Interview experience
HPCL interview experiences covering the Computer Based Test, Group Task, Personal Interview and medical. Round-wise notes, reported questions, and what clears each stage.
HPCL Interview Questions and Answers (2026)
Hindustan Petroleum Corporation Limited is a Maharatna oil refining and marketing public sector company with refineries at Mumbai and Visakhapatnam, a national product pipeline network, LPG bottling plants and retail outlets. It recruits fresh engineers as Officers through its own computer-based test, group task and interview.
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Overview
HPCL (Hindustan Petroleum), a Maharatna oil refining and marketing PSU, hires fresh engineers as Officers in the Mechanical, Electrical, Civil and Chemical Engineer posts through its own Computer Based Test, followed by a Group Task and a Personal Interview. It does not use GATE scores in its recent advertisements, which is the main difference from what many candidates expect after preparing for BPCL or IOCL.
HR interview questions
HPCL HR interview questions with sample answers - motivation, postings and shifts, the service bond, and plant-safety situations.
HPCL interview process at a glance
| Round | Duration | What it tests |
|---|---|---|
| Computer Based Test | 150 min, 170 MCQs | 85 general aptitude (English, quant, reasoning, data interpretation) + 85 technical questions from your degree |
| Document upload and scrutiny | - | Eligibility proofs for candidates in the CBT merit list |
| Group Task | Not published | Teamwork, communication, contribution without dominating |
| Personal Interview | 30+ min reported | Branch fundamentals with a plant angle, project, work history, HR fit |
| Pre-Employment Medical Exam | - | Fitness as per HPCL’s published medical standards |
HPCL online test (CBT): quick answers
These answers come from HPCL’s own advertisements and selection-methodology notices for 2021, June 2025 (HPCL/OPEN/HR/1/2025-26) and February 2026 (HPCL/OPEN/HR/3/2025-26), plus public candidate reports. HPCL changes details between cycles, so the advertisement for your cycle is the final word.
| Question | Answer |
|---|---|
| Is selection through GATE? | Not in the recent cycles. The 2021, 2025 and 2026 engineer advertisements all use HPCL’s own CBT and do not mention GATE. HPCL did shortlist on GATE in earlier years (cutoff tables are public for 2016 and 2018), and some coaching sites still describe a GATE route, but we found no current HPCL advertisement that confirms one. |
| How many questions and how long? | 170 multiple-choice questions in 150 minutes: 85 general aptitude and 85 technical/professional knowledge. PwBD candidates get 50 extra minutes. |
| Is there negative marking? | Yes. HPCL’s 2025-26 methodology deducts 0.25 marks for every wrong MCQ answer. |
| What are the qualifying marks? | Overall CBT: 60% for UR/EWS and 54% for SC/ST/OBC(NC)/PwBD. Technical section: 50% for all categories. Clearing these only puts you on the merit list; the number called for Group Task and interview depends on a predetermined ratio to vacancies. |
| What is the cutoff? | HPCL does not publish a cutoff in advance. Its February 2026 advertisement says candidates can see their own marks and the cutoffs in the candidate login after the exam. |
| How is the final merit list weighted? | The 2021 advertisement published CBT 85%, Group Task 5% and Personal Interview 10%, with 40% (UR/EWS) or 33.33% (reserved) minimum in the GT and PI. The 2025 and 2026 advertisements say the merit list combines CBT, Group Task and interview scores but do not publish the weights. |
| Which disciplines? | The 2025 and 2026 fresher Engineer posts are Mechanical, Electrical, Civil and Chemical. The 2021 cycle had Mechanical, Civil, Electrical and Instrumentation instead, with no Chemical post. Instrumentation degrees still appear in HPCL’s eligible-degree tables, but there was no separate fresher Instrumentation Engineer post in 2025 or 2026. |
| