Read the following statement and give the correct answer 

The split-ring type commutator is used in generators to:

The split ring type commutator is used in generators to convert AC to DC.

Direct current always flows in one direction but the alternating current reverses its direction periodically.
Split rings are also called commutators. Since the direction of the current in a coil is reversed after each half-turn, they are utilized in DC electric motors to provide a constant current to the windings, which will produce a constant torque.