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 conductors spanned by one coil at the back end of the armature.
 Number of commutator segments between two successive coils.
 Number of conductors spanned by one coil at the front end of the armature.

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Electrical Machines
The 3 - Φ induction motors are, by a very considerable margin, the most widely used AC motors as

  they are capable of operation under range of leading and lagging pf.
  these are cheaper in cost, simple and rugged in construction.
  they have very good speed regulation.
  they have maximum efficiency and maximum starting torque.

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