Consider the following statements regarding the advantages of closed-loop negative feedback control systems over open-loop systems:
- The overall reliability of the closed-loop systems is more than that of the open-loop systems.
- The transient response in the closed-loop system decays more quickly than in the open-loop system.
- In an open-loop system, closing the loop increases the overall gain of the system.
- In the closed-loop system, the effect of variation of component parameters on its performance is reduced.
Right Answer is:
B and D
Open Loop Control System:- When the control action of a system is independent of the output, the system is said to be an open-loop control system.
Closed-loop Control System:- If the control action is somehow dependent on the output, the system is called a Closed-loop or Feedback control system.
Difference Between Open-loop and Closed-Loop Control System
|Open Loop Control System||Closed-Loop Control System|
|In this system, the controlled action is free from the output||In this system, the output mainly depends on the controlled act of the system.|
|This control system is also called a Non-feedback control system||This type of control system is also called a feedback control system|
|The components of this system include a controlled process and controller.||The components of this kind of system include an amplifier, controlled process, controller, and feedback|
|The construction of this system is simple||The construction of this system is complex|
|The accuracy of this system mainly depends on the calibration||These are accurate due to feedback|
|The stability of these systems are stable||The stability of these systems are less stable|
|Sensitivity high||Less sensitive|
|The optimization in this system is not possible||The optimization in this system is possible|
|The transient response decay slowly||The transient response decay fast|
|The calibration of this system is difficult||The calibration of this system is easy|
|The disturbance of this system will be affected||The disturbance of this system will not be affected|
|These systems are non-linear||These systems are linear|
|The best examples of this control system are automatic washing machine, traffic light, TV remote, immersion rod, etc.||Examples of this kind of control system are AC, control systems for temperature, pressure and speed, toaster, and refrigerator|