Q. A 4-point starter is essential for a:
Solution:
The functional characteristics of a 4 point starter are similar to a 3 point starter. Four point starter works as a current controlling device in the deficiency of back EMF while starts running of the DC motor. A four-point starter also works as a protecting device. The main difference between a 4 point starter compared to a 3 point starter is, the holding coil is detached from the shunt-field circuit. After this, Sit is connected in series with the current limiting resistance (R) across the line.
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