Question

The essential difference between a d.c. dynamo and an a.c. dynamo is that

• A. a.c. has an electromagnet but d.c. has a
  permanent magnet
• B. a.c. will generate a higher voltage
• C. a.c.has slip rings but the d.c. has a commutator
• D. a.c. dynamo hyas a coil wound on soft iron,
  but the d.c. dynamo has a coil wound on copper

Answer 1

The correct option is C a.c.has slip rings but the d.c. has a commutator

The a.c dynamo has step rings because it changes polarity in every half cycle.