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

Related Mcqs:

1. 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

2. For a flood control reservoir, the effective storage is equal to_______________?

   A. useful storage – valley storage
   B. useful storage + surcharge storage
   C. useful storage + surcharge storage + valley storage
   D. useful storage + surcharge storage -valley storage

3. If D is the depth of scour below original bed, then the width of launching apron is generally taken as________________?

   A. 1.2 D
   B. 1.5 D
   C. 2.0 D
   D. 2.5 D

4. The maximum rainfall depth of 300 mm in 24 hours has a return period of 100 years. The probability of 24 hours rainfall equal to or greater than 300 mm occurring at least once in 10 years is given by_____________?

   A. (0.99)10
   B. 1 – (0.99)10
   C. (0.9)’00
   D. l-(0.9)100

5. The maximum average depth due to one day storm over an area of 100 km2 is 100 mm. Depth-Area-Duration (DAD. curves indicate that for the same area of 100 km2 the maximum average depth for a 3 hour storm will be__________________?

   A. 100 mm
   B. more than 100 mm
   C. less than 100 mm
   D. none of the above

6. The main function of a divide wall is to_______________?

   A. control the silt entry in the canal
   B. prevent river floods from entering the canal
   C. separate the undersluices from weir proper
   D. provide smooth flow at sufficiently low velocity

7. Interception losses are due to_______________?

   1) evaporation
   2) transpiration
   3) stream flow
   The correct answer is?

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

8. 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

9. Hydrodynamic pressure due to earthquake acts at a height of_________________?

   A. 3H/47I above the base
   B. 3H747t below the water surface
   C. 4H/371 above the base
   D. 4H737t below the water surface where H is the depth of water

10. Vertical drop fall is satisfactory for a height upto ___________?

    A. 0.5 m
    B. 1.5 m
    C. 3.5 m
    D. 5.0 m