Draw a component block diagram for each of the following feedback control systems.
(a) The manual steering system of an automobile
(b) Drebbel's incubator
(c) The water level controlled by a float and valve (d) Watt's steam engine with fly-ball governor In each case, indicate the location of the elements listed below and give the units associated with each signal.
• The process
• The process desired output signal
• The sensor
• The actuator
• The actuator output signal
• The controller
• The controller output signal
• The reference signal
• The error signal
Notice that in a number of cases the same physical device may perform more than one of these functions.