As relay-based control systems became obsolete, ____ control systems took their place.
A) asynchronous motor
B) stepping motor
C) PLC based
D) solid-state

Question

Quizplus · Accepted Answer

PLC (Programmable Logic Controller) based control systems replaced relay-based control systems as they offer more flexibility and easier programming options. Asynchronous motor and stepping motor are types of motors, not control systems. Solid-state may refer to various electronic devices and is not specific to control systems.

As Relay-Based Control Systems Became Obsolete, ____ Control Systems Took