Discussion
To raise the steady speed of a drive against an unchanged load, the motor characteristic must be
Answer: A
Correct answer: shifted so that it crosses the load curve higher up
The operating point is the intersection of the two curves, and the load curve is fixed, so the intersection can only be moved by moving the motor characteristic - by raising the armature voltage, weakening the field, or changing the supply frequency according to the machine. Making the characteristic steeper without shifting it changes the regulation but leaves the crossing point where it was.
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