Electrical Engineering Technical Interview Questions

What is Electrical Engineering?

The field of engineering is a very popular field of study and a very profitable one at that as well. Many parents in fact try to push their children toward engineering regardless of whether or not they are interested in the field themselves. Nevertheless, many students take up this field of engineering which is primarily divided into these three segments: Electrical Engineering, Mechanical Engineering, and Civil Engineering.

In the simplest of terms, Electrical Engineering is a field of engineering that mainly deals with the study and application of electricity, as well as the application of electronics, and electromagnetism. Additionally, it also deals with power, control systems, telecommunications and signal processing. The main focus of Electrical Engineering is to utilize electricity to transmit energy, and effective usage of that energy.

What is a System?

A system is the basis of electrical engineering. Without it, it can be very hard to achieve anything in electrical engineering. A system is basically a group of things that come together and work as a whole together to achieve something. In the context of electrical engineering, a system is a group of elements or components that are connected in a sequence, so as to perform a specific function.  

What is Control System?

A system is basically a group of things that come together for a common purpose. In terms of electrical engineering, a system is a group of elements or components that are connected in a sequence, so that they may perform a specific function.

A control system is a specific type of system that manages commands, directs or regulates the behavior of other devices or systems. Here, the output and inputs are interrelated; they are connected in such a way so that the output quantity or variable is controlled by input quantity or variable. In a control system, the output quantity is called controlled variable or response, while the input quantity is called command signal or excitation.

What are different types of Control Systems?

A control system is a specific type of system that manages commands, directs or regulates the behavior of other devices or systems. Here, the output and inputs are interrelated. Here, they are connected in such a way so that the output quantity or variable is controlled by input quantity or variable. There are two main types of control systems:

1. Open loop Control System: The open loop control system is one in which the output process has no effect on the control action. Here, the output quality is independent of the input quality.

2. Closed Loop Control Systems: In the closed loop control system, the control action from the controller is dependent on the desired and actual process output values. Here, the feedback is provided from the Output quantity to the input quantity for the correction so as to maintain the desired output of the system.

What is a feedback in Control System?

A control system is a specific type of system that manages commands, directs or regulates the behavior of other devices or systems. In a control system, the feedback is where the output is sampled and the proportional signal is fed back to the input. This is done so that if there is an error it can be fixed, hence resulting in further processing to get the desired output.

What are the components of feedback control system?

Control systems are essential in controlling other systems. The components of the feedback control system include plant, feedback path elements, error detector and controller.

Why is Negative Feedback preferred in the Control System?

Negative Feedback occurs when some function of the output of a system, process, or mechanism is fed back in a manner that tends to reduce the fluctuations in the output. It is primarily caused by either changes in the input or by other disturbances.

It is preferred as it results in better stability in a steady state, eventually promoting it to equilibrium. It also rejects any disturbance signals and reduces the effects of perturbations. It also has low sensitivity to parameter variations. Negative feedback loops in which just the right amount of correction is applied with optimum timing can be very stable, accurate, and responsive.

What are the characteristics of negative feedback?

Negative Feedback is characterized via 4 traits

  • Accuracy in tracking steady state value.
  • Rejection of disturbance signals.
  • Low sensitivity to parameter variations.
  • Reduction in gain at the expense of better stability
What is the effect of positive feedback on stability of the system?

Positive feedback occurs in a feedback loop when the effects of a small disturbance on a system include an increase in the magnitude of the perturbation, Basically, it is when ‘A produces more of B which in turn produces more of A’

Positive feedback tends to lead to instability. It promotes exponential growth, oscillation or chaotic behavior. Negative feedback, on the other hand, generally promotes stability.

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