Which of the following meters are not used on D.C. circuits______________?
Correct answer: C. Induction meters
- A. Mercury motor meters
- B. Commutator motor meters
- C. Induction meters
- D. None of the above
Explanation
Induction meters depend on alternating flux and the resulting eddy currents, so they cannot operate on steady DC. Commutator-type meters and mercury motor meters can be adapted for DC operation.
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