Question

question 4

1. high octane fuel is used

i
a. high compression engines
c. not in aviation
b. low compression engines
d. only in jet engine fuels

question 5
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Explanation:

High octane fuel resists pre-ignition (knocking), which is more likely to occur in high compression engines due to higher cylinder pressures and temperatures. Low compression engines do not require high octane fuel. High octane fuel is used in aviation (e.g., avgas), so option c is incorrect, and it is not limited to jet engines, so option d is incorrect.

Answer:

a. high compression engines