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- Q653 - Engineering Safety & Environmental Protection
170. Through which of the listed processes is sufficient heat produced to cause spontaneous ignition?
Oxidation is the correct answer; slow chemical reactions with oxygen can generate sufficient heat within a material to reach its ignition temperature without an external ignition source. Spontaneous ignition occurs when internal heat generation exceeds heat loss, and oxidation of combustible materials like oily rags can lead to this process. Putrefaction, anaerobic decomposition, and aeration are not primary causes of spontaneous ignition.
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