# A control system in which the control action is somehow dependent on the output is known as

A control system in which the control action is somehow dependent on the output is known as

### Right Answer is: Closed loop system

#### SOLUTION

• Feedback control systems are also referred to as closed-loop control systems.
• In a closed-loop, the actuating error signal, which is the difference between the input signal and the feedback signal (output signal), is fed to the controller so as to reduce the error and bring the output of the system to the desired value.
• It is desirable that a closed-loop system is not influenced by external disturbances and internal variations in system parameters. The operation of a system may be controlled externally or automatically (by the system itself).
• When the control action of a system is independent of the output, the system is said to be an open-loop control system.
• However, if the control action is somehow dependent on the output, the system is called a closed-loop or feedback control system.
• If the feedback signal is equal to the controlled output, the feedback system is called a unity feedback system.
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