Question

give differences between split ring commutator and slip ring commutator ( at least 3 )

Answer 1

"A split-ring commutator makes the current change direction every half-rotation, whereas a slip-ring commutator merely maintains a connection between the moving rotor and the stationary stator."

So, slip rings are useful for DC motors where the current has to change direction every half revolution whereas split rings are used to make constant current connection to a commutator, which is what you want for an AC motor.

Answer 2

In an AC generator ,we use slip rings- Full rings
with which end of coil are in contact
DC generator uses split rings- half rings with which the ends of the armature coil are in contact
sl ip rings are made up of graphite

Split ring are made up of carbon