Which stroke is responsible for expelling the combustion products from the cylinder?

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Multiple Choice

Which stroke is responsible for expelling the combustion products from the cylinder?

Explanation:
The exhaust stroke is the one that clears the cylinder of spent combustion products. As the piston moves upward, the exhaust valve opens and pushes the burnt gases out through the exhaust system. This clearing is essential so that the next induction stroke can draw in a fresh air–fuel charge. The other strokes have different roles: induction brings the charge in, compression tightens it for efficient combustion, and the power stroke uses that combustion to push the piston down. None of those stages are fundamentally about expelling the exhaust gases.

The exhaust stroke is the one that clears the cylinder of spent combustion products. As the piston moves upward, the exhaust valve opens and pushes the burnt gases out through the exhaust system. This clearing is essential so that the next induction stroke can draw in a fresh air–fuel charge. The other strokes have different roles: induction brings the charge in, compression tightens it for efficient combustion, and the power stroke uses that combustion to push the piston down. None of those stages are fundamentally about expelling the exhaust gases.

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