Hydraulics and Fluid Mechanics in ME
In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by

Not possible
Some other alterations in the impeller
Trimming the impeller size to the required size by machining
Designing new impeller

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Hydraulics and Fluid Mechanics in ME
Meta-centric height is given as the distance between

The center of gravity of the body and the center of pressure
The center of gravity of the body and the metacenter
Center of buoyancy and metacenter
The center of gravity of the body and the center of buoyancy

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