The essential difference between AC and DC generator is:
AC generator has an electromagnet while DC generator has permanent magnet.
DC generator will generate high voltage.
AC generator will generate high voltage.
AC generator has slip rings while DC generator has a commutator
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Correct option is D)
The only difference between AC generator and DC generator is the way the two ends of the generator coil are linked to the outer circuit if we replace slip rings of AC generator by a commutator, then it becomes DC generator.