Hydraulics and Fluid Mechanics in ME
Cavitation will begin when

pressure becomes more than critical pressure
flow is increased
pressure is increased
the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid

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

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

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