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Hydraulics and Fluid Mechanics
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A flow in which the quantity of liquid flowing per second is not constant, is called
turbulent flow
steady flow
unsteady flow
Streamline Flow
Reynold's number is the ratio of the inertia force to the
gravity force
Viscous Force
elastic force
surface tension force
The discharge over a rectangular notch is
directly proportional to H5/2
directly proportional to H3/2
inversely proportional to H5/2
inversely proportional to H3/2
The velocity corresponding to Reynold number of 2800, is called
lower critical velocity
higher critical velocity
super-sonic velocity
sub-sonic velocity
The critical depth meter is used to measure
hydraulic jump
depth of flow in an open channel
depth of channel
velocity of flow in an open channel
If the coefficient of discharge is 0.6, then the discharge over a right angled notch is
0.417 H5/2
1.417 H5/2
7.141 H5/2
4.171 H5/2
The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface)
WX
w.A
Wax
wA/x
A pipe of length more than double the diameter of orifice fitted externally or internally to the orifice is called a
nozzle
mouthpiece
notch
weir
The height of a water column equivalent to a pressure of 0.15 MPa is
45.3 m
35.3 m
15.3 m
25.3 m
The maximum discharge over a broad crested weir is
0.384 Cd x L x H3/2
0.384 Cd x L x H1/2
1.71 Cd x L x H3/2
1.71 Cd x L x H1/2
The buoyancy depends upon the
weight of the liquid displaced
viscosity of the liquid
pressure with which the liquid is displaced
compressibility of the liquid
A fluid which obeys the Newton's law of viscosity is termed as
non-newtonian fluid
real fluid
newtonian fluid
ideal fluid
When a liquid is flowing through a pipe, the velocity of the liquid is
zero at the centre and maximum near the walls
maximum at the centre and minimum near the walls
minimum at the centre and maximum near the walls
maximum at the centre and zero near the walls
When a body is placed over a liquid, it will float if
gravitational force is more than the upthrust of the liquid
gravitational force is equal to the upthrust of the liquid
gravitational force is less than the upthrust of the liquid
None of the above
The velocity through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel
0.34 times
0.67 times
0.81 times
0.95 times
A flow in which the viscosity of fluid is dominating over the inertia force is called
turbulent flow
laminar flow
steady flow
unsteady flow
A notch is used to measure __________ of liquids
Discharge
Volume
Velocity
Pressure
The total head of a liquid particle in motion is equal to
pressure head - (kinetic head + potential head)
kinetic head - (pressure head + potential head)
pressure head + kinetic head + potential head
potential head - (pressure head + kinetic head)
The discharge over a right angled notch is (where H = Height of liquid above the apex of notch)
Cd 2g x H3/2
Cd 2g x H5/2
Cd 2g x H
Cd 2g x H2
The variation in the volume of a liquid with the variation of pressure is called its
capillarity
surface tension
viscosity
compressibility
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