In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice.
Equal to
One-fourth
One-third
One-half
Correct Answer :
B. One-fourth
Related Questions
The surface tension of mercury at normal temperature compared to that of water is
More
Less
Same
More or less depending on size of glass tube
The increase in pressure at the outer edge of a drum of radius (r) completely filled up with liquid of density (ρ) and rotating at (ω) rad/s is
ρ ω2 r2
2ρ ω2 r2
ρ ω2 r2/2
ρ ω2 r2/4
In case of flow through parallel pipes,
The head loss for all the pipes is same
The total discharge is equal to the sum of discharges in the various pipes
The total head loss is the sum of head losses in the various pipes
Both (A) and (B)
A fluid in equilibrium can't sustain
Tensile stress
Compressive stress
Shear stress
Bending stress
Pitot tube is used for measurement of
Pressure
Flow
Velocity
Discharge
Fluid is a substance which offers no resistance to change of
Pressure
Flow
Shape
Volume
When the Mach number is more than 6, the flow is called
Sub-sonic flow
Sonic flow
Super-sonic flow
Hyper-sonic flow
The shear stress between the two liquid layers is __________ proportional to the distance between two layers.
Directly
Inversely
Both A and B
None of these
Metacentre is the point of intersection of
Vertical upward force through e.g. of body and center line of body
Buoyant force and the center line of body
Midpoint between e.g. and center of buoyancy
All of the above
A differential manometer is used to measure
Atmospheric pressure
Pressure in pipes and channels
Pressure in Venturimeter
Difference of pressures between two points in a pipe
The ratio of the inertia force to the __________ is called Euler's number.
Pressure force
Elastic force
Surface tension force
Viscous force
In a venturi-flume, the flow takes place at
Atmospheric pressure
Gauge pressure
Absolute pressure
None of these
In the case of steady flow of a fluid, the acceleration of any fluid particle is
Constant
Variable
Zero
Zero under limiting conditions
The viscosity of water at 20°C is
One stoke
One centistoke
One poise
One centipoise
Choose the wrong statement
Any weight, floating or immersed in a liquid, is acted upon by a buoyant force
Buoyant force is equal to the weight of the liquid displaced
The point through which buoyant force acts, is called the center of buoyancy
Center of buoyancy is located above the center of gravity of the displaced liquid
Barometer is used to measure
Pressure in pipes, channels etc.
Atmospheric pressure
Very low pressure
Difference of pressure between two points
Gradually varied flow is
Steady uniform
Non-steady non-uniform
Non-steady uniform
Steady non-uniform
The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be
500 kg
1000 kg
1500 kg
2000 kg
The velocity corresponding to Reynold number of 2000 is called
Sub-sonic velocity
Super-sonic velocity
Lower critical velocity
Higher critical velocity
Property of a fluid by which its own molecules are attracted is called
Adhesion
Cohesion
Viscosity
Compressibility
The Newton's law of resistance is based on the assumption that the
Planes of the body are completely smooth
Space around the body is completely filled with the fluid
Fluid particles do not exert any influence on one another
All of the above
The discharge over a rectangular weir, considering the velocity of approach, is (whereH1 = H + Ha = Total height of water above the weir, H = Height of water over the crest of the weir, and Ha = Height of water due to velocity of approach)
(2/3) Cd × L.√2g [H1 - Ha]
(2/3) Cd × L. √2g [H1 3/2 - Ha 3/2]
(2/3) Cd × L.√2g [H1 2 - Ha 2]
(2/3) Cd × L. √2g [H1 5/2 - Ha 5/2]
Which of the following instruments is used to measure flow on the application of Bernoulli's theorem?
Venturimeter
Orifice plate
Nozzle
All of the above
Euler's equation in the differential form for the motion of liquids is given by
dp/ρ + g.dz + v.dv = 0
dp/ρ - g.dz + v.dv = 0
ρ.dp + g.dz + v.dv = 0
ρ.dp - g.dz + v.dv = 0
Metacentric height is the distance between the metacentre and
Water surface
Center of pressure
Center of gravity
Center of buoyancy
The flow in a pipe or channel is said to be non-uniform when
The liquid particles at all sections have the same velocities
The liquid particles at different sections have different velocities
The quantity of liquid flowing per second is constant
Each liquid particle has a definite path
When a body is placed over a liquid, it will float if
Gravitational force is equal to the up-thrust of the liquid
Gravitational force is less than the up-thrust of the liquid
Gravitational force is more than the up-thrust of the liquid
None of the above
The pressure of a liquid measured with the help of a Piezometer tube is
Vacuum pressure
Gauge pressure
Absolute pressure
Atmospheric pressure
Fluid is a substance that
Cannot be subjected to shear forces
Always expands until it fills any container
Has the same shear stress at a point regardless of its motion
Cannot remain at rest under action of any shear force
The critical depth meter is used to measure
Velocity of flow in an open channel
Depth of flow in an open channel
Hydraulic jump
Depth of channel