Functions of commutator in d.c. machines

Q.  Functions of commutator in d.c. machines are
- Published on 19 Oct 15

a. To facilitate the collection of current from armature conductors
b. To convert internally developed induced emf to unidirectional emf
c. To produce unidirectional torque in case of motors
d. All of these
e. None of these

ANSWER: All of these

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