AG Mechanics CDE Practice Exam

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Prepare for the AG Mechanics CDE Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

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On the __________ stroke of an engine, the piston is going up, one valve is open and the other valve is closed and the fumes are leaving the cylinder.

  1. compression

  2. exhaust

  3. intake

  4. power

The correct answer is: compression

The other options are incorrect because they do not accurately describe the process being discussed.The compression stroke is when the air/fuel mixture is being compressed by the upward motion of the piston in preparation for the power stroke. The exhaust stroke is when the burnt fumes are being expelled from the cylinder, the intake stroke is when the piston is moving downward and the intake valve is open, allowing the air/fuel mixture to enter the cylinder, and the power stroke is when the compressed air/fuel mixture is ignited, pushing the piston down with force. Therefore, the compression stroke is the only logical option.

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