced
B. proportion of aggregates is reduced
C. an allowance for the entrained air is made
D. strength of the concrete, is reduced
E. all the above.

Answer: Option E

Explanation:

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