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Irrigation Engineering
Quiz 3
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Q.1
The main cause of meandering is
presence of an excessive bed slope in the river
degradation
the extra turbulence generated by the excess of river sediment during floods
none of the above
Q.2
The width of a dowla is generally kept between 30 to 60 cm and its height above the road level should invariably be more than
10 cm
20 cm
30 cm
40 cm
Q.3
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
Q.4
A river is said to be of
Aggrading type if it builds up its bed to a certain slope
Degrading type if it cuts its bed to a certain slope
Meandering type if it flows in sinuous curve
All the above
Q.5
An artesian aquifer is the one where
water surface under the ground is at atmospheric pressure
water is under pressure between two impervious strata
water table serves as upper surface of zone of saturation
none of the above
Q.6
The kor depth for rice is 190 mm and kor period is 14 days. The outlet factor for this will be
637 hectares/m3/sec
837 hectares/m3/sec
972 hectares/m3/sec
1172 hectares/m3/sec
Q.7
The main function of a diversion head works of a canal from a river, is
To remove silt
To control floods
To store water
To raise water level
Q.8
The amount of irrigation water required to meet the evapotranspiration needs of the crop during its full growth is called
effective rainfall
consumptive use
consumptive irrigation requirement
net irrigation requirement
Q.9
According to Kennedy, the critical velocity (V₀) in meters in a channel is the mean velocity which keeps the channel free from silting or scouring. Its value is given by (where m is critical velocity ratio and D is the depth of the channel).
V₀ = 0.84 mD
0.64
V₀ = 0.55 mD
0.64
V₀ = 0.84 mD
0.54
V₀ = 0.55 mD
0.54
Q.10
The uplift pressure on a dam can be controlled by
i) constructing cutoff under upstream face
ii) constructing drainage channels bet-ween the dam and its foundation
iii) by pressure grouting in foundation
The corret answer is
only (i)
both (i) and (ii)
both (i) and (iii)
(i), (ii) and (iii)
Q.11
If the risk of a flood occurring in the next 10 years is accepted to 10%, then the return period for design should be
1 + (0.9)010
1 – (0.9)°l0
1/(1-0.9°10)
1/(1+ 0.9010)
Q.12
A minimum of 90 cm free board is provided if the discharge in the canal is between
30 to 33 cumecs
30 to 60 cumecs
Over 60 cumecs
Over 100 cumecs
Q.13
If the irrigation efficiency is 80%, conveyance losses are 20% and the actual depth of watering is 16 cm, the depth of water required at the canal outlet, is
10 cm
15 cm
20 cm
25 cm
Q.14
Finally formed berms in canals are provided for
Protection of banks erosion by the waves
Control of seepage losses
Strengthening of banks
All the above
Q.15
Canals constructed for draining off water from water logged areas, are known
Drains
Inundation canals
Valley canals
Contour canals
Q.16
V and R are the regime mean velocity and hydraulic mean depth respectively in meters. Lacey's silt factor f is
2V²/√3 R
3V²/4R
5V²/2R
2V²/5R
Q.17
For a unique design of a channel by Kennedy's theory
Its breadth must only be known
Its depth must only be known
Its breadth and depth ratio must only be known
All the above
Q.18
For wave action in dams, the maximum height of freeboard is generally taken to be equal to (where hw is height of wave.)
0.5 hw
0.75 hw
1.25 hw
1.50 hw
Q.19
The intensity of irrigation means
Percentage of culturable commanded area to be irrigated annually
Percentage of gross commanded area to be irrigated annually
Percentage of the mean of culturable commanded area and the gross commanded area to be irrigated annually
Total depth of water supplied by the number of waterings
Q.20
The width of a meander belt is the transverse distance between
Apex point of one curve and apex point of the reserve curve
Apex point and the crossing
Two banks of meandering river
None of these
Q.21
Pick up the correct statement from the following:
Gravity water is harmful to crops
Hygroscopic water remains attached to soil molecules by chemical bond
Capillary moisture held in the soil pores against gravity by surface tension, is utilized by plants
All the above
Q.22
The ratio of average values of shear stresses produced on the bed and the banks of a channel due to flowing water is
less than 1
equal to 1
greater than 1
equal to zero
Q.23
The difference in level between the top of a bank and supply level in a canal, is called
Berm
Free board
Height of bank
None of these
Q.24
The structure constructed to allow drainage water to flow under pressure through an inverted syphon below a canal, is called
Syphon
Super passage
Super-aqueduct
Syphon aqueduct
Q.25
The downstream expansion head of a guide bank is extended to subtend an angle at the centre, equal to
30°
45°
60°
90°
Q.26
A hydroelectric scheme operating under a head of 80 m will be classified as
low head scheme
medium head scheme
high head scheme
none of the above
Q.27
Irrigation water having the concentration of Na++ , Ca++ and Mg++ as 20, 3 and 1 Milli equivalent per litre respectively will be classified as
low sodium water
medium sodium water
high sodium water
very high sodium water
Q.28
If d1 is the depth of cutting, d2 is the height of the bank from bed level r2 : 1 and r1 : 1 are the slopes in filling and cutting respectively, the horizontal distance n between the bed and bank, is
x = r1 d1
x = r2 d2
x = d1 / r1
x = d2 / r2
Q.29
For smooth entry of water in a canal, the angle between head regulator and water is generally kept
80°
90°
110°
120°
Q.30
For a catchment area of 120 km2, the equilibrium discharge in m3/hour of an S-curve obtained by the summation of 6 hour unit hydro graph is
0.2 x 106
0.6 x 106
2.4 xlO6
7.2 xlO6
0 h : 0 m : 1 s
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