The automatic control of system (or machine) is a very accurate and effective means to perform desired function by the system in which the human operator is replaced by a device there by relieving the human operator from the job thus saving physical strength. The automatic control systems are also called as self-activated systems.
The centrifugal actuated ball governor which controls the throttle valve to maintain the constant speed of an engine is an example of an automatically controlled system.
The automatic control systems are very fast, produces uniform and quality products. It reduces the requirement of human operators thus minimizing wage bills.
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