Discussion
The winding resistance of a machine is measured with
Answer: A
Correct answer: a low direct voltage and a sensitive instrument
Winding resistances are fractions of an ohm, so they are measured with direct current - to exclude inductive effects - and a bridge or a four-terminal micro-ohmmeter that eliminates lead and contact resistance. The measurement must be recorded with the winding temperature, since copper resistance changes by about 0.4 per cent per degree.
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