The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta)
2gH
H × √(2g)
2g × √H
√(2gh)
Correct Answer :
D. √(2gh)
Related Questions
In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be
Double
Four times
Eight times
Sixteen times
In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than
Frictional force
Viscosity
Surface friction
All of the above
The maximum discharge over a broad crested weir is
0.384 Cd × L × H1/2
0.384 Cd × L × H3/2
1.71 Cd × L × H1/2
1.71 Cd × L × H3/2
The top of the weir over which the water flows is known as
Sill or crest
Nappe or vein
Orifice
None of these
The discharge through a convergent mouthpiece is __________ the discharge through an internal mouthpiece of the same diameter and head of water.
Equal to
One-half
Three fourth
Double
Gauge pressure at a point is equal to the absolute pressure __________ the atmospheric pressure.
Plus
Minus
Divide
Multiply
Re-entrant or Borda's mouthpiece is an __________ mouthpiece.
Internal
External
Both A and B
None of these
The buoyancy depends on
Mass of liquid displaced
Viscosity of the liquid
Pressure of the liquid displaced
Depth of immersion
The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch __________ the discharge over the triangular notch.
Plus
Minus
Divide
None of these
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
The Reynold's number of a ship is __________ to its velocity and length.
Directly proportional
Inversely proportional
Square root of velocity
None of these
When a liquid is flowing through a pipe, the velocity of the liquid is
Maximum at the centre and minimum near the walls
Minimum at the centre and maximum near the walls
Zero at the centre and maximum near the walls
Maximum at the centre and zero near the walls
Two dimensional flows occurs when
The direction and magnitude of the velocity at all points are identical
The velocity of successive fluid particles, at any point, is the same at successive periods of time
The magnitude and direction of the velocity do not change from point to point in the fluid
The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane
The ratio of the inertia force to the __________ is called Euler's number.
Pressure force
Elastic force
Surface tension force
Viscous force
All the terms of energy in Bernoulli's equation have dimension of
Energy
Work
Mass
Length
The discharge through a small rectangular orifice is given by (where Cd = Coefficient of discharge for the orifice, a = Cross-sectional area of the orifice, h = Height of the liquid above the centre of the orifice)
Q = Cd × a × 2gh
Q = (2/3). Cd × a × h
Q = (Cd × a)/√(2gh)
Q = (3Cd × a)/√(2h)
The velocity corresponding to Reynold number of 2000 is called
Sub-sonic velocity
Super-sonic velocity
Lower critical velocity
Higher critical velocity
One poise is equal to
0.1 N-s/m2
1 N-s/m2
10 N-s/m2
100 N-s/m2
The pressure of the liquid flowing through the divergent portion of a Venturimeter
Remains constant
Increases
Decreases
Depends upon mass of liquid
Which of the following is dimensionless?
Specific weight
Specific volume
Specific speed
Specific gravity
Fluid is a substance which offers no resistance to change of
Pressure
Flow
Shape
Volume
A fluid which obeys the Newton's law of viscosity is termed as
Real fluid
Ideal fluid
Newtonian fluid
Non-Newtonian fluid
A weir is said to be broad crested weir, if the width of the crest of the weir is ________ half the height of water above the weir crest.
Equal to
Less than
More than
None of these
When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is
1.84 (L - 0.1nH)H3/2
1.84 (L - nH)H2
1.84 (L - 0.1nH)H5/2
1.84 (L - nH)H3
Poise is the unit of
Surface tension
Capillarity
Viscosity
Shear stress in fluids
The region between the separation streamline and the boundary surface of the solid body is known as
Wake
Drag
Lift
Boundary layer
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
Water is a __________ fluid.
Real
Ideal
Newtonian
Non-Newtonian
A fluid having no viscosity is known as
Real fluid
Ideal fluid
Newtonian fluid
Non-Newtonian fluid
Choose the wrong statement
The horizontal component of the hydrostatic force on any surface is equal to the normal force on the vertical projection of the surface
The horizontal component acts through the center of pressure for the vertical projection
The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area
The vertical component passes through the center of pressure of the volume