Dear students,

Finally I am publishing the most awaited page!!!

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 V

_{R}, V_{L}, V_{C}, V_{total}**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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