Firefighter Mechanical Aptitude · Question
In a four-stroke internal combustion engine, which stroke immediately follows the combustion (power) stroke?
The four strokes are intake, compression, power (combustion), and exhaust. After the power stroke, the exhaust valve opens, and the piston moves up to expel the
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Question: In a four-stroke internal combustion engine, which stroke immediately follows the combustion (power) stroke?
Answer options:
- Intake stroke
- Compression stroke ✅ Exhaust stroke
- Ignition stroke
Correct answer: Exhaust stroke
Explanation: The four strokes are intake, compression, power (combustion), and exhaust. After the power stroke, the exhaust valve opens, and the piston moves up to expel the spent gases during the exhaust stroke.
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- Scenario 1: Which simple machine uses a fulcrum to multiply force or change the direction of force?
- Scenario 2: If a hydraulic jack has a small piston with an area of 5 cm² and a large piston with an area of 50
- Scenario 3: Which of the following would require the MOST force to move?
- Scenario 4: A rope is tied to a heavy box. Instead of pulling the box directly, a firefighter wraps the rope a
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