free Model Online Irrigation,Water Resources Engineering and Hydrology Test2

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1. For wave action in dams, the maximum height of freeboard is generally taken to be equal to _____.
0.5 hw	0.75 hw
1.25 hw	1.50 hw

2. As compared to gravity dams, earthen dams
are costlier	are less susceptible to failure
require sound rock foundations	require less skilled labour

3. The most suitable material for the central impervious core of a zoned embankment type dam is _____.
clay	coarse sand
silty clay	clay mixed with fine sand

4. Seepage through embankments in an earthen dam is controlled by ______.
drainage filters	relief wells
drain trenches	provision of downstream berms

5. Seepage through foundation in an earthen dam is controlled by providing _____.
rock toe	horizontal blanket
impervious cut off	chimney drain

6. The flow of water after spilling over the weir crest in chute spillway and side channel spillway respectively are _____.
at right angle and parallel to weir crest	parallel and at right angle to weir crest
parallel to weir crest in both	at right angle to weir crest in both

7. The discharge passing over an ogee spillway is given by ______.
CLH3/2	CHL3/2
CLH5/2	CLH1/2

8. Coefficient of discharge of an ogee spillway
depends on depth of approach and upstream slope	depends on downstream apron interference and downstream submergence
remains constant	both (a) and (b)

9. Which of the following spillways is least suitable for an earthen dam ?
ogee spillway	chute spillway
side channel spillway	shaft spillway

10. In case of non-availability of space due to topography, the most suitable spillway is _____.
straight drop spillway	shaft spillway
chute spillway	ogee spillway

11. In a chute spillway, the flow is usually ______.
uniform	subcritical
critical	super critical

12. For the upstream face of an earthen dam, the most adverse condition for stability of slope is _____.
sudden drawdown	steady seepage
during construction	sloughing of slope

13. If there are two canals taking off from each flank of a river, then there will be _____.
one divide wall and one undersluice	one divide wall and two undersluices
two divide walls and one undersluice	two divide walls and two undersluices

14. Generally the weir is aligned at right angles to the direction of the main river current because
it ensures less length of the weir	it gives better discharging capacity
it is economical	all of the above

15. The main function of a divide wall is to _____.
control the silt entry in the canal	prevent river floods from entering the canal
separate the undersluices from weir proper	provide smooth flow at sufficiently low velocity

16. A divide wall is provided
at right angle to the axis of weir	parallel to the axis of weir and up-stream of it
parallel to the axis of weir and down-stream of it	at an inclination to the axis of weir

17. As compared to crest of the normal portion of the weir, the crest of the undersluice portion of weir is kept at
lower level	higher level
same level	any of the above depending on the design

18. Silt ex-cluders are constructed on the
river bed upstream of head regulator	river bed downstream of head regulator
canal bed upstream of head regulator	canal bed downstream of head regulator

19. According to Khosla's theory, the exit gradient in the absence of a downstream cutoff is _____.
0	unity
infinity	very large

20. The minimum size of stone that will remain at rest in a channel of longitudinal slope S and hydraulic mean depth R is given by _____.
4 RS	11 RS
7 RS	15 RS