From our research
What this interview looks like
In an Indian engineering college, every lab course ends in a practical examination where the student performs one experiment or writes one program and then faces a viva voce from an internal examiner and, in the end-semester university exam, an external examiner appointed by the university. The viva typically lasts five to fifteen minutes per student, and the examiner opens the lab record or the just-completed experiment and asks the student to explain the setup, the readings, the theory behind them and what would change if a condition changed. The final-year project viva is longer: a panel of the guide, an internal examiner and an external examiner, often from industry, hears a presentation and demo and then questions each team member on the problem, design choices, their own module and the results. Marks for the viva are set by the university scheme and usually form a part of the practical or project marks, with the exact split varying by university. The ExamPilot mock compresses this into a twelve-minute viva with one examiner who opens your record, probes one subject in depth, tests what-if reasoning on a scenario from the lab or project, and closes without revealing marks.
How it is weighted
The viva is one component of the practical marks along with the circuit connected, the readings taken and the lab record; the external examiner's viva typically carries a substantial share in the end-semester practical, with the split set by the university.
Who this is for
Students of Electronics and Communication, Electrical, Electrical and Electronics, Instrumentation and allied branches, including polytechnic diploma students, facing the viva voce after a hardware or simulation experiment in the internal or university practical examination.
The panel focuses on
- The circuit or kit in front of you: every component's purpose, pin numbers, ratings and what the CRO trace shows
- The readings in your record: why that value, which reading is suspicious, and the expected versus observed gap
- Instrument handling: CRO, multimeter, function generator, wattmeter ranges and safety on a machines bench
- What-if reasoning: change a resistor, remove a filter, reverse a supply, increase the load
- Theory behind the experiment at the level of a formula you can explain term by term
- Honest handling of a reading that did not match theory
Step 1
Pick your subject
The expert on the panel probes these areas at the level of this post. Optional here; you can choose during setup.
Step 2
Choose how you want to be interviewed
1:1 interview
One interviewer runs every round and adapts the focus as you go. Lower pressure; ideal for a first attempt.
Prof. Raghunath Kulkarni
Subject expert
Panel interview · 2 members
Most realisticEach member leads their own round and hands over to the next. They hear each other, so a weak answer will be revisited.
Prof. Raghunath Kulkarni
Subject expert
Ms. Deepika Venkatesan
Subject expert
What to expect
4 rounds · 10 minutes
A ten-minute oral examination of the kind held at the end of a laboratory course or project: school board practicals, engineering lab and project vivas, pharmacy and nursing practicals, dissertation and thesis defences. One external examiner, sometimes seated with the internal teacher, asks the candidate what they did, why it works, what they observed and what could go wrong, then looks at the record file or project and asks one question that tests whether the work is the candidate's own. The examiner escalates when answers are correct, gives one hint when the candidate is stuck, and never teaches during the viva.
- Round 1
Introduction
· 1:00Settle the candidate and establish exactly which experiment, practical, project or thesis the viva will be about, so that the subject questions can be anchored to work the candidate actually did.
Prof. Raghunath Kulkarni1–2 questionsup to 1 follow-up each - Round 2
Viva on concepts and experiments
· 7:00Test whether the candidate understands the principle behind the experiment or project they did, can describe the procedure and observations accurately, knows the precautions and sources of error, and can reason about a change in conditions. Separate genuine understanding from a memorised record file.
Prof. Raghunath Kulkarni4–6 questionsup to 2 follow-ups each - Round 3
Record file or project
· 1:00Check that the record file, activity or project is the candidate's own work and that they understand it: why they chose it, what the data or result was, what went wrong and what they would improve.
Prof. Raghunath Kulkarni1–1 questionsup to 1 follow-up each - Round 4
Closing
· 1:00End the viva courteously and formally, as an external examiner does, without feedback, marks or any hint about the result.
Prof. Raghunath Kulkarni1–1 questions
Sample questions
Engineering Viva ECE/EE labs interview questions
Questions panels commonly ask in the Engineering Viva ECE/EE labs interview, with what a strong answer covers. Practise them aloud with the AI panel.
- Analog electronics
In your full-wave bridge rectifier, the CRO shows ripple. Why is it there, and what happens if I remove the filter capacitor?
What a strong answer covers
Explains that the rectified output is pulsating DC, the capacitor charges on peaks and discharges into the load between them, and removing it shows the full rectified waveform with large ripple. Avoid saying ripple is caused by a faulty diode.
- Digital electronics
You connected a JK flip-flop as a counter. What happens when J and K are both high, and why do we need edge triggering?
