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

Whirl velocity at inlet is equal to that at the outlet
Axial velocity at inlet is equal to that at the outlet
Relative velocity at the inlet of the moving blade 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 difference between Cornish boiler and Lancashire boiler is that

None of the listed here
Former is fire tube type and latter is water tube type boiler
Former contains one fire tube and latter contains two fire tubes
Former is water tube type and latter is fire tube type

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