Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Draw too much current.
 Produce sparking at brushes.
 Open fuse or circuit breaker.
  Develop excessive speed and damage itself.

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Electrical Machines
For a given torque, reducing divertor resistance of a DC series motor

  Decrease in speed demanding less armature current.
  Increase in speed demanding more armature current.
  Decrease in speed but armature current remains the same.
  Increase in speed but armature currnet remains the same.

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Electrical Machines
The armature mmf of a DC machine has

  triangular space distribution and is stationary in space.
 stepped distribution and rotates at the speed of armature.
  trapezoidal space distribution and is stationary in space.
  triangular space distribution and rotates at the speed of armature.

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