1378. 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.

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