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Concrete Technology
Comments
Question
Pick up the correct statement from the following:
Options
A. An increase in water content must be accompanied by an increase in cement content
B. Angular and rough aggregates reduce the workability of the concrete
C. Large size aggregates increase the workability due to lesser surface area
D. The slump of the concrete mix decreases due to an increase in temperature
E. All the above.
Correct Answer
All the above.
Concrete Technology problems
Search Results
1. Permissible compressive strength of M 150 concrete grade is
Options
A. 100 kg/cm
2
B. 150 kg/cm
2
C. 200 kg/cm
2
D. 250 kg/cm
2
E. 300 kg/cm
2
Show Answer
Scratch Pad
Discuss
Correct Answer: 150 kg/cm
2
2. For the construction of cement con-certe dams, the maximum permissible size of the aggregates, is
Options
A. 40 mm
B. 50 mm
C. 60 mm
D. 70 mm
E. 80 mm
Show Answer
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Discuss
Correct Answer: 40 mm
3. Water cement ratio is
Options
A. volume of water to that of cement
B. weight of water to that of cement
C. weight of concrete to that of water
D. volume of concrete to that of water
E. both (a) and (b) of the above.
Show Answer
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Discuss
Correct Answer: both (a) and (b) of the above.
4. Workability of concrete mix with low water cement ratio is determined by
Options
A. tensile strength test
B. slump test
C. compaction factor test
D. flexural strength test
E. none of these.
Show Answer
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Discuss
Correct Answer: compaction factor test
5. An ordinary Portland cement when tested for its fineness, should not leave any residue on I.S. seive No. 9, more than
Options
A. 5%
B. 10%
C. 15%
D. 20%
E. 25%
Show Answer
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Correct Answer: 10%
6. The top diameter, bottom diameter and the height of a slump mould are :
Options
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
Show Answer
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Correct Answer: 10 cm, 20 cm, 30 cm
7. For concreting tunnel linings, tran-portation of concrete is done by
Options
A. pans
B. wheel borrows
C. containers
D. pumps
E. belt conveyors.
Show Answer
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Discuss
Correct Answer: pumps
8. The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as
Options
A. low-heat Portland cement
B. rapid hardening Portland cement
C. Portland blast slag cement
D. Portland pozzolana cement
E. none of these.
Show Answer
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Correct Answer: low-heat Portland cement
9. Saw dust can be rendered chemically inert by boiling it in water containing
Options
A. ferrous sulphate
B. potassium chloride
C. ammonia
D. nitric acid
E. sulphuric acid.
Show Answer
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Correct Answer: ferrous sulphate
10. The operation of removing humps and hollows of uniform concrete surface, is known as
Options
A. floating
B. screeding
C. trowelling
D. finishing
E. none of these.
Show Answer
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Discuss
Correct Answer: screeding
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