When testing the rotor of a synchronous...

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Question 1 of 205eccefa4bacbc34ba4d48533

When testing the rotor of a synchronous motor for short circuits, a low voltage source is applied across the rotor coils through the collector rings. What would be the indication of a short-circuited coil?

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🔍 Key Concepts

• Synchronous motor rotor testing with a low-voltage source across the slip (collector) rings • How voltage drop behaves across a normal (healthy) coil versus a short-circuited coil • Relationship between resistance of a coil and the measured voltage drop across it when current flows

💭 Think About

• Think about what happens to the resistance of a coil if it becomes short-circuited. Does the resistance go up or down? • If several coils are in a similar test setup and one has much lower resistance, what will the voltage drop across that particular coil look like compared to the others? • Which choice best matches the expected voltage reading pattern for one bad (shorted) coil among several good coils?

✅ Before You Answer

• Recall Ohm’s law and verify: for a given current, higher resistance = higher voltage drop; lower resistance = lower voltage drop. • Compare each option to the idea that a short circuit effectively bypasses turns of the winding, changing resistance and therefore the voltage drop. • Check that the correct option describes one coil behaving differently from the others in a way consistent with a short circuit (not just fluctuation or instability).

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