Hydraulics and Fluid Mechanics in ME
Stanton diagram is a

log-log plot of relative roughness against Reynolds number
semi-log plot of friction factor against Reynolds number
semi-log plot of friction factor against relative roughness
log-log plot of friction factor against Reynolds number

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Hydraulics and Fluid Mechanics in ME
In case of flow through parallel pipes,

Both (A) and (B)
The total discharge is equal to the sum of discharges in the various pipes
The head loss for all the pipes is same
The total head loss is the sum of head losses in the various pipes

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