Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What is a common cause of spontaneous ignition in a mechanical setting?

Oily waste
Excessive heat
Electrical sparks
Flammable vapors

The correct answer is: Oily waste

Oily waste is a significant contributor to spontaneous ignition in mechanical settings due to its ability to generate heat through chemical reactions, particularly when improperly stored or accumulated. When oily rags or waste materials are piled together, they can trap heat and promote oxidation, which may lead to a temperature increase. If this buildup of heat exceeds the ignition temperature of the materials, spontaneous combustion can occur without any direct external source of ignition. The presence of oily waste in a mechanical environment, such as garages or manufacturing facilities, heightens the risk of fire hazards, particularly if it comes into contact with other combustible materials. Proper handling and disposal of oily waste are crucial for fire safety and preventing spontaneous ignition.