Concrete Technology problems
- 1. Transport of concrete by pumps, is done for a distance of
Options- A. 100 m
- B. 200 m
- C. 300 m
- D. 400 m
- E. none of these. Discuss
Correct Answer: 400 m
- 2. An aggregate is said to be flaky if its least dimension is less than
Options- A. 1/5th of mean dimension
- B. 2/5th of mean dimension
- C. 3/5th of mean dimension
- D. 4/5th of mean dimension
- E. none of these. Discuss
Correct Answer: 3/5th of mean dimension
- 3. Vicat's apparatus is used for
Options- A. fineness test
- B. consistency test
- C. setting time test
- D. soundness test
- E. compressive strength test. Discuss
Correct Answer: consistency test
- 4. To ensure constant moisture content in aggregates
Options- A. area of each aggregate pile should be large
- B. height of each aggregate pile should not exceed 1.50 m
- C. aggregate pile should be left for 24 hours before aggregates are used
- D. conical heaps of aggregates should be avoided to prevent moisture variation
- E. all the above. Discuss
Correct Answer: all the above.
- 5. While compacting the concrete by a mechanical vibrator, the slump should not exceed
Options- A. 2.5 cm
- B. 5.0 cm
- C. 7.5 cm
- D. 10 cm
- E. 15 cm Discuss
Correct Answer: 5.0 cm
- 6. Construction joints are generally provided in concrete
Options- A. roads
- B. retaining walls
- C. lining of canals
- D. lining of tunnels
- E. all the above. Discuss
Correct Answer: all the above.
- 7. For quality control of Portland cement, the test essentially done is
Options- A. setting time
- B. soundness
- C. tensile strength
- D. consistency
- E. all the above. Discuss
Correct Answer: all the above.
- 8. The maximum amount of dust which may be permitted in aggregates is
Options- A. 5% of the total aggregates for low workability with a coarse grading
- B. 10% of the total aggregates for low workability with a fine grading
- C. 20% of the total aggregates for a mix having high workability with fine grading
- D. all the above. Discuss
Correct Answer: all the above.
- 9. Pick up the correct statement from the following:
Options- A. Insufficient quantity of water makes the concrete mix harsh
- B. Insufficient quantity of water makes the concrete unworkable
- C. Excess quantity of water makes the concrete segregated
- D. Excess quantity of water causes bleeding in concrete
- E. All the above. Discuss
Correct Answer: All the above.
- 10. For the construction of cement concrete floor, the maximum permissible size of aggregate, is
Options- A. 4 mm
- B. 6 mm
- C. 8 mm
- D. 10 mm
- E. 12 mm Discuss
Correct Answer: 10 mm
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