Hydraulics and Fluid Mechanics in ME
Principle of similitude forms the basis of

hydraulic designs
designing models so that the result can be converted to prototypes
comparing similarity between design and actual equipment
comparing two identical equipments

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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

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

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