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
Correct Answer :
D. The available head of liquid is less than 5 times the height of orifice
Related Questions
The property of a fluid which enables it to resist tensile stress is known as
Compressibility
Surface tension
Cohesion
Adhesion
According to Bernoulli's equation
Z + p/w + v²/2g = constant
Z + p/w - v²/2g = constant
Z - p/w + v²/2g = constant
Z - p/w - v²/2g = constant
The length of the divergent cone in a Venturimeter is __________ that of the convergent cone.
Equal to
Double
Three to four times
Five to six times
The unit of viscosity is
Metres² per sec
kg-sec/metre
Newton-sec per metre²
Newton-sec per meter
A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, α = Angle of contact of the liquid surface, and σ = Surface tension)
4wd/σ cosα
σ cosα/4wd
4σ cosα/wd
wd/4σ cosα
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 rise or depression of liquid in a tube due to surface tension will increase in size of tube will
Increase
Remain unaffected
May increase or decrease depending on the characteristics of liquid
Decrease
A fluid is said to be ideal, if it is
Incompressible
Viscous and incompressible
Inviscous and compressible
Inviscous and incompressible
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)
The total energy line lies over the hydraulic gradient line by an amount equal to the
Pressure head
Velocity head
Pressure head + velocity head
Pressure head - velocity head
When a body is placed over a liquid, it will sink down if
Gravitational force is equal to the up-thrust of the liquid
Gravitational force is less than the up-thrust of the liquid
Gravitational force is more than the up-thrust of the liquid
None of the above
In the case of steady flow of a fluid, the acceleration of any fluid particle is
Constant
Variable
Zero
Zero under limiting conditions
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 vessel of 4 m3 contains oil which weighs 30 kN. The specific weight of the oil is
4.5 kN/m3
6 kN/m3
7.5 kN/m3
10 kN/m3
The hydraulic mean depth or the hydraulic radius is the ratio of
Area of flow and wetted perimeter
Wetted perimeter and diameter of pipe
Velocity of flow and area of flow
None of these
The total pressure on an immersed surface inclined at an angle θ with the liquid surface is
wA
wx
wAx
wAx/sinθ
A compound pipe of diameter d1, d2 and d3 having lengths l1, l2 and l3 is to be replaced by an equivalent pipe of uniform diameter d and of the same length (l) as that of the compound pipe. The size of the equivalent pipe is given by
l/d² = (l₁/d₁²) + (l₂/d₂²) + (l₃/d₃²)
l/d³ = (l₁/d₁³) + (l₂/d₂³) + (l₃/d₃³)
l/d⁴ = (l₁/d₁⁴) + (l₂/d₂⁴) + (l₃/d₃⁴)
l/d⁵ = (l₁/d₁⁵) + (l₂/d₂⁵) + (l₃/d₃⁵)
The critical depth for a channel is given by (where q = Unit discharge (discharge per unit width) through the channel)
(q/g)1/2
(q²/g)1/3
(q³/g)1/4
(q⁴/g)1/5
If mercury in a barometer is replaced by water, the height of 3.75 cm of mercury will be following cm of water
51 cm
50 cm
52 cm
52.2 cm
Select the wrong statement
An equivalent pipe is treated as an ordinary pipe for all calculations
The length of an equivalent pipe is equal to that of a compound pipe
The discharge through an equivalent pipe is equal to that of a compound pipe
The diameter of an equivalent pipe is equal to that of a compound pipe
In a lock-gate, the reaction between two gates is (where P = Resultant pressure on the lock gate, and α = Inclination of the gate with the normal to the side of the lock)
p/sinα
2p/sinα
p/2sinα
2p/sin (α/2)
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall acts at a distance __________ from the liquid surface.
H/3
H/2
2H/3
3H/4
The velocity at which the flow changes from laminar flow to turbulent flow is called
Critical velocity
Velocity of approach
Sub-sonic velocity
Super-sonic velocity
The center of pressure of a surface subjected to fluid pressure is the point
On the surface at which resultant pressure acts
On the surface at which gravitational force acts
At which all hydraulic forces meet
Similar to metacentre
According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe)
flv²/2gd
flv²/gd
3flv²/2gd
4flv²/2gd
The unit of surface tension is
N/m
N/m2
N/m3
N-m
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 shear stress between the two liquid layers is __________ proportional to the distance between two layers.
Directly
Inversely
Both A and B
None of these
A point, in a compressible flow where the velocity of fluid is zero, is called
Critical point
Vena contracta
Stagnation point
None of these
The vapour pressure over the concave surface is
Less man the vapour pressure over the plane surface
Equal to the vapour pressure over the plane surface
Greater than the vapour pressure over the plane surface
Zero