A: It is any system where there is negative feedback to control its behavior
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A Closed loop system basically will have a feedback which enables the rectification of the error in the main process,whereas it is not possible in an open loop system
closed loop system
Sensitivity of a closed loop system for a change in the system gain is 1/(1+GH)
The closed loop control refers to a system whereby an input forcing function is usually determined in part by the system response.
A typical sump pump just sits there and does nothing until a sensor detects that sufficient water is present to turn on. If it just pumped forever it would be open loop. The fact that it also senses when the water has been pumped and stops makes it a closed loop system. If you're referring to the water in the system, it is an open loop system, since the water is not held in the system.