With an increase in size of tube, the rise or depression of liquid in the tube due to surface tension will
Decrease
Increase
Remain unchanged
Depend upon the characteristics of liquid
Correct Answer :
A. Decrease
Related Questions
An average value of coefficient of velocity is
0.62
0.76
0.84
0.97
When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as
Steady flow
Turbulent flow
Vortex flow
Uniform flow
The velocity corresponding to Reynold number of 2000 is called
Sub-sonic velocity
Super-sonic velocity
Lower critical velocity
Higher critical velocity
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 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
Which of the following statement is wrong?
A flow whose streamline is represented by a curve is called two dimensional flow.
The total energy of a liquid particle is the sum of potential energy, kinetic energy and pressure energy.
The length of divergent portion in a Venturimeter is equal to the convergent portion.
A pitot tube is used to measure the velocity of flow at the required point in a pipe.
The region between the separation streamline and the boundary surface of the solid body is known as
Wake
Drag
Lift
Boundary layer
True one-dimensional flow 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
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 velocity at which the laminar flow stops, is known as
Velocity of approach
Lower critical velocity
Higher critical velocity
None of these
The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta)
2gH
H × √(2g)
2g × √H
√(2gh)
The value of coefficient of velocity for a sharp edged orifice __________ with the head of water.
Decreases
Increases
Remain same
None of these
Center of pressure on an inclined plane is
At the Centroid
Above the Centroid
Below the Centroid
At metacentre
Two pipe systems can be said to be equivalent, when the following quantities are same
Friction loss and flow
Length and diameter
Flow and length
Friction factor and diameter
Uniform flow 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 pleasure
To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than
2.4 m above the hydraulic gradient
6.4 m above the hydraulic gradient
10.0 m above the hydraulic gradient
5.0 above the hydraulic gradient
The value of mass density in kg-sec-V-m⁴ for water at 0°C is
1
1000
100
101.9
Which of the following is dimensionless?
Specific weight
Specific volume
Specific speed
Specific gravity
Property of a fluid by which its own molecules are attracted is called
Adhesion
Cohesion
Viscosity
Compressibility
A structure, whose width is __________ the width of the channel, is called a flumed structure.
Less than
More than
Equal
None of these
In one dimensional flow, the flow
Is steady and uniform
Takes place in straight line
Takes place in curve
Takes place in one direction
According to Bernoulli's equation for steady ideal fluid flow
Principle of conservation of mass holds
Velocity and pressure are inversely proportional
Total energy is constant throughout
The energy is constant along a streamline but may vary across streamlines
The coefficient of discharge for an external mouthpiece depends upon
Velocity of liquid
Pressure of liquid
Area of mouthpiece
Length of mouthpiece
The velocity corresponding to Reynold number of 2800, is called
Sub-sonic velocity
Super-sonic velocity
Lower critical velocity
Higher critical velocity
Newton's law of viscosity is a relationship between
Shear stress and the rate of angular distortion
Shear stress and viscosity
Shear stress, velocity and viscosity
Pressure, velocity and viscosity
Uniform flow occurs when
The flow is steady
The flow is streamline
Size and shape of the cross section in a particular length remain constant
Size and cross section change uniformly along length
The force per unit length is the unit of
Surface tension
Compressibility
Capillarity
Viscosity
The Francis formula for the discharge over Cipoletti weir is
1.84 LH1/2
1.84 LH
1.84 LH3/2
1.84 LH5/2
An error of 1% in measuring head over the crest of the notch (H) will produce an error of __________ in discharge over a triangular notch,
1 %
1.5 %
2 %
2.5 %
The normal stress in a fluid will be constant in all directions at a point only if
It is incompressible
It has uniform viscosity
It has zero viscosity
It is at rest