Electrical Machines
Which of the following are variable losses?

 shunt field copper loss
 hysteresis loss
 armature copper loss
 eddy current loss

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Electrical Machines
Which of the following represents the commutator pitch?

 The distance between the staring of first coil and its next successive coil
 Number of commutator segments between two successive coils.
 Number of conductors spanned by one coil at the front end of the armature.
 Number of conductors spanned by one coil at the back end of the armature.

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