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
-
laminar -
turbulent flow -
uniform flow -
non-uniform flow.
To avoid vapourisation, pipe lines are laid over the ridge so that these are above the hydraulic gradient line, not more than
-
2.4 m -
6.4 m -
10.0 m -
5.0 m.
The best side slope for most economical trapezoidal section, is
-
30° -
45° -
60° -
None of these.
An orifice is taken as large if
-
(H2 - H1) > H -
(H2 - H1) > H/4 -
(H2 - H1) > H/2 -
(H2 - H1) > H/3
The continuity equation
-
expresses the relationship between work and energy -
relates the momentum per unit volume between two points on a stream line -
relates mass rate of flow along a stream line -
requires that Newton's second law of motion be satisfied at every point in fluid.
For a most economical rectangular channel, the hydraulic mean depth, is equal to
-
the depth of flow -
half the depth of flow -
one-third depth of flow -
None of these.
The height of water level in a tank above the centre of a circular hole 2.5 cm in diameter ism. The velocity of water flowing through the hole, is
-
31.1 m/sec -
31.2 m/sec -
31.3 m/sec -
31.4 m/sec.
In fluids, steady flow occurs when
-
conditions of flow change steadily with time -
conditions of flow do not change with time at a point -
conditions of flow remain the same at adjacent point -
velocity vector remains constant at a point.
The rise of the liquid along the walls of a revolving cylinder above the initial level, is
-
greater than the depression of the liquid at the axis of rotation -
lesser than the depression of the liquid at the axis of rotation -
the same as the depression of the liquid at the axis of rotation -
none of these.
A jet projected at an angle of 45θ,m from the foot of a vertical column, just reaches the top of the column. The height of the column is
-
15 m -
20 m -
30 m -
40 m -
60 m.
The following is not a laminar flow
-
Flow of oil in measuring instruments -
Flow in beds in ground water -
Rise of water in plants through roots -
Flow of blood in the arteries of human body -
Flow in water pipe lines.
A closed cylindrical vessel ofcm diameter andcm high is completely filled with a liquid (sp. weightkg/m3) when rotated about its vertical axis atr.p.m. The total pressure on its lid, is
-
459 kg -
549 kg -
945 kg -
954 kg -
95.4 kg.
Water displaced by a floating wooden block of density 0.5 m long, 2 m wide and 3 m high, is
-
17.5 m3 -
20.0 m3 -
22.5 m3 -
25 km3.
A closed cylindrical vessel ofcm diameter andcm high is completely filled with a liquid (sp. weightkg/m3) when rotated about its vertical axis atr.p.m. The total pressure on its lid, is
-
459 kg -
549 kg -
945 kg -
954 kg -
95.4 kg.
Fluids change the volume under external presssure due to
-
plasticity -
viscosity -
compressibility -
none of these.
If Cv, Cc, Cd and Cr are the hydraulic coefficients of an orifice, then
-
Cd = Cc . Cv -
Cr = 1 + Cv2/Cd -
Cv = Cc + Cd -
Cc = Cv/Cd
Which one of the following statements is true ?
-
The value of kinetic energy correction factor for turbulent flow lies between 1.03 to 1.06 -
The value of kinetic energy correction factor for laminar flow is 2 -
The practical value of kinetic energy correction factor for turbulent flow is unity -
all the above.
The height of water level in a tank above the centre of a circular hole 2.5 cm in diameter ism. The velocity of water flowing through the hole, is
-
31.1 m/sec -
31.2 m/sec -
31.3 m/sec -
31.4 m/sec.
If Cv, Cc, Cd and Cr are the hydraulic coefficients of an orifice, then
-
Cd = Cc . Cv -
Cr = 1 + Cv2/Cd -
Cv = Cc + Cd -
Cc = Cv/Cd
Pick up the correct statement from the following :
-
The fluids which follow 
are known as Newtonian fluids -
The fluids which do not follow the linear relationship between shear and rate of strain are known as non Newtonian fluids -
The substances which flow after yield strains, are known as plastics -
all the above.
Water belongs to
-
Newtonian fluids -
non-Newtonian fluids -
compressible fluid -
none of these.
Pick up the correct statement from the following :
-
The fluids which follow are known as Newtonian fluids -
The fluids which do not follow the linear relationship between shear and rate of strain are known as non Newtonian fluids -
The substances which flow after yield strains, are known as plastics -
all the above.
The specific weight of water iskg/m3
-
at normal pressure of 760 mm -
at 4°C temperature -
at mean sea level -
all the above.
A fluid particle may possess the displacement of
-
translation -
rotation -
distortion -
all the above.
Specific weight of liquid
-
remains constant at every place -
does not remain constant at every place -
varies from place to place on the earth -
does not vary on any other planet.
In Chezy's formula V = C mi
-
V is the mean velocity of flow -
m is the hydraulic mean depth -
i is the loss of head per unit length of pipe -
All the above.
Atmospheric pressure is equal to water column head of
-
9.81 m -
5.0 m -
10.30 m -
7.5 m.
The width of a weir with end contraction, is
-
equal to the width of the channel -
less than the width of the channel -
half the width of the channel -
none of these.
Manning's formula is used for
-
flow in open channels -
head loss due to friction in open channels -
head loss due to friction in pipes flowing full -
flow in pipes.
In steady flow, which one of the following changes with time
-
velocity -
pressure -
density -
none of these.