Electrical Machines
Which of the following is/are not a self starting motor?

 both 1 and 2
None of these
 3-phase induction motor
 1-phase induction motor

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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.
  they have maximum efficiency and maximum starting torque.
  these are cheaper in cost, simple and rugged in construction.
  they have very good speed regulation.

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Electrical Machines
Which of the following represents the commutator pitch?

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

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