Electrical Machines
Type of single phase motor having highest power factor at full load is

  split phase.
  shaded pole type.
  capacitor start.
  capacitor run.

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Electrical Machines
The synchronous motor can be started by

  coupling it with a DC compound motor.
  providing damper winding in its rotor circuit.
  any of the above methods.
  coupling it with a small AC induction motor called the pony motor.

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Electrical Machines
In a DC machine

 current and emf in armature are unidirectional
 current and emf in armature are alternating.
 emf in armature conductors and at the terminals is alternating.
 current and emf at the terminals are alternating.

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