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A fan typically runs at 500 RPM is modified to run at 1000 RPM? This causes the amplitude of vibration at 1x RPM to increase

A fan typically runs at 500 RPM is modified to run at 1000 RPM? This causes the amplitude of vibration at 1x RPM to increase from .2 in/sec to .8 in/sec. What is probably causing this increased vibration amplitude? A) resonance around 1000 cpm B) resonance around 500 cpm C) defective bearings D) Imbalance

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