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
Explosion in furnace
Fuel burns with less air
All the fuel burns instantaneously producing high energy release

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Steam Boilers, Engines, Nozzles and Turbines
Boilers, Engines, Nozzles and Turbines Objective Questions and Answers pdf:- 101. The difference between cornish boiler and lancashire boiler is that

former contains one fire tube and latter contains two fire tubes
None of these
former is fire tube type and latter is water tube type boiler
former is water tube type and latter is fire tube type

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