Hydraulics and Fluid Mechanics in ME
A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if

Loss of head and discharge of both the pipes is same
Diameter of both the pipes is same
Length of both the pipes is same
Loss of head and velocity of flow in both the pipes is same

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Hydraulics and Fluid Mechanics in ME
The hydraulic efficiency of a reaction turbine, is the ratio of

Work-done on the wheel to the energy (or head of water) actually supplied to the turbine
Power produced by the turbine to the energy actually supplied by the turbine
None of these
Actual work available at the turbine to energy imparted to the wheel

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