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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
Streamline Flow
turbulent flow
unsteady flow
steady flow
Reynold's number is the ratio of the inertia force to the
elastic force
surface tension force
Viscous Force
gravity force
The discharge over a rectangular notch is
directly proportional to H5/2
directly proportional to H3/2
inversely proportional to H3/2
inversely proportional to H5/2
The velocity corresponding to Reynold number of 2800, is called
higher critical velocity
super-sonic velocity
lower critical velocity
sub-sonic velocity
The critical depth meter is used to measure
depth of flow in an open channel
depth of channel
velocity of flow in an open channel
hydraulic jump
If the coefficient of discharge is 0.6, then the discharge over a right angled notch is
7.141 H5/2
4.171 H5/2
1.417 H5/2
0.417 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)
wA/x
Wax
WX
w.A
A pipe of length more than double the diameter of orifice fitted externally or internally to the orifice is called a
notch
weir
mouthpiece
nozzle
The height of a water column equivalent to a pressure of 0.15 MPa is
35.3 m
25.3 m
15.3 m
45.3 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
pressure with which the liquid is displaced
compressibility of the liquid
weight of the liquid displaced
viscosity of the liquid
A fluid which obeys the Newton's law of viscosity is termed as
newtonian fluid
non-newtonian fluid
ideal fluid
real fluid
When a liquid is flowing through a pipe, the velocity of the liquid is
maximum at the centre and zero near the walls
zero at the centre and maximum near the walls
minimum at the centre and maximum near the walls
maximum at the centre and minimum near the walls
When a body is placed over a liquid, it will float if
gravitational force is equal to the upthrust of the liquid
gravitational force is less than the upthrust of the liquid
None of the above
gravitational force is more than the upthrust of the liquid
The velocity through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel
0.67 times
0.34 times
0.95 times
0.81 times
A flow in which the viscosity of fluid is dominating over the inertia force is called
turbulent flow
steady flow
laminar flow
unsteady flow
A notch is used to measure __________ of liquids
Volume
Pressure
Velocity
Discharge
The total head of a liquid particle in motion is equal to
pressure head + kinetic head + potential head
pressure head - (kinetic head + potential head)
kinetic head - (pressure 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 H
Cd 2g x H5/2
Cd 2g x H2
The variation in the volume of a liquid with the variation of pressure is called its
compressibility
capillarity
surface tension
viscosity
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