Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A technician is using a portable grinder to remove rust from a chassis component. The grinding disc is rated for 6,000 RPM, but the technician's grinder operates at 8,500 RPM. What is the immediate consequence of using this disc?
Using a grinding disc at a speed higher than its rated maximum RPM creates excessive centrifugal forces, which can cause the disc to shatter or explode, leading
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Question: A technician is using a portable grinder to remove rust from a chassis component. The grinding disc is rated for 6,000 RPM, but the technician's grinder operates at 8,500 RPM. What is the immediate consequence of using this disc?
Answer options: ✅ The grinding disc could disintegrate, causing serious injury.
- The grinding process will be less efficient due to excessive speed.
- The grinder's motor will overheat quickly.
- The finished surface will be smoother than intended.
Correct answer: The grinding disc could disintegrate, causing serious injury.
Explanation: Using a grinding disc at a speed higher than its rated maximum RPM creates excessive centrifugal forces, which can cause the disc to shatter or explode, leading to severe injury. This is a critical safety hazard. The other options are incorrect as the primary danger is disc disintegration.
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