Principle of similitude forms the basis of
Comparing two identical equipments
Designing models so that the result can be converted to prototypes
Comparing similarity between design and actual equipment
Hydraulic designs
Correct Answer :
B. Designing models so that the result can be converted to prototypes
Related Questions
The flow in which conditions do not change with time at any point, is known as
One dimensional flow
Uniform flow
Steady flow
Turbulent flow
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 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]
The mass per unit volume of a liquid at a standard temperature and pressure is called
Specific weight
Mass density
Specific gravity
None of these
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
According to equation of continuity,
w1a1 = w2a2
w1v1 = w2v2
a1v1 = a2v2
a1/v1 = a2/v2
An error of 1% in measuring head over the apex of the notch (H) will produce an error of _________ in discharge over a triangular notch.
1 %
1.5 %
2 %
2.5 %
Pressure of the order of 10 torr can be measured by
Bourdon tube
Pirani Gauge
Micro-manometer
Lonisation gauge
The bulk modulus of elasticity with increase in pressure
Increases
Decreases
Remain constant
Increases first up to certain limit and then decreases
The pressure of the liquid flowing through the divergent portion of a Venturimeter
Remains constant
Increases
Decreases
Depends upon mass of liquid
In the case of steady flow of a fluid, the acceleration of any fluid particle is
Constant
Variable
Zero
Zero under limiting conditions
The centre of pressure acts __________ the centre of gravity of immersed surface.
At
Above
Below
None of these
The factional resistance of a pipe varies approximately with __________ of the liquid.
Pressure
Velocity
Square of velocity
Cube of velocity
The coefficient of discharge for an external mouthpiece is
0.375
0.5
0.707
0.855
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 flow in which the particles of a fluid attain such velocities that varies from point to point in magnitude and direction as well as from instant to instant, is known as
One dimensional flow
Uniform flow
Steady flow
Turbulent flow
The stress-strain relation of the Newtonian fluid is
Linear
Parabolic
Hyperbolic
Inverse type
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 most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to
Half the depth
Half the breadth
Twice the depth
Twice the breadth
When a body is immersed wholly or partially in a liquid, it is lifted up by a force equal to the weight of liquid displaced by the body. This statement is called
Pascal's law
Archimedess principle
Principle of floatation
Bernoulli's theorem
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
Operation of McLeod gauge used for low pressure measurement is based on the principle of
Gas law
Boyle's law
Charles law
Pascal's law
Differential manometer is used to measure
Pressure in pipes, channels etc.
Atmospheric pressure
Very low pressure
Difference of pressure between two points
A flow whose streamline is represented by a straight line, is called __________ dimensional flow.
One
Two
Three
Four
Froude's number is the ratio of inertia force to
Pressure force
Elastic force
Gravity force
Surface tension force
The flow which neglects changes in a transverse direction is known as
One dimensional flow
Uniform flow
Steady flow
Turbulent flow
Capillary action is due to the
Surface tension
Cohesion of the liquid
Adhesion of the liquid molecules and the molecules on the surface of a solid
All of the above
A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used?
1 : 5
1 : 2.5
1 : 25
1 : √5
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 discharge through a large rectangular orifice is given by (where H1 = Height of the liquid above the top of the orifice, H2 = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and Cd = Coefficient of discharge)
Q = (2/3) Cd × b × √(2g) × (H2 - H1)
Q = (2/3) Cd × b × √(2g) × (H2 1/2 - H1 1/2)
Q = (2/3) Cd × b × √(2g) × (H2 3/2 - H1 3/2)
Q = (2/3) Cd × b × √(2g) × (H2 2 - H1 2)