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WorksheetsDay 50-Nov 11-worksheet-PWD-Fluid kinematics&dynamics,orifices
Total questions: 15
Worksheet time: 11mins
In a 2-D incompressible steady flow, which condition must always be satisfied by the stream function Ψ?
∂x2∂2Ψ−∂y2∂2Ψ=0
∂x2∂2Ψ+∂y2∂2Ψ=0
∂x∂Ψ=∂y∂Ψ
u=∂x∂Ψ
The convective acceleration in fluid flow becomes zero when—
Flow is unsteady
Flow is rotational
Flow is uniform
Flow is compressible
For a sharp-edged orifice, coefficient of contraction (Cc) typically lies in the range—
0.95–0.99
0.61–0.69
0.82–0.90
0.45–0.55
Negative pressure at vena contracta in a mouthpiece occurs due to—
Sudden enlargement
Sudden contraction
Increase in depth of water
Viscous effects
At a stagnation point in Pitot tube measurement—
Pressure is minimum
Velocity is zero
Velocity is maximum
Pressure is below atmospheric
Stream function (Ψ) must satisfy Laplace equation for flow to be irrotational.
True
False
Discharge through a large rectangular orifice depends only on coefficient of contraction.
True
False
Assertion (A): In steady flow, local acceleration is zero everywhere. Reason (R): Local acceleration occurs only when velocity changes with time. Choose the correct option.
Both A and R are true, and R explains A
Both A and R are true, but R does not explain A
A true, R false
A false, R true
Fill in the blank: The product of slopes of streamline and equipotential line is (a) .
Fill in the blank: The theoretical velocity of jet from an orifice is given by v =————
(a)
Fill in the blank: Coefficient of discharge Cd = Cv × —————
(a)
Negative pressure at vena contracta decreases the discharge through the mouthpiece.Is it true?
(a)
Fill in the blank: Uniform flow means ∂V/∂s = ____.
0
1
−1
2
Water flows at a steady velocity through a horizontal pipe with a changeable diameter.
The water velocity is 2 m/sec, and the pressure is 2.5 kPa at point A.
The pressure drops to 1.5 kPa at point B.
What is the water velocity at point B?
(a)
A sharp-edged circular orifice of diameter 50 mm is provided on a tank wall where the water head is 2.4 m above the centre. If Cd = 0.62, what is the theoretical jet velocity?
(a)
