Question

Which of these is true about an open loop system vs closed loop system:

Select one:
Open loop system provides better control in the presence of environmental disturbance
Closed loop systems are comparatively cheaper as they require less components & design effort
A kitchen toaster is a closed loop system
An open loop system can be made closed loop by introducing feedback and controlling

Answer 1

Control systems are used to arrange and manage components in a way that the required condition or output is obtained. The word ‘control’ itself shows the command over any system. It is controlled when the systems is stable.

There are two attributes of control system:

StabilityDesired output

A control system can be functioned electrically, mechanically, pressure by fluid (gas or liquid), or it can be combination of these ways. In the preceding tutorial we introduced control systems, their principle of working, the variables involved in the functioning of control systems and the basic types.

In this tutorial we will be conferring over the major types of control systems namely: Open loop systems and closed loop systems. The tutorial will deal with the chief differences between the two types. Let’s have a look on the basic working of the two systems:



Open loop control systems



An open-loop control system takes input under the consideration and doesn’t react on the feedback to obtain the output. This is why it is also called a non-feedback control system.

There are no disturbances or variations in this system and works on fix conditions.


Closed loop control systems



A closed loop system is also referred as a feedback control system. These systems record the output instead of input and modify it according to the need. It generates preferred condition of the output as compared to the original one. It doesn’t encounter any external or internal disturbances.


Differences between Open-loop and Closed-loop control systems



These two types of control system have contrast with each other. They have dissimilarities some of which are discussed below:

Effect of output

– An open loop control system acts completely on the basis of input and the output has no effect on the control action.

– A closed loop control system considers the current output and alters it to the desired condition. The control action in these systems is based on the output.

Answer 2

The answer is Option 4.

An open loop control system is a system for which the control action is not dependent on the system’s output. In a closed loop control system, the output affects the input quantity that in turn adjusts itself depending on the output generated. Among the given statements, the following is true about an open loop system vs closed loop system:

An open loop system can be made closed loop by introducing feedback and controlling.