If a drum switch is placed in the reverse position, which of the following statements is true?

When a drum switch is placed in the reverse position, it effectively changes the direction of the motor by altering the connections between the input line conductors and the terminals of the motor. In the context of a three-phase motor control system, a reverse configuration involves connecting the line conductors in a way that reverses the phase sequence.

The correct statement identifies that L1 connects to T3, L2 connects to T2, and L3 connects to T1. This specific arrangement shifts the phases so that the rotor of the motor spins in the opposite direction. Properly reversing the motor's rotation is critical in applications where the direction of movement needs to be controlled, such as conveyors, fans, or pumps.

Understanding the operation of a drum switch in this context is important. Options that suggest L1 connects to T1, L2 to T2, and L3 to T3 or that all lines are disconnected describe scenarios that do not represent a reversal of motor direction. Similarly, the option indicating that the terminals are permanently locked does not apply in typical motor control situations where the drum switch can change the configuration of connections dynamically.