Spontaneous combustion is a phenomenon in which____________________?

Steam Boilers, Engines, Nozzles and Turbines 13/01/2021

A. all the fuel burns instantaneously producing high energy release
B. fuel burns with less air
C. 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
D. explosion in furnace
E. none of the above

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