Control Systems Basics of Control Systems Closed Loop Control Systems

Which of the following statements about the closed-loop control system compared to open-loop control system is INCORRECT?

1
The feedback reduces the overall gain of the system.
2
Stability is not a major problem, and less care is needed to design a stable close-loop system.
3
The changes in the output due to external disturbances are corrected automatically. So, they are less sensitive to noise and other disturbances.
4
The closed-loop systems are accurate and reliable.

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