Research octane number refers to the___________________?
Correct answer: D. Unleaded motor fuels
- A. Low octane number motor fuels
- B. High octane number motor fuels
- C. High octane number aviation fuels
- D. Unleaded motor fuels
Explanation
Research octane number is the anti-knock rating measured by the research test method for motor gasoline, commonly associated with unleaded petrol. Aviation fuels are normally described using aviation octane or performance numbers rather than RON.
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