Hydraulics And Fluid Mechanics

32 km 20 km 8 km 4 km The absolute roughness of a pipe de-creases with time A pipe becomes smooth after using for long time The friction factor decreases with time The absolute roughness increases with time Cohesion pressure is negligible Cohesion pressure is increased Cohesion pressure is decreased None of the above Mass density Specific gravity Specific weight None of the above Total energy per unit discharge Total energy measured above the horizontal datum Kinetic energy plotted above the free surface of water Total energy measured with respect to the datum passing through the bottom of the channel Adhesion Compressibility Volumetric strain Volumetric index Viscosity Cohesion Adhesion Compressibility

Rise until its weight equals the buoyant force

Tend to move downward and it may finally sink

Float

None of the above

Less

More

Equal

Less at low temperature and more at high temperature

Sink to bottom

Float over fluid

Partly immersed

Be fully immersed with top surface at fluid surface

Same

Higher

Lower

Lower/higher depending on weight of body

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

Is steady

Is one dimensional

Velocity is uniform at all the cross sections

All of the above

Pressure

Flow

Velocity

Discharge

Comparing two identical equipments

Designing models so that the result can be converted to prototypes

Comparing similarity between design and actual equipment

Hydraulic designs