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

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

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Hydraulics and Fluid Mechanics in ME
If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be

from reservoir A to reservoirs B and C
from reservoir B to reservoirs C and A
unpredictable
from reservoir C to reservoirs A and B

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