General

Dear Engineering Students,
I am Shankar, did my M.Tech in Power and Control from IIT Kanpur, B.Tech from JNTU Kakinada Campus and Diploma from Andhra Polytechnic Kakinada.
I worked in General Electric, Hyderabad for 6 years in the field of renewable energy sources. At present, delivering number of lectures in the field of power electronics (since 2007) and delivered lectures in Control systems as well (in the past) especially for GATE/ESE/PSUs. This blog is to explore the various opportunities for electrical engineering students especially preparing for competitive exams. I would like to utilize this blog as platform to share information as much as I can and requesting the continuous feed back for the improvement. I am maintaining this blog after my busy schedule as part of social service and giving back something to the society. If you like it, you can also be part of it

Thanks
BNSS Shankar

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Interview questions - after GATE



Dear students,
Finally I am publishing the most awaited page!!!
I have collected interview questions from so many students from my previous batches and consolidated as below.
Try to get answers from yourself by referring standard text books, have a group discussion among your friends. Do not directly go to teacher without some home work as you may not get the same questions. I want you to get answer on your own by applying fundamentals so that you can expose more deeper into the subject and you can increase your confidence levels. Cracking these exams is very easy if you have confidence with subject knowledge

All the best. Start prepare and sky is the limit!!!
Do not forget to give feedback



ELECTRICAL ENGINEERING – Interview questions
 
IIT Kanpur
Power & Control
·         Questions on control circuits & stability issues.
·         Basics of VSI (Voltage source inverter) in details, its wave form for various types of loads, its analysis for different modes of conduction.
·         Devices (power electronic), their characteristics eg. Difference between a signal and power devices, Bundle conductors, corona losses, surge impedance
·         Induction motor T-S characteristics, Synchronous motors and generators, applications of dc motors.
·         They gave different references & inputs to comparator and ask about the output.
·         They asked circuit diagram of buck, buck-boost and various wave forms.
·         They gave some circuit in which there was freewheeling diode and asked about its operation in detail
·         Equivalent diagram of induction motor and significance of different elements in equivalent diagram.
·         On stability analysis (power system)…. They gave a circuit in which a single line to ground fault had occurred. They asked to draw the swing curve, indicate accelerating and decelerating areas, asked how rotor angle is increased physically, what is the physical meaning of accelerating and decelerating areas.
·         Explain Ferranti effect. They asked in very details about Ferranti effect.
·         Why hydro power generators rotate at slower speed than thermal (steam) generators?
·         Questions on load-flow studies & electric drives, from the basics but tricky.
·         One of the Profs drew a circuit of dc-dc converter and asked to identify that. Be very clear about buck, buck-boost, boost converters, inverters.
·         In control system they asked very basic questions of bode plot, nyquist, polar plot and asked to draw them with a given transfer function (not very tough).
·         They’ll first ask your area of interest. Depending on that they’ll ask questions on that field and related fields. Nevertheless, prepare for the whole syllabus.
·         They’ll ask you to answer each question by drawing circuit, writing equations...etc……on the black board.

IIT Delhi
Power Electronics, Electrical Machines & Drives
·         Questions on Induction motor principles & BE/B.Tech project
·         Draw four quadrant chopper circuit without SCR?
·         Why more than six pulse is used in HVDC converters?
·         Torque-slip characteristics of Induction Motor
·         Questions about switching devices for PE circuits
·         How to select switch based on application?
·         V & inverted V curve of SM.
·         Inverters and Devices in much detail, they used to ask the typical rating of the devices.
·         First they asked about B.Tech project in very much details,
·         They asked about linear system, linear equations……then asked whether Swing equation is linear or not and asked each and every question out of it.
·         Asked other very basic questions from transmission line, distribution system etc.
·         If you hold a good GATE score (/rank) and fairly good SGPA, they will primarily focus on your B.Tech project. If it is not the case, they will ask everything you have read in B.Tech (that was the case with one of my friend).

Control & Automation
·         What are advanced controllers?? (they intended to ask about fuzzy and ANN)
·         Comment on stability of a given Nyquist plot.
·         Parameters in root locus
·         Something about bode plot
·         Basic control system & Lead controller
·         Define stability, and stable system
·         What is impulse response?
·         Linear and nonlinear systems, causal and anti-causal systems
·         Different stability criteria
·         Transfer function definition and why initial conditions are zero while defining transfer function
·         Derive the transfer function for DC motor and draw its block diagram. While answering this question, they will mostly observe your approach

IIT Bombay
Microelectronics (RA)
·         Working of NMOS.
·         Some questions on OP-AMP.
·         Questions mostly on B Tech project

Power Electronics & Power Systems (RA)
·         Some Questions in Mathematics.
·         Draw the full bridge rectifier diagram.
·         Explain commutation process.
·         Questions on basic circuit theory.
·         Questions based on operation and speed control of induction motor, transformer OC and SC test.

Control & Computing (RA)
·         Questions were not from the B.Tech syllabus.
·         Majority were on Computer & its peripherals. ( for  a Network Admin in electrical dept)

IIT Madras
Communication Systems (M.S. RA)
·         Basic questions on DFT, DTFT.
·         Purpose of transforms like DFT, DTFT etc.

Power Electronics
·         They will start with basic concepts of Inductor and capacitor.
·         Most of the questions will be on DC-DC converters and their various quadrants of operation.
·         Explain the basic difference between 4-Q chopper and single phase VSI
·         If we give 3-ph AC supply to IM and TF. Rotation magnetic field will not produce in TF but in IM, it will produce. Explain with phasor diagrams
·          
IIT Kharagpur
Power Electronics
·         Draw torque-slip characteristics of IM and locate the normal stable operating point. Now if the two of the supply terminals suddenly reversed, then where it will shift after t=0+
·         Draw the buck converter circuit diagram and derive output voltage equation from energy conversion principles. If resistor is removed and capacitor is ideal, then what is the output voltage
·         Draw separately exciter DC motor circuit. Now, connect the motor in such a way that it should rotate at half the rated speed at no load. Do not touch field winding as it is constant
·         What is the time constant of 1/(s+1) and give any physical example for such system. Obtain the step response and what is the physical meaning of the response plot
·         Draw series RLC circuit and by taking I as reference, draw phasor diagram for VR, VL, VC, Vtotal


IIT Roorkee
    Written exam
        Imp point: No negative marking.
·         Electrical Drives: Questions on constant power and constant torque drives ...e.g they changed the armature voltage and were asking about the dynamics of the machine.
·          Instrumentation:  Questions on Increasing the range of Ammeter/Voltmeter.
·          Questions on Laplace transform.
·         Control Systems: Bode plot , Stability...(easy questions, just refer Nagarath Gopal and Ogatta books of Control Systems).
·         Application of KCL in a circuit containing inductor and/or capacitor.
·         Switching circuits (capacitor and Inductor transient and steady state concepts).
·         Result was a combination of GATE score & the exam conducted.
·         Direct counseling thereafter.

IISc Bangalore
Electrical Communication Engineering [M.S.]
·         Basic questions on mathematics, signals and system, communication and probability theory
·         Only basic fundamentals and no questions from advanced technology. ( Very strict on fundamentals)
·         Panel often asks to explain things in a physical sense rather than putting some equations and solving them.
For example:         Physically how will you interpret the process of convolution?
·         Syllabus of the interview will be clearly mentioned before the interview.
·         There will be some 5 topics mentioned and out of those one has to select 3 topics and questions will be asked from these topics only.

Electrical Engineering
·         Questions on  B Tech project & electronics.


I wish you all the best.
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