As compared to gravity dams, earthen dams__________________?

Related Mcqs:

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

   A. rock toe
   B. horizontal blanket
   C. impervious cut off
   D. chimney drain

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

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

5. For wave action in dams, the maximum height of freeboard is generally taken to be equal to_______________?

   A. 0.5 hw
   B. 0.75 hw
   C. 1.25 hw
   D. 1.50 hw

   where hw is height of wave

6. When the upstream face of a gravity dam is vertical, then the intensity of water pressure at the water surface and at the base respectively will be_______________?

   A. 0 and wH212
   B. wH2/2and wH2/3
   C. wH and 0
   D. OandwII

   where w is unit weight of water and H is the depth of water

7. 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

8. The major resisting force in a gravity dam is___________________?

   A. water pressure
   B. wave pressure
   C. self-weight of dam
   D. uplift pressure

9. 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)

10. Presence of tail water in a gravity dam_____________?

    1) increases the principal stress
    2) decreases the principal stress
    3) increases the shear stress
    4) decreases the shear stress
    The correct answer is

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