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Question

Which of the following statements correctly elucidates the difference between an A.C. and a D.C. generator? Statement I: An A.C. generator has commutator and a D.C. generator has slip rings. Statement II: An A.C. generator has slip rings while a D.C. generator has commutator. Statement III: A.C. generator rotates only in one direction. Statement IV: The polarity of the current changes for every half rotation in a D.C. generator.

A
Only II
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B
I and III
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C
I, II and III
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D
Only IV
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Solution

The correct option is A Only IIIn an A.C. generator, the two ends of the coil are connected to two full rings of copper called slip rings. In a D.C. generator, the two ends of the coil are connected to a commutator consisting of two half rings of copper. Thus, option A is the correct answer.

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