Steam Boilers, Engines, Nozzles and Turbines
In an ideal impulse turbine, the

Relative velocity at the inlet of the moving blade is equal to that at the outlet
Whirl velocity at inlet is equal to that at the outlet
Axial velocity at inlet is equal to that at the outlet
Absolute velocity at the inlet of moving blade is equal to that at the outlet

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Steam Boilers, Engines, Nozzles and Turbines
The relative efficiency is defined as the

Ratio of brake power to the indicated power
Ratio of heat equivalent to indicated power to the energy supplied in steam
Ratio of thermal efficiency to Rankine efficiency
Product of thermal efficiency and Rankine efficiency

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