When the armature of a DC motor rotates, emf induced is in machine is called as ___________(a) Self-induced emf(b) Mutually induced emf(c) Back emf(d) Cannot be determinedI had been asked this question in quiz.The above asked question is from Speed Control Using Armature Control in DC Motor topic in division DC Motors of DC Machines

When the armature of a DC motor rotates, emf induced is in machine is

1.	When the armature of a DC motor rotates, emf induced is in machine is called as ___________(a) Self-induced emf(b) Mutually induced emf(c) Back emf(d) Cannot be determinedI had been asked this question in quiz.The above asked question is from Speed Control Using Armature Control in DC Motor topic in division DC Motors of DC Machines
Answer» Right option is (c) Back emf For explanation I would SAY: According to terminology used in DC MACHINES, emf INDUCED in a machine when armature rotates is CALLED as back emf. This back emf value is directly proportional to the SPEED of the motor.

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