Concrete Technology problems
- 1. The type of aggregates of same nominal size, which contain less voids when compacted, are
Options- A. rounded spherical
- B. irregular
- C. flaky
- D. none of these. Discuss
Correct Answer: rounded spherical
- 2. The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is
Options- A. 100 kg/cm2
- B. 150 kg/cm2
- C. 200 kg/cm2
- D. 250 kg/cm2
- E. 300 kg/cm2 Discuss
Correct Answer: 150 kg/cm2
- 3. Slump test of concrete is a meausre ofits
Options- A. consistency
- B. compressive strength
- C. tensile strength
- D. impact value. Discuss
Correct Answer: consistency
- 4. 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
Correct Answer: kg/litre
- 5. 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
Correct Answer: 18, 900 litres
- 6. 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
Correct Answer: all the above.
- 7. 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
Correct Answer: 30 minutes
- 8. 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
Correct Answer: 12.5%
- 9. Ordinary Portland cement is manufactured from
Options- A. lime stone and clay
- B. gypsum and lime
- C. pozzolana
- D. lime, pozzolana and clay. Discuss
Correct Answer: gypsum and lime
- 10. 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
Correct Answer: Tricalcium silicate (C3S) has more resistance to sulphate attack
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