Internal Combustion Engines
The fuels in order of decreasing knock tendency for spark ignition engines are

Paraffin, aromatic, napthene
Napthene, aromatics, paraffin
Paraffin, napthene, aromatic
Napthene, paraffin, aromatic

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Internal Combustion Engines
The purpose of testing an internal combustion engine is

To conform the data used in design, the validity of which may be doubtful
All of these
To determine the information, which cannot be obtained by calculations
To satisfy the customer regarding the performance of the engine

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