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Concrete Technology
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Question
Sand requiring a high water cement ratio, belongs to
Options
A. Zone I
B. Zone II
C. Zone III
D. Zone IV.
Correct Answer
Zone I
Concrete Technology problems
Search Results
1. Pick up the incorrect statement from the following:
Options
A. Tricalcium silicate (C
3
S) hydrates rapidly
B. Tricalcium silicate (C
3
S) generates more heat of hydration
C. Tricalcium silicate (C
3
S) develops early strength
D. Tricalcium silicate (C
3
S) has more resistance to sulphate attack
E. None of these.
Show Answer
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Discuss
Correct Answer: Tricalcium silicate (C
3
S) has more resistance to sulphate attack
2. Ordinary Portland cement is manufactured from
Options
A. lime stone and clay
B. gypsum and lime
C. pozzolana
D. lime, pozzolana and clay.
Show Answer
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Discuss
Correct Answer: gypsum and lime
3. If the average compressive strength is 4000 kg/cm
2
and standard deviation is 500, the co-efficient of variation is
Options
A. 10%
B. 12.5%
C. 15%
D. 18.5 %
E. 20%
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Correct Answer: 12.5%
4. The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than
Options
A. 30 minutes
B. 40 minutes
C. 60 minutes
D. 75 minutes
E. 90 minutes.
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Correct Answer: 30 minutes
5. Joints in concrete structures, are provided
Options
A. to reduce the tensile stresses likely to be developed due to evaporation of water
B. to minimise the change in the dimensions of the slab
C. to minimise the necessary cracking
D. all the above.
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Correct Answer: all the above.
6. An ideal ware house, is provided
Options
A. water proof masonry walls
B. water proof roof
C. few windows which remain generally closed
D. 15 cm thick concrete floor laid on a dry course of soling
E. all the above.
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Correct Answer: all the above.
7. Gypsum is added for
Options
A. colour
B. strength
C. controlling setting time
D. none of these.
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Correct Answer: controlling setting time
8. If the various concrete ingredients i.e. cement, sand and aggregates are in the ratio of 1:3:6, the grade of concrete, is
Options
A. M 100
B. M 150
C. M 200
D. M 250
E. M 300
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Correct Answer: M 100
9. Pick up the incorrect statement from the following:
Options
A. Admixtures accelerate hydration
B. Admixtures make concrete water proof
C. Admixtures make concrete acid proof
D. Admixtures give high strength
E. None of these.
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Correct Answer: Admixtures accelerate hydration
10. Non-uniform compaction may cause the concrete
Options
A. porous
B. non-homogeneous
C. reduced strength
D. all the above.
Show Answer
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Discuss
Correct Answer: all the above.
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