Concrete Technology problems
- 1. Pick up the incorrect statement from the following:
Options- A. Space between the exterior walls of a warechouse and bag piles should be 30 cm
- B. Cement bags should preferably be piled on wooden planks
- C. Cement bags should be placed such that bags of one layer does not touch the bags of the adjacent layer
- D. Width and height of the pile should not exceed 3 m and 2.70 m respectively
- E. None of these. Discuss
Correct Answer: None of these.
- 2. If 50 kg of fine aggregates and 100 kg of coarse agregates are mixed in a concrete whose water cement ratio is 0.6, the weight of water required for harsh mix, is
Options- A. 8 kg
- B. 10 kg
- C. 12 kg
- D. 14 kg
- E. 15 kg. Discuss
Correct Answer: 12 kg
- 3. Pick up the correct statement from the following:
Options- A. There should not be any loss of cement from the charged drum of the mixer
- B. Cement should be mixed for at least one minute
- C. 10% of water is placed in the rotating drum before adding dry material
- D. 10% of water is added after placing the other ingredients in the drum
- E. All the above. Discuss
Correct Answer: All the above.
- 4. The strength and quality of concrete, depend upon:
Options- A. grading of aggregates
- B. surface area of aggregates
- C. shape of aggregates
- D. surface texture of aggregates
- E. all the above. Discuss
Correct Answer: all the above.
- 5. Inert material of a cement concrete mix, is
Options- A. water
- B. cement
- C. aggregate
- D. none of these. Discuss
Correct Answer: aggregate
- 6. Pick up the correct statement from the following:
Options- A. Construction joints in columns are provided a few cm below the junction of beam
- B. Construction joints in columns are provided at the bottom haunching
- C. Construction joints in beams and slabs are provided within middel third
- D. Constructionjoints are generally provided in positions subjected to least shear force
- E. All the above. Discuss
Correct Answer: All the above.
- 7. Horizontal construction joints in concrete walls are generally provided at
Options- A. soffit level
- B. window sill level
- C. floor level
- D. all the above. Discuss
Correct Answer: all the above.
- 8. An excess of flaky particles in concrete aggregates
Options- A. decreases the workability
- B. increases the quantity of water and sand
- C. affects the durability of concrete
- D. more than 15% are not desirable
- E. all the above. Discuss
Correct Answer: all the above.
- 9. An aggregate is known as cyclopean aggregate if its size is more than
Options- A. 4.75 mm
- B. 30 mm
- C. 60 mm
- D. 75 mm
- E. 90 mm. Discuss
Correct Answer: 75 mm
- 10. In the method of voids for determination of the quantity of cement paste, it is assumed that
Options- A. Voids in coarse aggregates are filled by fine aggregates
- B. Voids in fine aggregates are filled by the cement paste
- C. Volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra
- D. Volume of cement paste required is equal to total volume of voids in fine aggregates plus 15% extra
- E. All the above. Discuss
Correct Answer: All the above.
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