Firefighter Mechanical Aptitude · Question
A small gear with 20 teeth drives a larger gear with 60 teeth. If the small gear rotates at 300 RPM, what is the speed of the larger gear?
The speed ratio is inverse to the tooth ratio. (20 teeth / 60 teeth) * 300 RPM = 100 RPM. The larger gear rotates slower.
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Question: A small gear with 20 teeth drives a larger gear with 60 teeth. If the small gear rotates at 300 RPM, what is the speed of the larger gear?
Answer options: ✅ 100 RPM
- 300 RPM
- 600 RPM
- 900 RPM
Correct answer: 100 RPM
Explanation: The speed ratio is inverse to the tooth ratio. (20 teeth / 60 teeth) * 300 RPM = 100 RPM. The larger gear rotates slower.
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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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