Heavy Duty Equipment Technician Red Seal Exam Prep · Question
In a heavy-duty mining truck, if the planet carrier is the input, the sun gear is output, and the ring gear is held stationary, what type of speed relationship will result compared to the input speed?
When the planet carrier is input, the sun gear is output, and the ring gear is fixed, the gear set operates as a speed increase or overdrive. This configuration
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Question: In a heavy-duty mining truck, if the planet carrier is the input, the sun gear is output, and the ring gear is held stationary, what type of speed relationship will result compared to the input speed?
Answer options: ✅ Speed increase (overdrive)
- Speed reduction
- No change in speed (direct drive)
- Reverse rotation
Correct answer: Speed increase (overdrive)
Explanation: When the planet carrier is input, the sun gear is output, and the ring gear is fixed, the gear set operates as a speed increase or overdrive. This configuration forces the smaller sun gear to rotate faster than the input carrier.
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