SOLUTION

An automatic toaster is an open loop control system.

Detailed Explanation

Automatic toaster system:

In this system, the quality of toast depends upon the time for which the toast is heated.  In an automatic toaster, bread is one of the inputs while the timer which it has to be operated is another input. Depending on the time setting, bread is simply heated in the system. The quality of the toast is the output and once the timer is initiated the action is completed without changes resulting from errors in the toasting quality. The toast quality is judged by the user and has no effect on the input, therefore, the output has no effects on the input. Hence the automatic toaster is an open-loop system.