What a strong answer covers
Both high causes toggling on each clock edge, and edge triggering prevents the race-around condition where the output toggles repeatedly during a level-triggered clock pulse. Avoid confusing JK with SR flip-flop behaviour.
- Electrical machines
In the open-circuit and short-circuit tests on a transformer, which losses does each test measure, and why?
What a strong answer covers
The open-circuit test at rated voltage measures core or iron losses because current is small, and the short-circuit test at rated current measures copper losses because voltage is low. Avoid mixing up which side is energised and why.
- Microcontrollers
Your 8051 program to blink an LED is running, but the LED stays on. What could be wrong?
What a strong answer covers
Checks the delay routine, port pin configuration, whether the LED is connected in sink or source mode, clock frequency assumptions, and the code logic. Avoid immediately replacing hardware without checking the program.
- Control systems
From your step-response plot in MATLAB, how do you find the damping ratio, and what would increasing the gain do?
What a strong answer covers
Uses peak overshoot or settling behaviour to estimate damping, and explains that higher gain usually reduces damping and increases overshoot and oscillation in a second-order system. Avoid reading values from the plot without explaining them.
- Machines safety
Why must the field winding of a DC shunt motor never be opened while the motor is running?
What a strong answer covers
Losing field flux causes speed to rise dangerously as the motor tries to generate back EMF, risking damage and injury. Mentions field failure protection. Avoid saying the motor will simply stop.
- Communication
In your amplitude modulation experiment, how did you calculate the modulation index from the CRO trace?
What a strong answer covers
Uses maximum and minimum envelope amplitudes, applies the standard formula, and explains what over-modulation would look like. Avoid giving only the formula without linking it to the observed trace.
- Lab readings
Your measured voltage gain of the common emitter amplifier is lower than theory. Give two reasons.
What a strong answer covers
Gives concrete reasons such as loading by the next stage or the CRO probe, component tolerance, bias point drifting from the design value, a signal frequency outside the midband, or a missing emitter bypass capacitor. Avoid blaming the equipment without reasoning about the circuit.
- Lab safety
Before switching on the machines bench, what safety checks do you perform?
What a strong answer covers
Checks every connection against the circuit diagram, meter ranges and types, starter or rheostat in the correct starting position, body earthing and loose wires, and gets the faculty's approval before switching on. Avoid energising the bench first and checking afterwards.
Reading is not rehearsing. Answer these out loud to an AI Engineering Viva ECE/EE labs panel that follows up like the real one.
Practise these questionsMeet the panel
Your AI interviewers
Distinct personas, voices and questioning styles, briefed on this post.
Prof. Raghunath Kulkarni
ChairSubject expert
Professor and former Head of Department, government engineering college (Pune); external examiner for university lab and project vivas for 20 years
Unhurried, exacting, fair; wants the reasoning, not the recited definition.
Male voice · 4 languages
Ms. Deepika Venkatesan
Subject expert
Principal Engineer at a Bengaluru product company; industry external examiner for final-year project vivas and lab exams at VTU-affiliated and autonomous colleges
Brisk, practical, curious; judges whether it would actually work.
Female voice · 4 languages
Languages
Answer in the language you think in
The panel asks in your chosen language. Switch mid-answer if you like.
- English
- Hinglish (Hindi + English)Hinglish
How scoring works
A report you can act on
Every round is scored on the rubric
Each interviewer scores only the criteria their round covers. Weights add up to your overall score out of 100.
Only what you actually said counts
Feedback quotes your own answers. Rounds you skip show as “Not assessed” rather than a zero.
Communication is always measured
Fluency, clarity, confidence and structure are tracked across the whole interview, in any language.
Pass mark, then a plan
You see the pass mark for this interview, your gaps, and the courses that close them fastest.
Scored on
- Conceptual understanding40%
States the principle, law or formula behind the experiment or project correctly and in their own words; explains why the method works rather than only what the steps are; handles a why or what-if question with reasoning; does not confuse related concepts or recite a definition that does not answer the question.
- Experimental procedure & observation30%
Describes the actual procedure, apparatus or tools, readings or data and how they were processed; knows the units, the expected result and the order of magnitude they obtained; names sources of error and the precautions that address them; for a project, knows the data, method and limitations of their own work.
- Clarity of explanation20%
Answers the question actually asked in short, ordered sentences; uses correct technical terms and units; can explain the same idea more simply when asked; does not ramble or bury the answer in unrelated recall.
- Confidence & honesty10%
Speaks steadily, holds a correct answer when gently challenged, corrects themselves when shown an error, and says I am not sure rather than guessing; recovers after a hint instead of freezing.
Pass mark 50 / 100 · Practical / project viva voce with an external examiner
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