## 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 sphere
a cylinder

## Hydraulics & Fluid Mechanics An open vessel of water is accelerated up an inclined plane. The free water surface will

any one of above is possible
be horizontal
make an angle in direction of inclination of inclined plane
make an angle in opposite direction to inclination of inclined plane

## Hydraulics & Fluid Mechanics A large Roynold number is indication of

highly turbulent flow.
LAMINAR FLOW
turbulent flow
smooth and streamline flow

## Hydraulics & Fluid Mechanics The Prartdtl mixing length is

maximum at the pipe wall
zero at the pipe wall
None of these
independent of shear stress

## Hydraulics & Fluid Mechanics Fluid is a substance that

has the same shear stress.at a point regardless of its motion
always expands until it fills any container
cannot be subjected to shear forces
cannot remain at rest under action of any shear force

## Hydraulics & Fluid Mechanics Two dimensional flow occurs when

the direction and magnitude of the velocity at all points are identical
the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
the magnitude and direction of the velocity do not change from point to point in the fluid