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The side slope of Cipolletti weir is generally kept
1 to 4
1 to 2
1 to 3
1 : 5
Pick up the incorrect statement from to following regarding triangular notch
None of these.
Only one reading (i.e. H) is required for computation of discharge
For measuring low discharge, it gives more accurate result
Ventilation is necessary
If velocities of fluid particles vary from point to point in magnitude and direction, as well as from instant to instant, the flow is said to be
uniform flow
turbulent flow
laminar
non-uniform flow.
An error of 1% in measuring the head of water over the crest of a rectangular weir, produces an error in the discharge which is equal to
1.25%
1.75%
2.25%
1.5%
Mercury is generally used in barometers because
both (A) and (B) above
both (b) and (c) above.
it is a best liquid
its vaour pressure is practically zero
the height of the barometer will be less
A rectangular channel 6 m wide and 3 m deep and having a bed slope as 1 in 2000 is runningfull.
If Chezy's constant C = 54.8, pick up the correct specification of the channel from the following
hydraulic mean depth = 1.5 m
Rate of flow = 27 m3/sec
All the above.
Velocity of flow = 1.5 m/sec
The flow in a channel is said to be non-uniform, if
All the above.
head needed to overcome frictional resistance is more than the drop in elevation of channel bed
free water surface of an open channel is not parallel to the bed of channel
head needed to overcome frictional reistance is less than the drop in elevation of channel bed
'Flow net' can be drawn only if the flow is
turbulent
None of these.
Distortion
rotational
The value of kinetic energy correction factor
(a) for a laminar flow through a circular pipe, is
l.5
2.0
0.5
1.0
2.5
The ratio of inertia force of a flowing fluid and the viscous force of the liquid is called
Renold's number
Weber's number.
Euler's number
Froude's number
While applying the Bernoulli's equation = total head, the work any section done on the flow system, if any
None of these.
is ignored
is added on the right side of the equation
is added on the left side of the equation
Equation of continuity of flow is based on the principle of conservation of
None of these.
Force
Momentum
mass
Total pressure on the top of a closed cylindrical vessesl completely filled with liquid, is directly proportional to
None of these.
(radius)2
(radius)4
(radius)3
radius
If jet of water coming out from a nozzle with a velocity 9.81 m/s, the angle of elevation being 30°, the time to reach the highest point is
1.0 s
0.50 s
0.25 s
1.5 s.
The discharge over a Cipolletti weir of length 2.185 m when the head over the weir is 1 m, is
2.0 m3
2.5 m3
3.0 m3
4.0 m3.
The instrument used for measuring the velocity of flow, is known as
Venturimeter
Pitot tube
None of these.
Orifice meter
The most efficient channel section, is
Rectangular
half hexagon in the form of trapezoid.
triangular
Semi-circular
Most economical section of a triangular channel, is
Right angled triangle
right angled triangle with equal sides.
isosceles triangle with 45° vertex angle
Equilateral Triangle
For a most economical rectangular channel, the width of the channel must be
twice the depth of flow
equal to depth of flow
half the depth of flow
None of these.
The velocity of the fluid particle at the centre of the pipe section, is
maximum
None of these.
equal throughout
Minimum
1
2
7
13
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