Question

Guess what will happen if there is no split ring commutator in electrical motor.​

Answer 1

Explanation:

Without a split ring commutator the current would not reverse when armature reverses, and the magnetic fields of the rotor and stator would clash and the rotor will stick in a position and not turn.

Answer 2

The motor passes through this zero torque point every rotation (or actually twice if you have the split ring commutator). It can be problem because - at this time the motor is providing no torque - i.e. not doing its job and, if the motor is in this orientation when you try and start it it won't go.