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Design of Concrete Structures-Data Intensity 2 Multiple Questions and Answers.
| 1. | Increase in the moisture content in concrete______? | ||
| A. | reduces the strength | ||
| B. | increases the strength | ||
| C. | does not change the strength | ||
| D. | all of the above | ||
| 2. | The relation between modulus of rupturefcr and characteristic strength of concrete fck is given by___? | ||
| A. | fcr=0.35Vf7 | ||
| B. | fcr=0.57f7 | ||
| C. | fcr=0.7Vf7 | ||
| D. | fcr=1.2Vf7 | ||
| 3. | The approximate value of the ratio between direct tensile strength and flexural strength is__? | ||
| A. | 0.33 | ||
| B. | 0.5 | ||
| C. | 0.75 | ||
| D. | 1 | ||
| 4. | Air entrainment in the concrete increases_______? | ||
| A. | workability | ||
| B. | strength | ||
| C. | the effects of temperature variations | ||
| D. | the unit weight | ||
| 5. | Workability of concrete is inversely pro¬portional to___? | ||
| A. | time of transit | ||
| B. | vater-cement ratio | ||
| C. | the air in the mix | ||
| D. | size of aggregate | ||
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