Discussion
Linear commutation means the current in the commutating coil
Answer: C
Correct answer: reverses uniformly through the commutation period
Linear commutation is the ideal: the current changes at a constant rate and reaches its full reversed value exactly as contact is broken, so no energy remains in the coil’s inductance and no arc is drawn. Real commutation lags behind this because of the reactance voltage the reversal itself induces.
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