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linear circuit Interview Questions


 

Interview Question in linear circuit

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What is a linear circuit. and can you

please tell me the actual purpose of short-circuiting all the voltage source and open-circuiting the current sourse while solving for the equivalent (Thevenin and Norton) circuit from a complex one.

Superposition theorem

The superposition theorem for electric circuits states that the total current in any branch of a linear circuit equals the algebraic sum of the currents produced by each source acting separately throughout the circuit.

To ascertain the contribution of each individual source, all of the other sources must first be "killed" by:

replacing all other voltage sources with a short circuit (thereby eliminating difference of potential)
replacing all other current sources with an open circuit (thereby eliminating flow of current)
This procedure is followed for each source in turn, then the resultant currents are added to determine the true operation of the circuit. The resultant circuit operation is the superposition of the various voltage and current sources.

How to apply the superposition theorem in a circuit in which i have a current source besides the voltage ones

For a linear circuit, you can analyze the circuit's response to each source independently, and superpose the results. When you do so, you need to properly treat the other sources.

Why is an Op-Amp called a linear circuit

...while it can give only two possible outputs +V sat and - V sat.

Linear Circuits

Hi,

I have an exam coming up in linear circuits. The topics that are going to be covered are: Node-Voltage Method of Analysis, Mesh-Current, Superposition, Thevenin and Norton Theorems, Maximum Power Transfer, Dependent Sources, OP AMP, TIme Varying Sources, Inductance, Capacitance, First-Order Differential Equations, Phasors, Complex Power, and AC Power.

The exam is open note so I can bring anything I want to to it. I was wondering if any of you have any good websites that cover the above material.

Thank you!

M.S. or Ph.D for engineering

I'm presently an undergrad in Computer Engineering (with a focus on digital hardware) and I'm looking at grad school applications now and trying to determine whether it makes sense to apply for the doctoral programs or simply go for the Master's degree. The advise I have found online seems to fall into two primary - contradictory - camps.
1. For engineering, only go for the masters degree, particularly if you're not interested in going into Academics. Otherwise you may price yourself out of the market.
2. Go for the PhD, you'll find it easier to get into schools and get funded.

I'm interested in adding a level of art to what I know, but I also want to deepen my knowledge of the core of EE, namely linear/non-linear circuit theory, feedback systems and analog design (which seems to be an art unto itself). MIT's Media Lab is one such place where this seems like it may be possible, but finding other programs - particularly ones that may provide funding - has been challenging. Would it be wiser to stick to the more traditional EE route (which I do thoroughly enjoy.) or continue on trying to find other programs that are more focused on what I want to eventually do?

So, boiled down - Does it make sense to go for the MS or PhD? and should I focus more closely on programs that fit what I want, or go the more traditional EE route?

EE: Principles amp; Applications by Hambley vs Foundations of Circuits by Agarwal, Which text is better

To be used in an a intro EE class covering Fundamental circuit concepts and analysis techniques. Kirchoff's laws, nodal analysis; independent and dependent sources. Thévenin, Norton equivalent circuits. Transient and AC analysis; speed and power. Phasors, Bode plots and transfer function. Filters and Op-Amps. Graphical methods for nonlinear circuits. Gauss's Law and bandgap. Diode and FET characteristics. Diode and MOSFET circuits. Introduction to basic integrated-circuit technology and layout. Digital signals, logic gates, switching

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