If a single-phase capacitor start induction...

Question 1 of 270705eccefa4bacbc34ba4d48215

If a single-phase capacitor start induction motor fails to start, but instead hums without starting, what is most likely to be the problem?

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Question 1 of 27070

Q

If a single-phase capacitor start induction motor fails to start, but instead hums without starting, what is most likely to be the problem?

🔍 Key Concepts

• Starting circuit of a single-phase induction motor • Role of the start capacitor and auxiliary (start) winding • Symptoms of line power problems vs motor internal problems

💭 Think About

• Which component is only used during start and, if open, would prevent the motor from developing starting torque but still allow it to hum? • How would a tripped breaker or blown fuse affect the supply to the motor—would the motor still make any noise? • What would a shorted centrifugal switch tend to cause during or after start: no power, continuous start winding operation, or completely dead motor?

✅ Before You Answer

• Confirm whether line power is present to the motor—would a fuse or breaker problem allow humming? • Identify which choice directly affects the starting (auxiliary) winding circuit rather than the main power feed. • Think about what condition allows the main winding to energize (causing humming) while preventing the start winding from doing its job.