Which statement is true about line impedance starters?

Line impedance starters are designed to limit the starting current of induction motors by introducing impedance in the form of resistors, reactors, or other components in the starting circuit. This impedance not only reduces the starting current but also affects the starting torque produced by the motor.

The correct answer regarding line impedance starters is that they yield a lower starting torque. This occurs because the impedance reduces both the voltage and the current supplied to the motor at startup, leading to a decrease in the starting torque. This is a significant characteristic of line impedance starters and is essential to understand in power engineering, as it affects motor performance and selection in various applications.

Considering the context of other options, while line impedance starters are beneficial in managing starting currents, they are typically not designed to provide high starting torque, which is contrary to the high-torque requirement of some applications. The cost aspects of these starters can vary based on the components used, making the assertion of being relatively less expensive typically situational rather than a definitive trait. Lastly, installation effort can vary significantly depending on the specific system and setup, so it's not accurate to claim that they require minimal installation effort universally.