Viscous force is the __________ of shear stress due to viscosity and cross-section area of flow.
Sum
Different
Product
Ratio
Correct Answer :
C. Product
Related Questions
The divergent portion of a Venturimeter is made longer than convergent portion in order to
Avoid the tendency of breaking away the stream of liquid
To minimise frictional losses
Both (A) and (B)
None of these
The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly enlarged to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden enlargement is
(v₁ - v₂)²/g
(v₁² - v₂²)/g
(v₁ - v₂)²/2g
(v₁² - v₂²)/2g
In the case of steady flow of a fluid, the acceleration of any fluid particle is
Constant
Variable
Zero
Zero under limiting conditions
The shear stress-strain graph for a Newtonian fluid is a
Straight line
Parabolic curve
Hyperbolic curve
Elliptical
The body will float if the force of buoyancy is __________ the weight of the liquid displaced.
Equal to
Less than
More than
None of these
The total energy line lies over the centre line of the pipe by an amount equal to
Pressure head
Velocity head
Pressure head + velocity head
Pressure head - velocity head
When a body, floating in a liquid, is given a small angular displacement, it starts oscillating about a point known as
Centre of pressure
Centre of gravity
Centre of buoyancy
Metacentre
When the flow in an open channel is gradually varied, the flow is said to be
Steady uniform flow
Steady non-uniform flow
Unsteady uniform flow
Unsteady non-uniform flow
The power transmitted through a pipe is (where w = Specific weight in N/m3, and Q = Discharge in m3/s)
w × Q × H
w × Q × hf
w × Q (H - hf)
w × Q (H + hf)
A one dimensional flow is one which
Is uniform flow
Is steady uniform flow
Takes place in straight lines
Involves zero transverse component of flow
Select the correct statement
Weber's number is the ratio of inertia force to elastic force.
Weber's number is the ratio of gravity force to surface tension force.
Weber's number is the ratio of viscous force to pressure force.
Weber's number is the ratio of inertia force to surface tension force.
When a vertical wall is subjected to pressures due to liquid on both sides, the resultant pressure is the __________ of the two pressures.
Sum
Difference
Arithmetic mean
Geometric mean
The total energy of a liquid particle in motion is equal to
Pressure energy + kinetic energy + potential energy
Pressure energy - (kinetic energy + potential energy)
Potential energy - (pressure energy + kinetic energy
Kinetic energy - (pressure energy + potential energy)
The stress-strain relation of the Newtonian fluid is
Linear
Parabolic
Hyperbolic
Inverse type
Re-entrant or Borda's mouthpiece is an __________ mouthpiece.
Internal
External
Both A and B
None of these
The coefficient of discharge for an external mouthpiece depends upon
Velocity of liquid
Pressure of liquid
Area of mouthpiece
Length of mouthpiece
The loss of head at exit of a pipe is (where v = Velocity of liquid in the pipe)
v²/2g
0.5v²/2g
0.375v²/2g
0.75v²/2g
If w is the specific weight of liquid and k the depth of any point from the surface, then pressure intensity at that point will be
h
wh
w/h
h/w
A pressure of 25 m of head of water is equal to
25 kN/ m²
245 kN/ m²
2500 kN/m²
2.5 kN/ m²
An object having 10 kg mass weighs 9.81 kg on a spring balance. The value of 'g' at this place is
10 m/sec²
9.81 m/sec²
9.75 m/sec²
9 m/sec
For a floating body to be in stable equilibrium, its metacentre should be
Below the center of gravity
Below the center of buoyancy
Above the center of buoyancy
Above the center of gravity
For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called
Continuity equation
Bernoulli's equation
Pascal's law
Archimedess principle
According to Manning's formula, the discharge through an open channel is (where M = Manning's constant)
A × M × m1/2 × i2/3
A × M × m2/3 × i1/2
A1/2 × M2/3 × m × i
A2/3 × M1/3 × m × i
Piezometer is used to measure
Pressure in pipe, channels etc.
Atmospheric pressure
Very low pressures
Difference of pressure between two points
Differential manometer is used to measure
Pressure in pipes, channels etc.
Atmospheric pressure
Very low pressure
Difference of pressure between two points
The highest efficiency is obtained with a channel of __________ section.
Circular
Square
Rectangular
Trapezoidal
The ratio of the inertia force to the elastic force is called
Reynold's number
Froude's number
Weber's number
Mach number
A flow through an expanding tube at constant rate is called
Steady uniform flow
Steady non-uniform flow
Unsteady uniform flow
Unsteady non-uniform flow
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
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