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Practice Listening: Select Missing Word ID: #41093 Short Four-Stroke Engine
Instructions ›
You will see a video explaining the mechanics of how a four-stroke engine operates. At the end of the recording the last word or group of words has been replaced by a beep. Select the correct option to complete the recording.

Transcript:

The engines of most cars operate on a four-stroke cycle. During the four strokes of this cycle, a piston moves down and up inside a cylinder. Valves help control the flow of fuel and air into the engine, and the flow of exhaust out of the engine. The first stroke of the cycle begins with the intake stroke. In this stroke, the intake valve is open and the exhaust valve (is closed).
* Click on the correct answer

Result:

AI explanationShows the answer. Tap to open.
Option 4: "is closed"

Explanation: This option is correct as it directly reflects the information provided in the text. The text states that during the intake stroke, the exhaust valve is closed, which is essential for the proper functioning of the engine during this cycle.

Option 1: "becomes disconnected"

Explanation: This option does not align with the context of the text. The text describes the state of the exhaust valve during the intake stroke, which is not about disconnection but rather its position. Therefore, this option is irrelevant to the information provided.

Option 2: "stays inactive"

Explanation: While this option suggests a state of inactivity, it does not accurately reflect the function of the exhaust valve during the intake stroke. The text specifies that the exhaust valve is closed, which is a specific action rather than a general state of inactivity.

Option 3: "is open"

Explanation: This option contradicts the information in the text. The text clearly states that during the intake stroke, the intake valve is open, but it specifically mentions that the exhaust valve is closed. Therefore, this option misrepresents the state of the exhaust valve.

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