The incorrect statement is

Options :
  1. both a.c. and d.c. dynamo have the field magnet
  2. both a.c. and d.c. dynamo have the armature
  3. both a.c. and d.c. dynamo convert the mechanical energy into electrical energy
  4. both a.c. and d.c. dynamo have the slip rings
Answer and Explanation :-

Answer: Option 4

Explanation:

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If children were brought into the world by an act of pure reason alone, would the human race continue to exist? Would not a man rather have so much sympathy with the coming generation as to spare it the burden of existence, or at any rate not take it upon himself to impose that burden upon it in cold blood?
-Arthur Schopenhauer Studies in Pessimism: The Essays