Question

Which of the following is NOT the advantage of closed-loop control systems?
1. They are more accurate
2. The speed of the response can be greatly increased
3. They require lower forward path gains
4. The effect of external disturbance signals can be made very small.

Answer 1

Correct Answer - Option 3 : They require lower forward path gains

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.