Steam Boilers, Engines, Nozzles and Turbines
Spontaneous combustion is a phenomenon in which

Coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal
Fuel burns with less air
All the fuel burns instantaneously producing high energy release
Explosion in furnace

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

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
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

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