As shown in figure "A" of the illustration, with a digital multimeter set up as an ohmmeter, what set of readings would be consistent with an open in phase "C" of the single circuit, wye- connected stator windings as shown? EL-0201
Official USCG Answer & Rule Citation
Correct Answer: Option B — T1 to T2: "OL ohms"; T2 to T3: "OL ohms"; T3 to T1: "1.8 ohms"
In a wye-connected stator, each terminal pair measures through two series windings. An open in phase C breaks the path for T1-T3 and T2-T3, resulting in an 'OL' (open loop) reading. T1-T2 remains intact, showing the combined resistance of the two healthy windings in series, totaling the expected ohmic value.
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