MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Concrete Technology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Reduction in the volume due to shrinkage causes _____ |
| A. | Low volume |
| B. | Volumetric strain |
| C. | Volumetric stress |
| D. | W/c ratio |
| Answer» C. Volumetric stress | |
| 2. |
If there is continuous supply of H2O to the concrete during hydration, concrete expands due to absorption of water by the cement gel. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
Carbonic Acid + Ca(OH)2 ⇨ X. What is the main compound in X? |
| A. | CaCO2 |
| B. | CO2 |
| C. | CaCO3 |
| D. | H2O |
| Answer» D. H2O | |
| 4. |
ACI 305.R.91 specifies Evaporation rate __ kg/hr/m2 should be avoided to prevent plastic cracking. |
| A. | <.5 |
| B. | =0.5 |
| C. | >.5 |
| D. | Not equal to .5 |
| Answer» D. Not equal to .5 | |
| 5. |
IF_THERE_IS_CONTINUOUS_SUPPLY_OF_H2O_TO_THE_CONCRETE_DURING_HYDRATION,_CONCRETE_EXPANDS_DUE_TO_ABSORPTION_OF_WATER_BY_THE_CEMENT_GEL._IS_IT_TRUE_OR_FALSE??$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
Reduction_in_the_volume_due_to_shrinkage_causes______$ |
| A. | Low volume |
| B. | Volumetric strain |
| C. | Volumetric stress |
| D. | W/c ratio |
| Answer» C. Volumetric stress | |
| 7. |
Carbonic Acid + Ca(OH)2 ‚á® X. What is the main compound in X?# |
| A. | CaCO<sub>2</sub> |
| B. | CO<sub>2</sub> |
| C. | CaCO<sub>3</sub> |
| D. | H<sub>2</sub>O |
| Answer» D. H<sub>2</sub>O | |
| 8. |
ACI 305.R.91 specifies Evaporation rate __ kg/hr/m2 should be avoided to prevent plastic cracking. |
| A. | <.5 |
| B. | =0.5 |
| C. | >.5 |
| D. | Not equal to .5 |
| Answer» D. Not equal to .5 | |
| 9. |
What is carbonation shrinkage? |
| A. | It is not a result of any change in the concrete production process. Rather, it is a result of certain environmental conditions which frequently occur in the Central Missouri area |
| B. | It is defined as the contracting of a hardened concrete mixture due to the loss of capillary water. This shrinkage causes an increase in tensile |
| C. | It is an important phenomenon in young concrete. At low w/c ratios, less than about 0.42, all the water is rapidly drawn into the hydration process and the demand for more water creates very fine capillaries |
| D. | It occurs when the concrete is exposed to air containing carbon dioxide |
| Answer» E. | |
| 10. |
What is autogenous shrinkage? |
| A. | It is not a result of any change in the concrete production process. Rather, it is a result of certain environmental conditions which frequently occur in the Central Missouri area |
| B. | It is defined as the contracting of a hardened concrete mixture due to the loss of capillary water. This shrinkage causes an increase in tensile |
| C. | It is an important phenomenon in young concrete. At low w/c ratios, less than about 0.42, all the water is rapidly drawn into the hydration process and the demand for more water creates very fine capillaries |
| D. | It occurs when the concrete is exposed to air containing carbon dioxide |
| Answer» D. It occurs when the concrete is exposed to air containing carbon dioxide | |
| 11. |
What is drying shrinkage? |
| A. | It is not a result of any change in the concrete production process. Rather, it is a result of certain environmental conditions which frequently occur in the Central Missouri area |
| B. | It is defined as the contracting of a hardened concrete mixture due to the loss of capillary water. This shrinkage causes an increase in tensile |
| C. | It is an important phenomenon in young concrete. At low w/c ratios, less than about 0.42, all the water is rapidly drawn into the hydration process and the demand for more water creates very fine capillaries |
| D. | It occurs when the concrete is exposed to air containing carbon dioxide |
| Answer» C. It is an important phenomenon in young concrete. At low w/c ratios, less than about 0.42, all the water is rapidly drawn into the hydration process and the demand for more water creates very fine capillaries | |
| 12. |
How many types of shrinkages, caused due to cooling and carbonation? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 13. |
How many types of shrinkages, caused due to loss of water? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 14. |
What is plastic shrinkage? |
| A. | It is not a result of any change in the concrete production process. Rather, it is a result of certain environmental conditions which occurs in the Central Missouri area |
| B. | It is defined as the contracting of a hardened concrete mixture due to the loss of capillary water. This shrinkage causes an increase in tensile |
| C. | It is an important phenomenon in young concrete. At low w/c ratios, less than about 0.42, all the water is rapidly drawn into the hydration process and the demand for more water creates very fine capillaries |
| D. | It occurs when the concrete is exposed to air containing carbon dioxide |
| Answer» B. It is defined as the contracting of a hardened concrete mixture due to the loss of capillary water. This shrinkage causes an increase in tensile | |