The essential difference between an AC generator and a DC generator is that.
The essential difference between an AC generator and a DC generator is that
(i) AC generator has an electromagnet while a DC generator has permanent magnet.
(ii) DC generator will generate a higher voltage.
(iii) AC generator will generate a higher voltage.
(iv) AC generator has slip rings while the DC generator has a commutator.
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AC generator has slip rings while DC generator has a commutator. So, choice (iv) is correct.
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