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) -
R(θ + tan θ)
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.
If average particle size of the silt in millimetres is m, the Lacey's silt factor f is proportional to
-
m -
m3 -
m1/2 -
m1/3 -
m2/3
If the irrigation efficiency is 80%, conveyance losses areand the actual depth of watering iscm, the depth of water required at the canal outlet, is
-
10 cm -
15 cm -
20 cm -
25 cm -
30 cm
The most suitable location of a canal head work, is
-
boulders stage of the river -
delta stage of the river -
rock stage of the river -
trough stage of the river.
The down stream expansion head of a guide bank is extended to subtend an angle at the centre, equal to
-
30° -
45° -
60° -
90°
A minimum ofcm 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
According to Bligh's creep theory, percolating water flows along
-
straight path under the foundation of the dam -
circular path under the foundation of the dam -
the outline of the base of the foundation of the dam -
none of these.
A hydraulic jump is generally formed when a stream moving with
-
a hyper-critical velocity meets a stream moving with a critical velocity -
a hyper-critical velocity meets a stream moving with a hyper-critical velocity -
A hyper-critical velocity meets a stream moving with a sub-critical velocity -
a sub-critical velocity meets a stream moving with a hyper-critical velocity.
In Montague type fall
-
a straight glacis is provided -
a circular glacis is provided -
a parabolic glacis is provided -
no glacis is provided.
In gravity canals, F.S.L. is
-
always at the ground level -
always below the ground level -
generally 4 to 5 metres above the ground level -
only a few cm above the ground level.
Lane's weighted creep theory assumes
-
equal weightage to horizontal and vertical creeps -
double weightage to horizontal creep and one weightage to vertical creep -
triple weightage to horizontal creep and one weightage to vertical creep -
triple weightage to vertical creep and one weightage to horizontal creep -
double weightage to vertical creep and one weightage to horizontal creep.
The most suitable location of a canal head work, is
-
boulders stage of the river -
delta stage of the river -
rock stage of the river -
trough stage of the river.
For a unique design of a channel by Kennedy's theory
-
its depth must only be known -
its breadth must only be known -
its breadth and depth ratio must only be known -
all the above.
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
Meandering of a river generally occurs, in
-
rocky stage -
delta stage -
boulder stage -
trough stage.
Disposal of extra excavated earth of canals, is utilised to provide a spoil bank on
-
left side -
right side -
both sides -
all the above.
The down stream expansion head of a guide bank is extended to subtend an angle at the centre, equal to
-
30° -
45° -
60° -
90°
The structure constructed to allow drainage water to flow under pressure through an inverted syphon below a canal, is called
-
syphon -
super passage -
aqueduct -
super-aqueduct -
syphon aqueduct.
The consumptive use of water for a crop
-
is measured as the volume of water per unit area -
is measured as depth of water on irrigated area -
may be supplied partly by precipitation and partly by irrigation -
all the above.
If A is the area of the surface, x is the depth of its C.G. from the surface of the water and ω is the density of water, then
-
total pressure on the surface is equal to ω x -
depth of the point at which total pressure acts is equal to its moment of inertia divided by A x -
depth of the centre of pressure is 2/3H vertically below the surface -
all the above.
The down stream expansion head of a guide bank is extended to subtend an angle at the centre, equal to
-
30° -
45° -
60° -
90°
Solution of Laplacian equation in three dimensions 
of water in a syphon, is done by
-
analytical method -
Khosla's method -
method of relaxation -
Unwin's method.
The consumptive use of water for a crop
-
is measured as the volume of water per unit area -
is measured as depth of water on irrigated area -
may be supplied partly by precipitation and partly by irrigation -
all the above.
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.
Pick up the correct sequence of the part of a canal system from the following
-
Head work-distributary-branch canal-minor -
Head works-main canal-branch canal-dis-tributary-minor -
Head works-main canal-branch canal-minor-distributary -
Heads works-branch canal-main canal distributary, minor.
F.S.L. of a canal at its head with respect to parent channel is kept
-
at the same level -
15 cm lower -
15 cm higher -
none of these.
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.
A counter berm is
-
a horizontal benching provided on the inside slope -
a horizontal benching provided on the outside slope -
a vertical benching provided on the outer edge of the bank -
a vertical benching provided on the inner edge of the bank.
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).