Ms. Rani decides to convert her AC generator into a DC generator. Which one of the following she would need to use ?

To convert an AC generator into a DC generator, the essential modification is the use of a split-ring type commutator instead of slip rings.

• AC Generator: It typically uses slip rings and brushes. As the armature coil rotates in a magnetic field, the induced current changes direction every half-cycle, resulting in alternating current.
• DC Generator: By using a split-ring commutator (a ring split into two halves), the connection to the external circuit is reversed at the exact moment the current in the coil reverses direction.
• Function: This mechanical rectification ensures that the current in the external circuit always flows in the same direction, producing Direct Current (DC).

While a stronger magnetic field (Option C) increases the magnitude of the induced EMF and a rectangular loop (Option D) is common to both, only the split-ring commutator changes the output from AC to DC.