Engine : Electricity - 646/1386
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| A lightly loaded three-phase squirrel-cage induction motor, while running, begins to vibrate excessively but continues to run. After shutting down the motor, the motor will not restart, but makes growling noises, overheats, and smokes. What caused this? |
| A) The motor tripped-out on under load. |
| B) The branch circuit breaker tripped open. |
| C) The source voltage or frequency was too low. |
| D) One of the lines feeding the motor has an open phase, resulting in single-phasing. |
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