Mach number is the ratio of inertia force to
-
viscosity -
surface tension -
gravitational force -
elasticity.
Hydraulic ram is a device
-
for lifting water without an electric motor -
for accelerating water flow -
for lifting heavy loads -
none of these.
Total head of a liquid particle in motion is the sum of
-
potential head and kinetic head -
kinetic head and pressure head -
potential head and pressure head -
potential head, kinetic head and pressure head.
The discharge over a Cipolletti weir of length 2.m when the head over the weir is 1 m, is
-
2.0 m3 -
2.5 m3 -
3.0 m3 -
4.0 m3.
The ratio of the percentagge error in the discharge and percentage error in the measurement of head over a triangular notch, is
-
2/3 -
3/2 -
2/5 -
5/2
In a venturimeter, the divergent cone is kept
-
shorter than convergent cone -
equal to covergent cone -
longer than convergent cone -
none of these.
If Re is the Renold's number, the coefficient of friction for laminar flow is
For a long pipe, the head loss
-
at the entrance is ignored -
at the outlet is ignored -
at the entrance and outlet both are ignored -
due to friction is ignored.
Poise is the unit of
-
viscosity -
velocity gradient -
mass density -
kinematic viscous.
In a venturimeter, the divergent cone is kept
-
shorter than convergent cone -
equal to covergent cone -
longer than convergent cone -
none of these.
Uniform flow is said to occur when
-
size and shape of the cross-section in a particular length remain constant -
size and shape of the cross-section change along a length -
frictional loss in the particular length of the channel will the more than the drop in its elevation -
frictional loss in the particular length of the channel, will be less than the drop in elevation.
Gauge pressure is
-
absolute pressure - atmospheric pressure -
absolute pressure + atmospheric pressure -
atmospheric pressure - absolute pressure -
none of these.
For exerting a pressure of 4.8 kg/cm2, the depth of oil (specific gravity 0.8), should be
-
40 cm -
41 cm -
56 cm -
60 cm -
76 cm.
For maximum horse power of a nozzle, the head supplied must be equal to
-
head loss in the pipe due to friction -
twice the head loss in the pipe due to friction -
thrice the head loss in the pipe due to friction -
four times the head loss in the pipe due to friction.
When a liquid rotates at constant angular velocity about a vertical axis of a rigid body, the pressure
-
increases linearly to its radial distance -
varies inversely as the altitude along any vertical line -
varies as the square of the radial distance -
decreases as the square of the radial distance -
none of these.
Most economical section of a triangular channel, is
-
equilateral triangle -
right angled triangle -
isosceles triangle with 45° vertex angle -
right angled triangle with equal sides.
Equation of continuity of flow is based on the principle of conservation of
-
mass -
momentum -
force -
none of these.
The velocity distribution of viscous fluid through a circular/pipe is :
-
hyperbolic -
circular -
parabolic -
elliptical.
If v1 and v2 are the velocities of flow before and after sudden enlargement in a pipe, the head loss given by Carnot and Borda equation, is
-
(v22 - v12)/2g -
(v1 - v2)2/2g -
(v2 - v1)2/2g -
(v1 + v2)2/2g.
The velocity of the fluid particle at the centre of the pipe section, is
-
minimum -
maximum -
equal throughout -
none of these.
The ratio of the inertia and gravitational force acting in any flow, ignoring other forces, is called
-
Euler number -
Frode number -
Reynold number -
Weber number.
Specific weight of sea water is more than that of pure water because of
-
dissolved air -
dissolved salts -
suspended matter -
all the above.
On a flow net diagram, the distance between two consecutive steam lines at two successive sections are 1 cm and 0.5 cm respectively. If the velocity at the first section is 1 m/sec, the velocity at the second is
-
1.0 m/sec -
0.5 m/sec -
2.0 m/sec -
2.5 m/sec -
3 m/sec.
The length of pipe is L, velocity of flow of a liquid in the pipe is V. If t is the time in second required to close the valve, the head of pressure
-
-
-
-
none of these.
Hydraulic grade line
-
remains above the centre line of conduit -
remains below the centre line of conduit -
remains parallel to the centre line of conduit -
may be above or below the centre line of conduit.
For mountaneous regions having steep slope, wagons for carrying liquid are made with bottom
-
parallel to the road surface -
parallel to the horizontal surface -
inclined upward while moving upwards -
inclined downward while moving downwards.
Hydraulic grade line
-
remains above the centre line of conduit -
remains below the centre line of conduit -
remains parallel to the centre line of conduit -
may be above or below the centre line of conduit.
The main assumption of Bernoulli's equation is :
-
The velocity of energy of liquid particle, across any cross-section of a pipe is uniform -
No external force except the gravity acts on the liquid -
There is no loss of energy of the liquid while flowing -
All the above.
A cylindrical vesselcm high is revolved about its vertical axis so that the water touches the bottom when it just spills out. If the radius of the cylinder is 5 cm, the angular velocity of rotation, is
-
2 rad/sec -
3 rad/sec -
4 rad/sec -
5 rad/sec -
none of these.
The main assumption of Bernoulli's equation is :
-
The velocity of energy of liquid particle, across any cross-section of a pipe is uniform -
No external force except the gravity acts on the liquid -
There is no loss of energy of the liquid while flowing -
All the above.