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Quiz 7
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Q.1
When a canal flowing under pressure is carried below a natural drainage such that its F.S.L. does not touch the underside of the supporting structure, the structure so provided, is called
Syphon
Aqueduct
Super passage
Syphon-aqueduct
Q.2
If the optimum depth of kor watering for a crop is 15.12 cm, the outlet factor for the crop for four week period in hectares per cumec, is
1000
1200
1400
1600
Q.3
Pick up the correct statement from the following
In a level crossing, a crest with its top at the canal F.S.L. is provided across the drainage at its up-stream junction with canal
In a level crossing a regulator is provided across the drainage at its down-stream
In a level crossing, a cross regulator is provided on the canal below the crossing
All the above
Q.4
The useful storage is the volume of water stored in the reservoir between
minimum pool level and maximum pool level
minimum pool level and normal pool level
normal pool level and maximum pool level
river bed and minimum pool level
Q.5
For a flood control reservoir, the effective storage is equal to
useful storage – valley storage
useful storage + surcharge storage
useful storage + surcharge storage + valley storage
useful storage + surcharge storage -valley storage
Q.6
The crest level of a canal diversion head work, depends upon
F.S.L. of the canal
Discharge perimeters
Pond level
All the above
Q.7
Select the correct statement.
A meander increases the river length but a cut off reduces the river length
A cut-off increases the river length but a meander reduces the river length
Both meander and cut-off increase the river length
Both meander and cut-off decrease the river length
Q.8
Pick up the correct statement from the following:
Water table generally follows the ground surface above it with a few exceptions
Static level of water in an open well indicates the position of the water table
At water table, hydrostatic pressure is zero
All the above
Q.9
Lacy's regime condition is obtained if
Silt grade in the channel is variable
Discharge in the channel is variable
Silt charge in the channel is variable
Channel flows in unlimited, incoherent alluvium of the same character as that transported material
Q.10
Infiltration rate is always
more than the infiltration capacity
less than the infiltration capacity
equal to or less than the infiltration capacity
equal to or more than the infiltration capacity
Q.11
In a canal syphon, the flow is
Under atmospheric pressure
Pipe flow
With critical velocity
Under negative pressure
Q.12
Regime conditions in a channel may occur if
Discharge is constant
Channel flows uniformly in incoherent alluvium as that transported in suspension
Silt grade and silt charge are constant
All the above
Q.13
The ratio of the rate of change of discharge of an outlet and parent channel, is known as
Efficiency
Sensitivity
Flexibility
Modular limit
Q.14
Which of the following methods of applying water may be used on rolling land ?
boarder flooding
check flooding
furrow flooding
free flooding
Q.15
Garnett's diagrams are used for graphical solution of design equations of a canal by
Lacey's theory
Kennedy's theory
Gibb's theory
Lindlay theory
Q.16
The aqueduct or superpassage type of works are generally used when
high flood drainage discharge is small
high flood drainage discharge is large and short lived
high flood drainage discharge is large and continues for a long time
none of the above
Q.17
The most suitable chemical which can be applied to the water surface for reducing evaporation is
Methyl alcohol
Ethyl alcohol
Cetyl alcohol
Butyl alcohol
Q.18
According to Lacey, depth of scour in a river depends upon the straightness of the reach. If D is the depth of scour in regime flow in a right angled bend, it is
1.25 D
1.50 D
1.75 D
2.00 D
Q.19
Dimensions of coefficient of transmissibility are
M°L°T°
rvfL’T”1
M° L2 T1
M’LV
Q.20
According to Khosla’s theory, the exit gradient in the absence of a downstream cutoff is
0
unity
infinity
very large
Q.21
For cereal crops the most commonly adopted method of irrigation, is
Free flowing method
Check method
Furrow method
Sprinkling method
Q.22
The best unit duration of storm for a unit hydrograph is
1 hour
one-fourth of basin lag
one-half of basin lag
equal to basin lag
Q.23
S-hydrograph is used to obtain unit hydrograph of
shorter duration from longer duration
longer duration from shorter duration
both (A) and (B)
none of the above
Q.24
For standing crops in undulating sandy fields, the best method of irrigation, is
Sprinkler irrigation
Free flooding
Check method
Furrow method
Q.25
The unit hydrograph due to a storm may be obtained by dividing the ordinates of the direct runoff hydrograph by
direct runoff volume
period of storm
total rainfall
none of the above
Q.26
Side slopes generally kept for canals in loam soil, are:
1 : 1 in cutting and 1½ : 1 in filling
1½ : 1 in cutting and 2 : 1 in filling
Neither (A) nor (B)
Both (A) and (B)
Q.27
If the R.L’s of canal bed level and high flood level of drainage are 212.0 m and 210.0 m respectively, then cross drainage work will be
aqueduct
superpassage
syphon
syphon aqueduct
Q.28
The most suitable location of a canal head work, is
Delta stage of the river
Boulders stage of the river
Rock stage of the river
Trough stage of the river
Q.29
Pick up the incorrect statement from the following:
In free flooding irrigation, water is admitted at one corner of a field and is allowed to spread over the entire area
In check method of irrigation, the field is divided into smaller compartments and water is admitted to each in turn
In furrow irrigation water is admitted between the rows of plants in the field
None of these
Q.30
A deficit of sediments in flowing water may cause a river
Meandering type
Aggrading type
Degrading type
Sub-critical type
0 h : 0 m : 1 s
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