Hydraulics & Fluid Mechanics
In which of the following the friction drag is generally larger than pressure drag?

a circular disc or plate held normal to flow
an airfoil
a cylinder
a sphere

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Hydraulics & Fluid Mechanics
Non uniform flow occurs when

the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
velocity, depth, pressure, etc. change from point to point in the fluid flow
the direction and magnitude of the velocity at all points are identical

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Hydraulics & Fluid Mechanics
According to Bernoulli’s equation for steady ideal fluid flow

total energy is constant throughout
velocity and pressure are inversely proportional
the energy is constant along a stream-line but may vary across streamlines
principle of conservation of mass holds

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