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Concrete Technology
Comments
Question
The diameter of the Vicat plunger is 10 mm and its length varies from
Options
A. 20 mm to 30 mm
B. 30 mm to 40 mm
C. 40 mm to 50 mm
D. 50 mm to 60 mm
E. none of these.
Correct Answer
40 mm to 50 mm
Concrete Technology problems
Search Results
1. The shrinkage of concrete
Options
A. is proportional to water content is the mix
B. is proportional to cement concrete
C. increases with age of concrete
D. all the above.
Show Answer
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Discuss
Correct Answer: all the above.
2. Efflorescence in cement is caused due to an excess of
Options
A. alumina
B. iron oxide
C. silica
D. alkalis
E. magnesium oxide.
Show Answer
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Discuss
Correct Answer: alkalis
3. The most useless aggregate is one whose surface texture is
Options
A. smooth
B. granular
C. glassy
D. honey combed and porous.
Show Answer
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Discuss
Correct Answer: glassy
4. Pick up the correct statement from the following:
Options
A. Sand stones may be divided into calcareous, siliceous and ferrugineous sand stones
B. Concrete using sand stones, cracks due to excessive shrinkage
C. Very hard and close grained crystallined lime stones are suitable aggregates but provide low strength
D. Broken bricks produce a concrete having good fire resisting qualities
E. All the above.
Show Answer
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Discuss
Correct Answer: All the above.
5. Pozzolana cement is used with confidence for construction of
Options
A. dams
B. massive foundations
C. abutments
D. R.C.C. structures
E. all the above.
Show Answer
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Discuss
Correct Answer: all the above.
6. Allowable shear strength of concrete, depends upon
Options
A. shear strength
B. tensile strength
C. compressive strength
D. none of these.
Show Answer
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Discuss
Correct Answer: shear strength
7. While designing an air entrained concrete
Options
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.
Show Answer
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Discuss
Correct Answer: all the above.
8. Concrete containing
Options
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.
Show Answer
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Discuss
Correct Answer: All the above.
9. According to Water-Cement Ratio Law, the strength of workable plastic concrete
Options
A. depends upon the amount of water used in the mix
B. does not depend upon the quality of cement mixed with aggregates
C. does not depend upon the quanity of cement mixed with aggregates
D. all the above.
Show Answer
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Discuss
Correct Answer: all the above.
10. The factor which affects workability, is
Options
A. water content and its temperature
B. shape and size of the aggregates
C. grading and surface textures of the aggregates
D. air entraining agents
E. all the above.
Show Answer
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Discuss
Correct Answer: all the above.
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