Hydraulics and Fluid Mechanics in ME
Discharge of a centrifugal pump is

Directly proportional to diameter of its impeller
Directly proportional to (diameter)² of its impeller
Inversely proportional to (diameter)² of its impeller
Inversely proportional to diameter of its impeller

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Hydraulics and Fluid Mechanics in ME
Runaway speed of a hydraulic turbine is

The speed at which turbine runner will be damaged
The speed corresponding to maximum overload permissible
Full load speed
The speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open

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