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- Question
Ordinary Portland cement is manufactured from
Options- A. lime stone and clay
- B. gypsum and lime
- C. pozzolana
- D. lime, pozzolana and clay.
- Correct Answer
- gypsum and lime
- 1. If the average compressive strength is 4000 kg/cm2 and standard deviation is 500, the co-efficient of variation is
Options- A. 10%
- B. 12.5%
- C. 15%
- D. 18.5 %
- E. 20% Discuss
- 2. The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than
Options- A. 30 minutes
- B. 40 minutes
- C. 60 minutes
- D. 75 minutes
- E. 90 minutes. Discuss
- 3. Joints in concrete structures, are provided
Options- A. to reduce the tensile stresses likely to be developed due to evaporation of water
- B. to minimise the change in the dimensions of the slab
- C. to minimise the necessary cracking
- D. all the above. Discuss
- 4. If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer of 150 litre capacity, is
Options- A. 15, 900 litres
- B. 16, 900 litres
- C. 17, 900 litres
- D. 18, 900 litres Discuss
- 5. The bulk density of aggregates, is generally expressed as
Options- A. tonnes/cubic metre
- B. kg/cubic metre
- C. kg/litre
- D. g/cm3
- E. none of these. Discuss
- 6. Pick up the incorrect statement from the following:
Options- A. Tricalcium silicate (C3S) hydrates rapidly
- B. Tricalcium silicate (C3S) generates more heat of hydration
- C. Tricalcium silicate (C3S) develops early strength
- D. Tricalcium silicate (C3S) has more resistance to sulphate attack
- E. None of these. Discuss
- 7. Sand requiring a high water cement ratio, belongs to
Options- A. Zone I
- B. Zone II
- C. Zone III
- D. Zone IV. Discuss
- 8. An ideal ware house, is provided
Options- A. water proof masonry walls
- B. water proof roof
- C. few windows which remain generally closed
- D. 15 cm thick concrete floor laid on a dry course of soling
- E. all the above. Discuss
- 9. Gypsum is added for
Options- A. colour
- B. strength
- C. controlling setting time
- D. none of these. Discuss
- 10. If the various concrete ingredients i.e. cement, sand and aggregates are in the ratio of 1:3:6, the grade of concrete, is
Options- A. M 100
- B. M 150
- C. M 200
- D. M 250
- E. M 300 Discuss
Concrete Technology problems
Search Results
Correct Answer: 12.5%
Correct Answer: 30 minutes
Correct Answer: all the above.
Correct Answer: 18, 900 litres
Correct Answer: kg/litre
Correct Answer: Tricalcium silicate (C3S) has more resistance to sulphate attack
Correct Answer: Zone I
Correct Answer: all the above.
Correct Answer: controlling setting time
Correct Answer: M 100
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