Electrical Machines
For standing a DC motor a starter is required because

  it limits the starting current to a safe value.
None of these
  It starts the motor.
  it limits the speed of the 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 have maximum efficiency and maximum starting torque.
  these are cheaper in cost, simple and rugged in construction.
  they are capable of operation under range of leading and lagging pf.
  they have very good speed regulation.

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