## Hydraulics & Fluid Mechanics Two dimensional flow occurs when

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

## Hydraulics & Fluid Mechanics For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is

inversely proportional to Reynolds number and indpendent of pipe wall roughness
directly proportional to pipe wall roughness and independent of Reynolds number
directly proportional to Reynolds number and independent of pipe wall roughness
inversely proportional to Reynolds number and directly proportional to pipe wall roughness

## Hydraulics & Fluid Mechanics The line of action of the buoyant force acts through the centroid of the

displaced volume of the fluid
volume of the floating body
submerged body
volume of the fluid vertically above the body

## Hydraulics & Fluid Mechanics Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

force of diffusion
force of cohesion
force of friction

1/3 R
3/4 R
2/3 R
1/2 R

## Hydraulics & Fluid Mechanics When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies

as the square of the radial distance