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Quiz 6
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Q.1
The forces, which are considered for the analysis of an elementary profile of a gravity dam under empty reservoir condition, are
i) Water pressure
ii) Self weight
iii) Uplift
iv) Pressure due to earthquake
The correct answer is
Only (ii)
(i), (ii) and (iii)
(i), (ii) and (iv)
(i), (ii), (iii) and (iv)
Q.2
If straight sides of a triangular section of a lined canal with circular bottom of radius R, make an angle θ with horizontal, the area of its cross-section, is
R (θ + tan θ)
R (θ + cot θ)
R2 (θ + tan θ)
R2 (θ + cot θ)
Q.3
If D₁ and D₂ are depths of water upstream and downstream of a hydraulic jump, the loss of head at the jump, is
(D₂ - D₁)3/D₁D₂
(D₂ - D₁)3/2D₁D₂
(D₂ - D₁)3/3D₁D₂
(D₂ - D₁)3/4D₁D₂
Q.4
For the design of major hydraulic structures on the canals, the method generally preferred to, is based on
Bligh's theory
Electrical analogy method
The relaxation method
Khosla's method of independent variables
Q.5
According to G.W. Pickles the effect of confining the flood water of a river between levee, is to increase
Rate of flood wave
Water surface elevation during floods
Maximum discharge
Surface slope of streams above the levied portion
Q.6
The unit hydrograph of a specified duration can be used to evaluate the hydrograph of storms of
same duration only
same and shorter duration
same and longer duration
any duration
Q.7
Which of the following is a non-recording raingauge ?
tipping bucket type raingauge
Simon’s raingauge
Steven’s weighing type raingauge
floating type raingauge
Q.8
Pick up the correct statement from the following
Approach of the water line in a flumed channel section should not be steeper than 22½°
Departure of the water line from a flumed channel section should not be steeper than 30°
Approach of the water line should not be steeper than 30° and departure line not steeper than 22½° in a flumed channel section
Approach and departure of the water line in a flumed channel section, should not be steeper than 22½°
Q.9
The sinuosity of a meander is the ratio of
Meander length and the width of meander
Meander length and half width of the river
Curved length and the straight distance
None of these
Q.10
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
Q.11
Disposal of extra excavated earth of canals, is utilized to provide a spoil bank on
Left side
Right side
Both sides
All the above
Q.12
The duty is largest
at the head of water course
on the field
at the head of a main canal
same at all places
Q.13
In India, which of the following is adopted as standard recording rain-gauge?
Symon’s rain-gauge
Tipping bucket type
Natural siphon type
Weighing bucket type
Q.14
According to Lacey, in regime conditions
Silt is kept in suspension by vertical components of eddies
Entire cross-section of the channel is generated at all points by the forces normal to the wetted perimeter
Both (A) and (B)
Neither (A) nor (B)
Q.15
The flow-mass curve is graphical representation of
Cumulative discharge and time
Discharge and percentage probability of flow being equaled or exceeded
Cumulative discharge, volume and time in chronological order
Discharge and time in chronological order
Q.16
If the straight sides of a triangular section of a lined canal with circular bottom of radius R, make an angle θ with horizontal, the perimeter of the canal is
R (θ + tan θ)
2R (θ + tan θ)
R (θ + cos θ)
2R (θ + cos θ)
Q.17
An aggrading river is a
silting river
scouring river
both silting and scouring river
neither silting nor scouring river
Q.18
The shape of recession limb of a hydrograph depends upon
Basin characteristics only
Storm characteristics only
Both (A) and (B)
None of the above
Q.19
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
4RS
11RS
7RS
15 RS
Q.20
The optimum depth of kor watering for a rice crop, is
23.0 cm
19.0 cm
17.5 cm
13.5 cm
Q.21
Select the incorrect statement.
Intensive irrigation should be avoided in areas susceptible to water logging
Extensive irrigation should be adopted in areas susceptible to water logging
Lift irrigation increases water logging
All of the above
Q.22
A hyetograph is a graphical representation of
rainfall intensity and time
rainfall depth and time
discharge and time
cumulative rainfall and time
Q.23
Hydrograph is the graphical representation of
runoff and time
surface runoff and time
ground waterflow and time
rainfall and time
Q.24
Silt excluders 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
Q.25
In Montague type fall
A straight glacis is provided
A circular glacis is provided
A parabolic glacis is provided
No glacis is provided
Q.26
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
Q.27
In a Sarda type fall, the rectangular crest, may be used for discharge up to
6 cumecs
10 cumecs
14 cumecs
20 cumecs
Q.28
The meander pattern of a river is developed by
Average discharge
Dominant discharge
Maximum discharge
Critical discharge
Q.29
When surface of transpiration is submerged under water, then potential evapotranspiration is
much more than evapotranspiration
much less than evapotranspiration
equal to evapotranspiration
equal to or less than evapotranspi-ration
Q.30
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
100 mm
more than 100 mm
less than 100 mm
none of the above
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