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Practice Listening: Multiple Choice, Single Answer ID: #41037 Short A four stroke
Instructions ›
You will see a video explaining how a four-stroke engine, commonly found in automobiles, operates. Listen to the recording and answer the multiple-choice question by selecting the correct response. Only one response is correct.

Transcript:

A four stroke engine, the type of motor found in most automobiles, uses 4 strokes in its power cycle. Intake, compression, power, and exhaust. During the intake stroke, a descending piston sucks in an air and fuel mixture through an intake valve. The valve closes and the piston rises, compressing the air and fuel to an explosive level. The power stroke begins just before the piston reaches the top. When the spark plug ignites this mixture, the resulting explosive force pushes the piston down, which turns the crankshaft. In the last stroke, the exhaust valve opens, the piston rises, pushing out the burned gases until at the top of its stroke the exhaust valve closes. The intake valve then opens, and the four-stroke cycle begins again.

What is the correct sequence of the four strokes in a four-stroke engine as described in the video?

* Listen to the recording and select the correct answer

Result:

AI explanationShows the answer. Tap to open.
Option 3: "Intake, compression, power, exhaust"

Explanation: This option accurately reflects the sequence of the four strokes as described in the text. The text clearly states that the process begins with the intake stroke, followed by compression, then the power stroke, and finally the exhaust stroke, aligning perfectly with this option.

Option 1: "Compression, intake, exhaust, power"

Explanation: This option presents the strokes in an incorrect order. The correct sequence starts with the intake stroke, not compression. Therefore, this option contradicts the information provided in the text.

Option 2: "Intake, power, compression, exhaust"

Explanation: This option incorrectly places the power stroke before the compression stroke. According to the text, after the intake stroke, the next step is compression, making this option logically inconsistent with the described sequence.

Option 4: "Power, exhaust, intake, compression"

Explanation: This option presents the strokes in a completely incorrect order. The power stroke cannot occur before the intake and compression strokes, as the text outlines a specific sequence that begins with intake, making this option factually incorrect.

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