AG Mechanics CDE Practice Exam

If the intake valve fails in a one-cylinder engine, the engine will:

1. continue running but with less power

2. reduce its fuel efficiency

3. run with increased noise

4. stop

The correct answer is: continue running but with less power

If the intake valve fails in a one-cylinder engine, the engine will continue running but with less power. The intake valve is responsible for allowing the air-fuel mixture into the cylinder for combustion. If it fails, less air-fuel mixture will enter the cylinder, resulting in incomplete combustion and decreased power output from the engine. This is why the correct answer is that the engine will continue running but with less power. Option B is incorrect because a failed intake valve will not necessarily reduce fuel efficiency significantly. Option C is incorrect as the noise level of the engine is not directly affected by a failed intake valve. Option D is incorrect as the engine will not immediately stop running if the intake valve fails.