Concrete Technology problems
- 1. 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. Discuss
Correct Answer: 3/5 mean dimension
- 2. The compaction of concrete, improves
Options- A. density
- B. strength
- C. durability
- D. all the above. Discuss
Correct Answer: all the above.
- 3. 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%. Discuss
Correct Answer: 50%
- 4. 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. Discuss
Correct Answer: The mould is in the form of a frustum of hexagonal pyramid
- 5. 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. Discuss
Correct Answer: water cement ratio
- 6. Proper batching ensures
Options- A. economy
- B. durability
- C. workability
- D. strength
- E. all the above. Discuss
Correct Answer: all the above.
- 7. 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%. Discuss
Correct Answer: 25%.
- 8. Water required per bag of cement, is
Options- A. 7 kg
- B. 14 kg
- C. 21 kg
- D. 28 kg
- E. 35 kg Discuss
Correct Answer: 35 kg
- 9. 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. Discuss
Correct Answer: all the above.
- 10. For batching 1:3:6 concrete mix by volume, the ingredients required per bag of 50 kg cement, are:
Options- A. 70 litres of sand and 120 litres of aggregates
- B. 70 kg of sand and 140 litres of aggregates
- C. 105 litres of sand and 140 litres of aggregates
- D. 105 litres of sand and 210 litres of aggregates
- E. none of these. Discuss
Correct Answer: 105 litres of sand and 210 litres of aggregates
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