Discussion
Match the test with what it finds.
1. Growler 2. Bar-to-bar test 3. Polarisation index
P. Moisture in the insulation Q. A short-circuited coil R. An open or high-resistance coil
Answer: A
Correct answer: 1-Q, 2-R, 3-P
Three tests for three quite different faults. The growler detects a short-circuited coil by the circulating current the applied field induces in it. The bar-to-bar test measures the resistance between adjacent commutator segments and finds an open or high-resistance coil as an anomalous reading. And the polarisation index reveals moisture and contamination in the insulation.
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