Hydraulics and Fluid Mechanics in ME
A manometer is used to measure

Atmospheric pressure
Difference of pressures between two points in a pipe
Pressure in Venturimeter
Pressure in pipes and channels

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

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