Correct answer
Petrol and air.
Petrol and air. In this engine, oil is used in a separate lubrication system; do not add it to the fuel as an operating mixture. Use the fuel and oil specified by the manufacturer. The cycle comprises intake, compression, combustion and expansion, and exhaust; combustion releases energy that moves the piston. This question concerns a conventional four-stroke petrol engine.
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Petrol alone, without air.
Petrol and air.
Petrol premixed with lubricating oil as the required fuel.
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