Last checked against official sources: 10 October 2026.
For engineering graduates, most public sector undertaking (PSU) interviews come at the end of a GATE-based process: a PSU shortlists candidates on their GATE score, then calls them for a group discussion, a personal interview or both, before document verification and a medical examination. The details — which GATE year counts, the stages, the weightage and the qualifying marks — are set separately in each PSU's advertisement. This guide shows you how to read those notices, how weightage changes what you should prepare, and how to get ready for the interview itself.
An earlier version of this article quoted in-hand salaries, panel compositions and "insider" claims we could not verify. Those have been removed.
How GATE fits in
The official GATE 2026 website, run by IIT Guwahati as organising institute, lists the examinations on 7, 8, 14 and 15 February 2026 and the announcement of results on 19 March 2026. It states that a GATE score remains valid for three years from the date results are announced. Its notification banner names PSUs that said they would use GATE 2026 results for recruitment, including EIL, NHAI, GAIL, NIC, OPTCL, NHIDCL and NPCIL, each for particular papers. The site also carries a clear warning: qualifying in GATE does not assure a PSU job.
Not every 2026 drive used GATE 2026. NHPC's 13 August 2026 notice of provisionally selected Trainee Engineers (Mechanical) under Advertisement No. NH/Rectt/02/2026 shows selection based on GATE-2024/GATE-2025 score, group discussion and personal interview. So always check which GATE year and paper a notice accepts.
Keep preparing
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Before preparing for the interview, pull these points out of the advertisement and keep them on one page:
| Item | Why it matters |
|---|---|
| GATE paper and year accepted | Your score may be valid for GATE purposes but not accepted by this drive |
| Eligibility: degree, minimum marks, age and the "as on" date | Interview performance can't fix an eligibility failure |
| Shortlisting ratio or method | Tells you how competitive the call-up is |
| Stages: GD, group task, psychometric test, interview | Decides what to practise |
| Weightage of GATE, GD and interview | Shows how much the interview can move your rank |
| Minimum qualifying marks in GD/interview | You may need a floor score even with a high GATE score |
| Documents and certificate formats | Caste, EWS and PwBD certificates often have prescribed formats and dates |
| Medical standards | Fitness is usually a condition of appointment |
| Service agreement or bond | Know the terms before you accept |
Worked example: how weightage changes your preparation
Weightages differ by PSU, so this example uses a hypothetical split that you should replace with the figures in your notice: GATE score normalised to 100 carries 80%, and the interview carries 20%.
| Candidate | GATE (out of 100) | Interview (out of 100) | Final score |
|---|---|---|---|
| A | 72 | 60 | 0.8 × 72 + 0.2 × 60 = 57.6 + 12.0 = 69.6 |
| B | 76 | 45 | 0.8 × 76 + 0.2 × 45 = 60.8 + 9.0 = 69.8 |
B leads by 0.2 despite a much weaker interview. Each interview point is worth 0.2 final marks and each GATE point 0.8, so A needs four interview points to make up one GATE point. If A scored 62 instead of 60 in the interview, A's total would be 57.6 + 12.4 = 70.0 and A would rank above B. When candidates bunch together on GATE scores, a few interview marks decide the order.
What the interview usually tests
Panels vary, but you should be ready for four areas.
1. Core technical subjects
Expect questions from your GATE paper's core subjects, often with a practical twist. Model answers to practise:
- Mechanical: "Why is the efficiency of an actual Rankine cycle lower than that of a Carnot cycle between the same temperature limits?" Heat in the boiler is added over a range of temperatures, including heating of the feedwater, so the mean temperature of heat addition is lower than the maximum; real cycles also have irreversibilities such as friction and pressure losses.
- Electrical: "Why is power transmitted at high voltage?" For the same power, a higher voltage means a lower current, and resistive losses vary with the square of the current, so losses fall sharply.
- Civil: "Why does concrete need curing?" Cement hydration needs moisture; curing maintains it, which supports strength development and reduces shrinkage cracking.
- Computer science and IT: "Explain ACID properties." Atomicity, consistency, isolation and durability — and give an example of what goes wrong without isolation, such as two transfers reading the same balance.
- Electronics and instrumentation: "What does a PLC do in a plant?" It reads sensor inputs, runs control logic and drives outputs such as motors and valves, in an environment built for industrial reliability.
2. Your project and training
Be ready to explain your final-year project and any internship in detail: the problem, your contribution, the method and what you would improve. Panels often use it as a way into deeper technical questions.
3. The organisation and its sector
Read the PSU's latest annual report and its website's business pages. Know its main business lines, a few recent projects and the ministry it reports to. Link one of them to your branch: "Your hydro projects use large rotating machines, which connects to my work on vibration analysis."
4. Suitability for the job
Expect practical questions: willingness to work at remote sites or plants, in shifts, and anywhere in India; why the public sector; and how you handle pressure. Answer honestly and consistently with what you declared in your application.
If there is a group discussion
Some notices include a GD or group task before the interview. Prepare structured, evidence-based points on energy, infrastructure and technology themes relevant to the PSU's sector. Our group discussion guide covers formats and a practice plan.
Documents and medical fitness
Many candidates lose time — or the opportunity — at document verification. Keep your GATE scorecard, mark sheets, degree certificate and category certificates in the format and validity window the notice prescribes. Read the medical standards attached to the advertisement; our guide to government job medical standards explains how to find the rules that apply to you.
A four-week interview plan
| Week | Focus |
|---|---|
| 1 | Make the one-page notice summary; list 40 core-subject questions from your GATE syllabus |
| 2 | Answer 10 core questions aloud daily; prepare a five-minute project explanation |
| 3 | Read the PSU's annual report and sector news; prepare "why this PSU" and "why public sector" |
| 4 | Two mock interviews with a panel of friends or seniors; organise documents in the notice's order |
Final checklist
- Confirm the GATE year and paper the notice accepts.
- Note the weightage and any minimum interview marks.
- Revise core subjects with practical examples.
- Prepare your project, internship and organisation research.
- Arrange documents exactly as the notice prescribes.
- Check the medical standards early.