Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  synchronous motor.
  capacitor run IM.
  repulsion motor type starting.
  transformer with short-circuited secondary.

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Electrical Machines
A belt-driven cumulatively-compound dc generator is delivering power to the dc mains. If the Belt snaps then the machine will run as a

 differentially compounded motor in the same direction
 cumulative compounded motor in opposite direction
 differentially compounded motor in the opposite direction
 cumulative compounded motor in the same direction

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