As shown in the illustrated diagnostic setup...

Question 1 / 2066636eed28f7522a1c51db09

Question 1 of 2066636eed28f7522a1c51db09

As shown in the illustrated diagnostic setup checking for a reversed field pole on a ten-pole synchronous motor, if a rotor is being checked after reassembly and the steel bolts repel each other as shown in the illustration, what condition is indicated? Illustration EL-0205

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🔍 Key Concepts

• Relationship between field coil polarity and magnetic poles on a synchronous motor rotor • What it means physically when adjacent poles are the same polarity versus opposite polarity • How the steel bolts’ attraction or repulsion indicates the magnetic condition of the two adjacent poles

💭 Think About

• Look at coils 3 and 4 in the illustration: if the steel bolts on these two poles repel each other, what must be true about the magnetic polarity of those two poles? • On a properly wound ten‑pole synchronous motor, what should the polarity sequence be as you go around the rotor from pole 1 to pole 10? (Think N, S, N, S, …) • If only one coil were reversed versus both being correct, how would that affect the polarity pattern around the rotor and what would the bolts on poles 3 and 4 do?

✅ Before You Answer

• Verify that adjacent poles in a healthy rotor must be opposite polarity (N next to S). • Check whether repulsion of the steel bolts means the two poles are like poles or unlike poles. • Trace the N/S pattern all the way around the rotor for each answer choice and see which pattern matches the observed repulsion between poles 3 and 4.

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Question 1 of 20

Either coil 3 or coil 4 has a reversed polarity

An undetermined coil has reversed polarity

Both coils 3 and coil 4 have the correct polarity

All coils have the correct polarity

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Question 1 / 2066636eed28f7522a1c51db09

Question 1 of 2066636eed28f7522a1c51db09

Back

Question 1 of 20

66636eed28f7522a1c51db09

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

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