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

Diameter of both the pipes is same
Loss of head and discharge 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 an impulse turbine is the

Ratio of the work done on the wheel to the energy of the jet
Ratio of the actual power produced by the turbine to the energy actually supplied by the turbine
None of these
Ratio of the actual work available at the turbine to the energy imparted to the wheel

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