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The essential difference between an AC generator and a DC generator is that
a. AC generator has an electromagnet while a DC generator has permanent magnet.
b. DC generator will generate a higher voltage.
c. AC generator will generate a higher voltage.
d. AC generator has slip rings while the DC generator has a commutator.

Vinay

d. AC generator has slip rings while the DC generator has a commutator.

The slip rings are two rings on AC generators, while the commutator is two half rings on DC generators. This is the primary distinction between an AC and a DC generator.