Hydraulics and Fluid Mechanics in ME
In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, then the mouthpiece is said to be

Running free
Partially running full
Partially running free
Running full

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Hydraulics and Fluid Mechanics in ME
In open channels, the specific energy is the

Kinetic energy plotted above the free surface of water
Total energy per unit discharge
Total energy measured above the horizontal datum
Total energy measured with respect to the datum passing through the bottom of the channel

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Hydraulics and Fluid Mechanics in ME
Coefficient of contraction is the ratio of

Area of jet at vena-contracta to the area of orifice
Loss of head in the orifice to the head of water available at the exit of the orifice
Actual velocity of jet at vena contracta to the theoretical velocity
Loss of head in the orifice to the head of water available at the exit of the orifice

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Hydraulics and Fluid Mechanics in ME
Stanton diagram is a

log-log plot of relative roughness against Reynolds number
semi-log plot of friction factor against Reynolds number
semi-log plot of friction factor against relative roughness
log-log plot of friction factor against Reynolds number

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Hydraulics and Fluid Mechanics in ME
Overall efficiency of a centrifugal pump is the ratio of

Manometric head to the energy supplied by the impeller per kN of water
Energy supplied to the pump to the energy available at the impeller
Actual work-done by the pump to the energy supplied to the pump by the prime mover
Energy available at the impeller to the energy supplied to the pump by the prime mover

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