Discussion
A three-point or four-point starter for a dc motor works by
Answer: B
Correct answer: inserting resistance and removing it as the machine speeds up
The starter puts resistance in series with the armature to limit the initial current, and the operator or an automatic relay cuts it out step by step as the machine accelerates and its back emf grows. The three-point starter also carries a no-volt release and an overload trip; the four-point starter separates the no-volt coil from the field circuit so that field weakening does not trip the starter. Both are superseded in modern drives by converter control of the armature voltage.
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