Machine-translated by Google. Questions are authored in English.
Top

Discussion

As load is applied to a dc series motor, its speed behaves in what way?

  • A.is independent of the current the machine draws
  • B.falls steeply
  • C.rises steadily as the load current increases
  • D.remains almost exactly constant whatever the load

Answer: B

The flux rises with the armature current, and the speed varies inversely with flux, so the characteristic falls away sharply. Combined with a torque rising as the square of the current, that makes the machine a natural traction motor.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.