Concrete Technology problems
- 1. The factor which affects workability, is
Options- A. water content and its temperature
- B. shape and size of the aggregates
- C. grading and surface textures of the aggregates
- D. air entraining agents
- E. all the above. Discuss
Correct Answer: all the above.
- 2. To hydrate 500kg of cement full water needed, is
Options- A. 100 kg
- B. 110 kg
- C. 120 kg
- D. 130 kg
- E. 140 kg Discuss
Correct Answer: 130 kg
- 3. Pick up the incorrect statemnt from the following. For performing compressive strength test of cement
Options- A. cement and standard sand mortar are used in the ratio of 1 : 3
- B. water is added at the rate of
+ 3.0 percentage of water where P is the percentage of water for standard consistency - C. A cube mould of 10 cm x 10 cm x 10 cm is used
- D. The perpared moulds are kept in a atmosphere of 50% relative humidity
- E. The temperature of water in the submerged tank for curing moulds, should be 27° ± 2°C. Discuss
Correct Answer: cement and standard sand mortar are used in the ratio of 1 : 3
- 4. To obtain a very high strength concrete, use very fine grained
Options- A. Granite
- B. Magnetite
- C. Barite
- D. Volcanic scoria. Discuss
Correct Answer: Granite
- 5. Separation of water or water sand cement from a freshly concrete, is known
Options- A. bleeding
- B. creeping
- C. segregation
- D. flooding
- E. none of these. Discuss
Correct Answer: bleeding
- 6. An ordinary Portland cement when tested for its fineness, should not leave any residue on I.S. seive No. 9, more than
Options- A. 5%
- B. 10%
- C. 15%
- D. 20%
- E. 25% Discuss
Correct Answer: 10%
- 7. Workability of concrete mix with low water cement ratio is determined by
Options- A. tensile strength test
- B. slump test
- C. compaction factor test
- D. flexural strength test
- E. none of these. Discuss
Correct Answer: compaction factor test
- 8. Water cement ratio is
Options- A. volume of water to that of cement
- B. weight of water to that of cement
- C. weight of concrete to that of water
- D. volume of concrete to that of water
- E. both (a) and (b) of the above. Discuss
Correct Answer: both (a) and (b) of the above.
- 9. For the construction of cement con-certe dams, the maximum permissible size of the aggregates, is
Options- A. 40 mm
- B. 50 mm
- C. 60 mm
- D. 70 mm
- E. 80 mm Discuss
Correct Answer: 40 mm
- 10. Permissible compressive strength of M 150 concrete grade 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
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