Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

 3 point starter
 4 point starter
All of these
 2 point starter

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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 have very good speed regulation.
  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.

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