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- Question
Di-calcium silicate (C2S)
Options- A. hydrates rapidly
- B. generates less heat of hydration
- C. hardens rapidly
- D. provides less ultimate strength to cement
- E. has less resistance to sulphate attack.
- Correct Answer
- generates less heat of hydration
- 1. 'Ware house pack' of cement means
Options- A. full capacity of the ware house
- B. pressure exertion of the bags of upper layers
- C. pressure compaction of the bags on lower layers
- D. packing the ware house
- E. none of these. Discuss
- 2. Pick up the correct statement from the following:
Options- A. Continuous grading is not necessary for obtaining a minimum of air voids
- B. The omission of a certain size of aggregate is shown by a straight horizontal line on the grading curve
- C. The omission of a certain size of aggregate in concrete increases the workability but also increases the liability to segregation
- D. All the above. Discuss
- 3. Sand generally contains salt if it is obtained from:
Options- A. nala beds
- B. river beds
- C. sea beds
- D. all the above
- E. none of these. Discuss
- 4. A concrete using an air entrained cement
Options- A. has strength less than 10% to 15%
- B. has more resistance to weathering
- C. is more plastic and workable
- D. is free from segregation and bleeding
- E. all the above. Discuss
- 5. Pick up the correct statement from the following:
Options- A. The quality of water governs the strength of concrete
- B. The quantity of water required for concreting, depends upon the grading of aggregate amd method of compaction
- C. 10% excess of water reduces the strength of concrete by 15%
- D. 30% excess of water reduces the strength of concrete by 50%
- E. All the above. Discuss
- 6. The concrete mix which causes difficulty in obtaining a smooth finish, possess
Options- A. segregation
- B. internal friction
- C. hardness
- D. bleeding
- E. none of these. Discuss
- 7. The specifications of a cement bag for storage, are
Options- A. weight 50 kg
- B. height 18 cm
- C. plan area 3000 sq. cm
- D. volume 35 litres
- E. all the above. Discuss
- 8. The aggregate impact value of the aggregate used in
Options- A. building concrete is less than 45
- B. road pavement concrete is less than 30
- C. runway concrete is less than 30
- D. all the above. Discuss
- 9. Pick up the correct statement from the following:
Options- A. The bulk density of fine aggregate is usually about 10 per cent more than that of coarse aggregate of similar composition
- B. The specific gravity of aggregate is important for the determination of the moisture content
- C. The absorption and porosity of an aggregate influence the property of the concrete
- D. A highly absorptive aggregate reduces the workability of concrete considerably
- E. All the above. Discuss
- 10. If a grading curve is horizontal bet-wen the portions of 20 mm I.S. Sieve and 4.75 mm I.S. Sieve, the graded aggregates do not contain
Options- A. 20 mm particles
- B. 10 mm particles
- C. 4.75 mm particles
- D. all the above. Discuss
Concrete Technology problems
Search Results
Correct Answer: pressure compaction of the bags on lower layers
Correct Answer: All the above.
Correct Answer: sea beds
Correct Answer: is more plastic and workable
Correct Answer: All the above.
Correct Answer: hardness
Correct Answer: all the above.
Correct Answer: all the above.
Correct Answer: All the above.
Correct Answer: all the above.
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