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- First Assistant Engineer (Steam-Motor-Gas Turbine Plants (Unlimited)) »
- Q517 - Electrical, Electronic, & Control Engineering
227. If the motor of the illustrated circuit fails to start and gives a loud hum when the start button is pushed, what is most likely the problem
An open overload heater disrupts the motor's power supply, causing it to hum loudly but fail to start due to single-phasing.
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