During high-speed operation in a primary-resistance starter, resistors are shunted out of the circuit to achieve what?

In a primary-resistance starter, resistors are initially included in the circuit to limit the inrush current during motor start-up. This is particularly critical because the starting current can be significantly higher than the normal running current. As the motor accelerates and approaches its operational speed, the resistors are shunted out of the circuit, which serves to minimize energy loss.

When the resistors are bypassed, the circuit allows the motor to run more efficiently at high speeds, reducing the heat generated by the resistors due to the current passing through them. This transition effectively optimizes the performance of the motor and minimizes wasted electrical energy, which would otherwise be converted into heat. Therefore, shunting out the resistors during high-speed operation is crucial for maximizing efficiency and ensuring that more energy is used in performing mechanical work rather than lost as heat in the resistors.

The other options do not accurately describe the primary purpose of shunting resistors in this context. Increasing resistance or enhancing voltage does not align with the operational goals of a primary-resistance starter at high speeds, as doing so would disrupt the motor's performance. Stabilizing current flow may be a factor during start-up, but once the motor reaches high speed, the focus is on efficiency