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In a naturally aspirated engine, the air is drawn into the engine by which mechanism?

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In a naturally aspirated engine, the air is drawn into the engine by which mechanism?

(a) Supercharging

(b) Turbocharging

(c) Upward stroke of the piston

(d) Downward stroke of the piston

I had been asked this question in a national level competition.

I need to ask this question from Petrol Engine Fuel Supply System in division Exhaust System & Petrol Engine Fuel Supply System of Automotive Engine Design

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Right option is (d) Downward stroke of the piston

The best I can explain: In naturally aspirated engines, intake gases are drawn into the engine by atmospheric pressure filling the volumetric void caused by the downward stroke of the piston.

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