Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 1500 rpm
 375 rpm
 3000 rpm
 75 rpm

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Electrical Machines
The coil spam

 can never be equal to pole pitch.
 must be exactly equal to people pitch.
 none of above.
  may or may not be exactly equal to people pitch.

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