Electrical Machines
An IM cannot run at synchronous speed because

  air friction will prevent it.
  rotor torque will not be produced.
  none of above.
  induction motor will become synchronous motor.

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

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