Seepage through foundation in an earthen dam is controlled by providing___________________?

Related Mcqs:

1. Seepage through embankments in an earthen dam is controlled by_______________?

   A. drainage filters
   B. relief wells
   C. drain trenches
   D. provision of downstream berms

2. Which of the following spillways is least suitable for an earthen dam ?

   A. ogee spillway
   B. chute spillway
   C. side channel spillway
   D. shaft spillway

3. For the upstream face of an earthen dam, the most adverse condition for stability of slope is_______________?

   A. sudden drawdown
   B. steady seepage
   C. during construction
   D. sloughing of slope

4. As compared to gravity dams, earthen dams__________________?

   A. are costlier
   B. are less susceptible to failure
   C. require sound rock foundations
   D. require less skilled labour

5. The uplift pressure on a dam can be controlled by_________________?

   1) constructing cutoff under upstream face
   2) constructing drainage channels bet-ween the dam and its foundation
   3) by pressure grouting in foundation
   The corret answer is?
   A. only (1)
   B. both (1) and (2)
   C. both (1) and (3)
   D. (1), (2) and (3)

6. The uplift pressure on the face of a drainage gallery in a dam is taken as_________________?

   A. hydrostatic pressure at toe
   B. average of hydrostatic pressure at toe and heel
   C. two-third of hydrostatic pressure at toe plus one-third of hydrostatic pressure at heel
   D. none of the above

7. When the reservoir is full, the maximum compressive force in a gravity dam is produced______________?

   A. at the toe
   B. at the heel
   C. within the middle third of base
   D. at centre of base

8. The most suitable material for the central impervious core of a zoned embankment type dam is_______________?

   A. clay
   B. coarse sand
   C. silty clay
   D. clay mixed with fine sand

9. The maximum permissible eccentricity for no tension at the base of a gravity dam is__________________?

   A. B/2
   B. B/3
   C. B/4
   D. B/6

10. The forces, which are considered for the analysis of an elementary profile of a gravity dam under empty reservoir condition, are________________?

    1) Water pressure
    2) Self weight
    3) Uplift
    4) Pressure due to earthquake
    The correct answer is

    A. Only (2)
    B. (1), (2) and (3)
    C. (1), (2) and (4)
    D. (1), (2), (3) and (4)