Firefighter Mechanical Aptitude · Question
What is the purpose of the intake stroke in a 4-stroke engine?
During the intake stroke, the intake valve opens, and the piston moves downward, creating a vacuum that draws the fuel-air mixture into the cylinder.
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Question: What is the purpose of the intake stroke in a 4-stroke engine?
Answer options:
- To ignite the fuel-air mixture.
- To expel exhaust gases. ✅ To draw the fuel-air mixture into the cylinder.
- To compress the fuel-air mixture.
Correct answer: To draw the fuel-air mixture into the cylinder.
Explanation: During the intake stroke, the intake valve opens, and the piston moves downward, creating a vacuum that draws the fuel-air mixture into the cylinder.
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Question explanations
- 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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