Which of the following methods should be...

Question 1 / 2707066636ef128f7522a1c5233ff

Question 1 of 2707066636ef128f7522a1c5233ff

Which of the following methods should be used to test for an 'open' stator winding coil in a wye-connected AC squirrel cage induction motor?

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Question 1 of 27070

Which of the following methods should be used to test for an 'open' stator winding coil in a wye-connected AC squirrel cage induction motor?

🔍 Key Concepts

• Wye-connected stator windings and how the three phase leads relate to the internal coils • How an ohmmeter reading changes when a coil is open versus intact • The basic purpose and normal use of a growler when testing motor/generator windings

💭 Think About

• Ask yourself: If one stator coil is open, what would you expect to measure between the external motor leads in a wye connection? Would one pair show infinite resistance or just a different value? • Consider what a growler actually detects. Is it usually used to find open circuits, shorted turns, or grounded windings? How does the sound/vibration change? • Think about whether testing between the shaft (rotor) and stator leads can reveal an open in the stator winding or if that mainly checks for grounds/insulation faults.

✅ Before You Answer

• Be clear on the difference between testing between phase leads vs. between shaft and leads and what each test tells you • Verify in your study materials what a growler is primarily designed to detect (open, shorted, or grounded coils) • Confirm how an open coil in a wye-connected three‑phase motor affects the measured resistance across the three external leads

Question 1 of 27070

Which of the following methods should be used to test for an 'open' stator winding coil in a wye-connected AC squirrel cage induction motor?

Use an ohmmeter, placing the test leads across each pair of disconnected motor leads in succession and compare resistances.

Use a growler, listening for noise and vibration levels to increase when the growler blade is positioned over an open stator coil.

Use an ohmmeter, placing one test lead on the shaft and the other to each of the disconnected motor leads in succession and compare resistances.

Use a growler, listening for noise and vibration levels to diminish when the growler blade is positioned over an open stator coil.

Question 1 / 2707066636ef128f7522a1c5233ff

Question 1 of 2707066636ef128f7522a1c5233ff

Which of the following methods should be used to test for an 'open' stator winding coil in a wye-connected AC squirrel cage induction motor?

Back

Question 1 of 27070

Which of the following methods should be used to test for an 'open' stator winding coil in a wye-connected AC squirrel cage induction motor?