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Consider the following statements regarding the advantages of closed loop negative feedback control systems over open loop systems:

1. The overall reliability of the closed loop systems is more than that of open loop system.

2. The transient response in the closed loop system decays more quickly than in open loop system.

3. In an open loop system, closing of the loop increases the overall gain of the system.

4. In the closed loop system, the effect of variation of component parameters on its performance is reduced.

Of these statements are correct.
1. 1 and 3
2. 1 and 2
3. 2 and 4
4. 3 and 4

1 Answer

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Best answer
Correct Answer - Option 3 : 2 and 4
 

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 Nonfeedback 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.

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