During the power stage, the intake and exhaust valves are?

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Multiple Choice

During the power stage, the intake and exhaust valves are?

Explanation:
In the power stage the combustion pressure needs to act on the piston without leaking away. To do that, both the intake and exhaust valves are kept closed. This seals the combustion chamber so the rapid expansion of the burned air-fuel mixture can push the piston downward and convert chemical energy into mechanical work. If any valve were open, the high-pressure gases could escape or the fresh charge could leak in, reducing pressure, wasting power, and harming efficiency. The intake valve will be closed to stop fresh air from escaping during this stage, and the exhaust valve stays closed to prevent spent gases from leaving until the next exhaust stroke.

In the power stage the combustion pressure needs to act on the piston without leaking away. To do that, both the intake and exhaust valves are kept closed. This seals the combustion chamber so the rapid expansion of the burned air-fuel mixture can push the piston downward and convert chemical energy into mechanical work.

If any valve were open, the high-pressure gases could escape or the fresh charge could leak in, reducing pressure, wasting power, and harming efficiency. The intake valve will be closed to stop fresh air from escaping during this stage, and the exhaust valve stays closed to prevent spent gases from leaving until the next exhaust stroke.

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