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(D) motor starter is primarily used to limit the high starting current in a $DC$ motor. $1$. It acts as a variable resistor connected in series with t

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All of these

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(D) motor starter is primarily used to limit the high starting current in a $DC$ motor. $1$. It acts as a variable resistor connected in series with the armature to restrict the initial current flow. $2$. As the motor gains speed,the back $emf$ $(E_b)$ increases,which naturally opposes the supply voltage. The starter allows for the gradual removal of resistance as the back $emf$ builds up,thereby offsetting variations in the back $emf$ during the acceleration phase. $3$. Therefore,it is essential for the safe starting of a $DC$ motor. Since all the given statements are correct,the correct option is $D$.

$A$ motor starter:

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