A lightly loaded three-phase squirrel-cage...

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Question 1 of 205eccefa4bacbc34ba4d48567

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?

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🔍 Key Concepts

• Three-phase induction motor operation and what happens if one phase is lost (single-phasing) • Symptoms of under-voltage / low frequency vs mechanical/electrical faults • Difference between a tripped breaker (no power) and a motor that still hums, overheats, and smokes

💭 Think About

• Compare what would happen to a three-phase motor under each choice: would it still try to start, make noise, and overheat, or would it simply not run at all? • Think about why the motor first vibrated while lightly loaded but still running, then later wouldn’t restart and growled — what kind of electrical problem can cause both stages? • Ask yourself which condition would allow some power to reach the motor (enough to make it hum and overheat), but not allow it to start properly.

✅ Before You Answer

• For each choice, decide: would the motor receive no power at all or partial/abnormal power? • Match the clues: vibration while running, then growling on restart, then overheating and smoking – which fault is most consistent with all three? • Verify that under the correct fault, a three-phase motor can continue to run if already spinning but will struggle or fail to start from rest, drawing high current and overheating.

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