Steam Boilers, Engines, Nozzles and Turbines
Besides mean effective pressure, the data required to determine the indicated power of an engine include

Piston diameter, specific fuel consumption and Calorific value of fuel
Specific fuel consumption, speed of rotation and torque
Piston diameter, length of stroke and speed of rotation
Piston diameter, length of stroke and calorific value of fuel

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

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

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