Posts
ELECTRICAL ENGINEERING
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.
- Questions on B Tech project & electronics.
IIT Roorkee
- Written exam
- Imp point: No negative marking.
- Electrical Drives: Questions on constant power and constant torque drives ...e.g they changed the arm voltage and were asking the change in current.
- Instrumentation: Questions on Increasing the range of Ammeter/Voltmeter.
- Questions on Laplace transform.
- Control: Bode plot , Stability...(easy questions, just refer BS Manke of Control Systems).
- Application of KCL in a circuit containing inductor and/or capacitor.
- Switching circuits (capacitor initially short and finally open circuited type).
- Result was a combination of GATE score & the exam conducted.
- Direct counseling thereafter.
IIT Kanpur
Power & Control
- Questions mostly on control circuits & stability issues.
- Basics of VSi (Voltage sourse 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 mos
- 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 deccelerating areas, asked how rotor angle is increased physically, what is the physical meaning of accelerating and deccelerating areas.
- Explain Ferranti effect. They asked in very detaile abot Ferranti effect.
- Why hydel 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 queations 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.
Display Technology & VLSI
- Physics of PN Junction diode.
- About Differential amplifiers.
- Questions on circuit, various electronic devices like MOSFET, JFET.
- Comparison of Logical Families.
- A basic digital circuit question based on binary logic.
- Some log conversion.
- Board Question based on CMOS Body effect (its disadvantage, Vm derivation).
Signal Processing, Communication & Networking
- Basics from Digital Communication and Signal & Systems but all questions are mathematical.
- Board Interview.
- Why you want to do Mtech?
- Questions related to work experience (if applicable).
- Questions on Low Pass filter.
- Draw the diagram using R and c components
- Derive transfer function
- Plot frequency response on bode plot
- Interchange R and C and repeat above three steps
- What is cut off resonance
- Questions on DSP.
- For a finite impulse response calculate the first and DFT coefficient
- Relation between DFT and DTFT coefficient
- Questions on FM.
- Write the equation of FM wave
- Relation between PM and FM. Show using block diagrams
- What is indirect FM generation? Mathematically calculate the value of carrier frequency for 3 step FM generation for given multiplication factor at each stage.
IIT Delhi
Power Electronics, Electrical Machines & Drives
- Questions on Induction motor principles & BE project
- Draw four quadrant chopper circuit?
- Why 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.
- Inverteres.
- Devices in much detail, They asked me the typical rating of the devices.
- I had my final yr. project on HEVs so they asked me a lot from HEV, like motors suitable for the design.
- Bidirectional DC DC converters.
- 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 queation 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 focuss on yout B.Tech project. If it is not the case, they will ask every thing you have read in B.Tech (that was the case with one of my friend).
Integrated Electronics & Circuits
- Basics of Differential Amplifier
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
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 OCC and SCC 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.
