Steam Boilers, Engines, Nozzles and Turbines
The impulse turbine rotor efficiency will have a maximum value of 0.5 cos 2α, where α is the nozzle exit flow angle, if the

Blade solidity is 0.65
Blades are equiangular and frictionless
Blade velocity coefficient is unity
Blades are equiangular

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Steam Boilers, Engines, Nozzles and Turbines
The diagram efficiency is the ratio of

Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
Workdone on the blades to the energy supplied to the blades
Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
None of these

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Steam Boilers, Engines, Nozzles and Turbines
Boiler H.P. is defined as the

Steam evaporation rate per kg of fuel fired
Work done in evaporating 1 kg of steam per hour from and at 100°C into dry saturated steam
The evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam
Work done by 1 kg of steam at saturation condition

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