The fuels in order of decreasing knock tendency for spark ignition engines are
A. paraffins, aromatics, napthenes
B. paraffins, napthanes, aromatics
C. napthenes, aromatics, paraffins
D. none of the mentioned
Answer:A
The fuels in order of decreasing knock tendency for spark ignition engines are
A. paraffins, aromatics, napthenes B. paraffins, napthanes, aromatics C. napthenes, aromatics, paraffins D. none of the mentioned
Explanation: Paraffins have the highest knocking tendency, while napthanes have less knocking than paraffina and aromatics have the lowest knocking tendency.