Troubleshooting Three-Phase Induction Motor Starting and Running Problems Quiz

Excessive humming sound and no rotation. — Humming indicates voltage is present but rotor isn't turning, likely due to a fault.

All of the above. — Any of these can cause a reduction in the motor's speed, leading to performance issues.

Both b and c. — Both a shorted rotor and an oversized load lead to excessive current during start-up.

The motor's current draw. — Excessive current draw often leads to overheating of the motor windings and components.

An ohmmeter. — An ohmmeter will show infinite resistance across an open circuit winding.

easy 5 Questions

Question 1 of 5

Which of the following is a common symptom of a three-phase induction motor failing to start?

Humming indicates voltage is present but rotor isn't turning, likely due to a fault.

Question 2 of 5

Any of these can cause a reduction in the motor's speed, leading to performance issues.

Question 3 of 5

Both a shorted rotor and an oversized load lead to excessive current during start-up.

Question 4 of 5

Excessive current draw often leads to overheating of the motor windings and components.

Question 5 of 5

An ohmmeter will show infinite resistance across an open circuit winding.

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