Quiz on Unit 3

1. Which of the following earth dam is suitable only on impervious foundation?

• Zoned embankment type

• Homogenous embankment type

• Non-homogenous type

• Diaphragm type

2. Which of the following zone in Zoned type embankment prevents piping through cracks?

• Central core

• Transition zone

• Outer zone

• Core wall

3. Which embankment has the thickness of the diaphragm at an elevation less than 10 meters or the height of the embankment above the corresponding elevation?

• Diaphragm type dam

• Zoned type dam

• Non-homogenous earth dam

• Homogenous earth dam

4. The blanket in earth dam is provided ___________________

• at the ground level on u/s side

• at the ground level on the d/s side

• at the ground level of the D/s side of the dam

• on the D/s slope

5. Which of the following statement is correct with reference to earthen dams?

• These dams are very costly as compared to other types

• Gravity dams are less susceptible to failure as compared to rigid dams

• These dams are suitable for construction on almost every type of foundation

• Highly skilled labor is generally not required

6. During the construction of an earthen dam by hydraulic fill method, development of pore pressure becomes important in the ________

• central impervious core

• pervious outer shell

• transition zone

• both central core and outer shell

7. The process of laying and compacting earth in layers by power rollers under OMC for construction of earthen dams is known as ______________________

• Rolled fill method

• Hydraulic fill method

• OMC method

• Compaction

8. The central core of the zoned embankment type earth dam ___________

• checks the seepage

• prevents piping

• gives stability to the central impervious fill

• distribute the load over a large area

9. Which type of dam is suitable on shallow pervious foundations?

• Zoned embankment type

• Homogenous embankment type

• Both Non-homogenous type and homogenous type

• Diaphragm type

10. What is the U.S.B.R recommended value for freeboard when the height of the dam is more than 60 m?

• 2 m to 3 m

• 2.5 m above the top of gates

• 3 m above the top of gates

• More than 3 m