General Layout of a Feedback Control System

• Reduce a block diagram of multiple subsystems to a single block representing the transfer function from input to output.

• Draw the open-loop control system block diagram.

• Draw the closed-loop control system block diagram.

• Compare and contrast open and closed loop control.

• State the principle disadvantage of open-loop control.

• List the advantages of closed loop control.

where G$_1$(s) is a controller or compensator, G$_2$(s) represents a plant model, and H(s) represents the measurement dynamics. Y(s) represents the controlled variable, R(s) represents the reference input, and L(s) represents a disturbance.

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In an open loop control system: (Based on BSNL JE(TTA) Sep 2016-Shift II)

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For open control system which of the following statements is incorrect ?

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A control system in which the control action is somehow dependent on the output is known as: (RSMSSB JE Elec/Mech Dec 2020)

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In open loop system, the control action:

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A good control system has all the following features except: