For determining the ignition quality of compression ignition

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For determining the ignition quality of compression ignition engine fuels, the reference fuels used are

1. Isooctane and n-heptane
2. Cetane and α -methylnapthalene
3. Hexadecane and n-heptane
4. Cetane and isooctane

Correct Option: B

Cetane and α -methylnapthalene