For volatile petroleum fuels of high octane number, pre-ignition is reduced at ……….. mixture.
A. very rich
B. very lean
C. equal
D. none of the mentioned
Answer:A
For volatile petroleum fuels of high octane number, pre-ignition is reduced at ……….. mixture.
A. very rich B. very lean C. equal D. none of the mentioned
Explanation: For volatile petroleum fuels of high octane number, pre-ignition is reduced at very lean mixture while the knocking is reduced at very rich mixture.