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Concrete Technology
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Question
Pick up the incorrect statement from the following:
Options
A. The bottom and top ends of slump mould are parallel to each other
B. The axis of the mould is perpendicular to the end faces
C. The internal surface of the mould is kept clean and free from set cement
D. The mould is in the form of a frustum of hexagonal pyramid
E. None of these.
Correct Answer
The mould is in the form of a frustum of hexagonal pyramid
Concrete Technology problems
Search Results
1. The percentage of the aggregate of F.M. 2.6 to be combined with coarse aggregate of F.M. 6.8 for obtaining the aggregates of F.M. 5.4, is
Options
A. 30%
B. 40%
C. 50%
D. 60%.
Show Answer
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Discuss
Correct Answer: 50%
2. The compaction of concrete, improves
Options
A. density
B. strength
C. durability
D. all the above.
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Correct Answer: all the above.
3. An aggregate is said to be flaky, if its least dimension is less than
Options
A. 2/3 mean dimension
B. 3/4 mean dimension
C. 3/5 mean dimension
D. 5/8 mean dimension
E. none of these.
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Correct Answer: 3/5 mean dimension
4. Pick up the correct statement from the following i.
Options
A. Higher workability indicates unexpected increase in the moisture content
B. Higher workability indicates deficiency of sand
C. If the concrete mix is dry, the slump is zero
D. Concrete mix having zero slump, is unsuitable for high strength.
E. All the above.
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Correct Answer: All the above.
5. Shrinkage in concrete can be reduced by using
Options
A. low water cement ratio
B. less cement in the concrete
C. proper concrete mix
D. presaturated aggregates
E. all the above.
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Correct Answer: all the above.
6. C.R.R.I. charts are used to obtain a relatioship between strength of concrete and
Options
A. water cement ratio
B. workability
C. grading of aggregate
D. fineness modulus
E. none of these.
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Correct Answer: water cement ratio
7. Proper batching ensures
Options
A. economy
B. durability
C. workability
D. strength
E. all the above.
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Correct Answer: all the above.
8. If the depth of moist sand in a cylinder is 15 cm and the depth of the sand when fully inundated with water is 12 cm, the bulking of the moist sand, is
Options
A. 10%
B. 12%
C. 15%
D. 20%
E. 25%.
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Correct Answer: 25%.
9. Water required per bag of cement, is
Options
A. 7 kg
B. 14 kg
C. 21 kg
D. 28 kg
E. 35 kg
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Correct Answer: 35 kg
10. Addition of pozzolana to ordinary port land cement, causes
Options
A. decrease in early strength
B. reduction in chemical action with sulphates
C. increase in shrinkage
D. reduction bleeding
E. all the above.
Show Answer
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Correct Answer: all the above.
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