09․ The output of the system has an effect upon the input quantity, then the system is a
open loop control system.
closed loop control system.
either 1 or 2.
none of the above.

Control system in which the output has an effect upon the input quantity in order to maintain the desired output value is called closed loop control system. The open loop system can be modified as closed loop system by providing a feedback. The provision of feedback automatically corrects the changes in output due to disturbances. Hence the closed loop control system is also called as automatic control system.

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