MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Irrigation Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If the uplift increases and the net effective downward force reduces, the resultant will shift towards the toe. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
The governing compressive stress in a concrete gravity dam which should not be allowed to exceed the permissible value of about 3000 KN/m2 while analyzing full reservoir case is ____________________ |
| A. | the vertical maximum stress at the toe |
| B. | the major principal stress at toe |
| C. | the shear stress at the toe |
| D. | the principal stress at the heel |
| Answer» C. the shear stress at the toe | |
| 3. |
The bottom portion of a concrete or a masonry gravity dam is usually stepped in order to _______ |
| A. | increase the overturning resistance of the dam |
| B. | increase the shear strength |
| C. | decrease the shear strength |
| D. | increase the frictional resistance |
| Answer» C. decrease the shear strength | |
| 4. |
Which of the following criteria has to be satisfied for no tension at any point on a gravity dam? |
| A. | The resultant of all the forces must always pass through the mid-point of the base of the dam |
| B. | The resultant force for all conditions of loading must pass through the middle third of the base |
| C. | The resultant of all the forces must pass through the upstream extremity of the middle third of the base |
| D. | The resultant of all the forces must pass through the downstream extremity of the middle third of the base |
| Answer» C. The resultant of all the forces must pass through the upstream extremity of the middle third of the base | |
| 5. |
The major principal stress at the toe of a gravity dam under full reservoir condition neglecting the tailwater effect is given by ____________________ |
| A. | P<sub>v</sub> |
| B. | P<sub>v</sub> tanQ<sup>2</sup> |
| C. | P<sub>v</sub> secQ<sup>2</sup> |
| D. | P<sub>v</sub> sinQ<sup>2</sup> |
| Answer» D. P<sub>v</sub> sinQ<sup>2</sup> | |
| 6. |
Tension cracks in the dam may sometimes lead to the failure of the structure by? |
| A. | Sliding of the dam at the cracked section |
| B. | Overturning about the toe |
| C. | Crushing of concrete starting from the toe |
| D. | Both overturning and crushing |
| Answer» D. Both overturning and crushing | |
| 7. |
Which failure occurs when the minimum stress exceeds the allowable compressive stress of the dam material? |
| A. | Overturning |
| B. | Crushing |
| C. | Sliding |
| D. | By development of tension |
| Answer» C. Sliding | |
| 8. |
Which failure occurs when the net horizontal force above any plane in the dam or at the base of the dam exceeds the frictional resistance developed at that level? |
| A. | Overturning |
| B. | Crushing |
| C. | Sliding |
| D. | BY development of tension |
| Answer» D. BY development of tension | |
| 9. |
What is the maximum permissible tensile stress for high concrete gravity dam under worst conditions? |
| A. | 500 KN/m<sup>2</sup> |
| B. | 500 kg/cm<sup>2</sup> |
| C. | 5 kg/m<sup>2</sup> |
| D. | 50 KN/m<sup>2</sup> |
| Answer» B. 500 kg/cm<sup>2</sup> | |
| 10. |
The factor of safety against overturning generally varies between ___________ |
| A. | 2 to 3 |
| B. | 1.5 to 2 |
| C. | 0.5 to 1.5 |
| D. | 1 to 2 |
| Answer» B. 1.5 to 2 | |