The main difference between an AC and a DC generator is that

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A DC generator has a permanent magnet while an AC generator has an electromagnet.

DC generator will generate a higher voltage

AC generator will generate a higher voltage

DC generator has a commutator while an AC generator has slip rings

answer is D.

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Detailed Solution

The main difference between an AC and a DC generator is that a DC generator has a commutator while an AC generator has slip rings.
The difference between an AC generator and a DC generator is the construction. In DC generators, a split-ring type commutator is used to produce a unidirectional current. On the other hand, the AC generator is operated on alternating currents. Thus, the AC generator has slip rings, while the DC generator has a commutator.

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