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
Correct Answer :
B. The liquid particles at different sections have different velocities
Related Questions
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)
For hypersonic flow, the Mach number is
Unity
Greater than unity
Greater than 2
Greater than 4
An opening in the side of a tank or vessel such that the liquid surface with the tank is below the top edge of the opening, is called
Weir
Notch
Orifice
None of these
Cavitation is caused by
High velocity
High pressure
Weak material
Low pressure
An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank.
Equal to
Directly proportional
Inversely proportional
None of these
The resultant upward pressure of a fluid on a floating body is equal to the weight of the fluid displaced by the body. This definition is according to
Buoyancy
Equilibrium of a floating body
Archimedes' principle
Bernoulli's theorem
Which of the following is the unit of kinematic viscosity?
Pascal
Poise
Stoke
Faraday
The dynamic viscosity of gases __________ with rise in temperature.
Remain unaffected
Increases
Decreases
None of these
The liquid used in manometers should have
Low density
High density
Low surface tension
High surface tension
The density of water is 1000 kg/m3 at
0° C
0° K
4° C
20° C
The viscosity of water is __________ than that of mercury.
Higher
Lower
Same as
None of these
The highest efficiency is obtained with a channel of __________ section.
Circular
Square
Rectangular
Trapezoidal
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
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
A perfect gas
Has constant viscosity
Has zero viscosity
Is in compressible
None of the above
Ratio of inertia force to surface Jension is known as
Mach number
Froude number
Reynoldss number
Weber's number
A large Reynold number is indication of
Smooth and streamline flow
Laminar flow
Steady flow
Highly turbulent flow
A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is
0.83
0.6
0.4
0.3
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
The hydraulic mean depth for a circular pipe of diameter (d) is
d/6
d/4
d/2
d
An orifice is said to be large, if
The size of orifice is large
The velocity of flow is large
The available head of liquid is more than 5 times the height of orifice
The available head of liquid is less than 5 times the height of orifice
Steady 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 balloon lifting in air follows the following principle
Law of gravitation
Archimedes principle
Principle of buoyancy
All of the above
The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta)
2gH
H × √(2g)
2g × √H
√(2gh)
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)
A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be
2A × √H₁/Cd × a × √(2g)
2A × √H₂/Cd × a × √(2g)
2A × (√H₁ - √H₂)/Cd × a × √(2g)
2A × (√H3/2 - √H3/2)/Cd × a × √(2g)
Bulk modulus of a fluid __________ as the pressure increases.
Remain same
Decreases
Increases
None of these
The units of dynamic or absolute viscosity are
Metres² per sec
kg sec/meter
Newton-sec per meter
Newton-sec² per meter
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
The total pressure on an immersed surface inclined at an angle θ with the liquid surface is
wA
wx
wAx
wAx/sinθ