In Serbian vehicle safety and regulations, what is the primary cause of thick black exhaust smoke from an internal combustion engine?
Answer and explanation
Correct answer: B. Excessively rich fuel mixture or clogged air filter
- Step 1: Black exhaust smoke indicates rich fuel mixture where unburned carbon soot escapes due to air starvation or injector faults. Answer: Excessively rich fuel mixture or clogged air filter. Why not the others: the alternative options do not represent statutory provisions under Serbian vehicle safety and technical regulations.
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