Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will

 Remain unaltered.
 Reduce.
 Increase.
 Oscillate around the normal speed.

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Electrical Machines
The coil spam

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

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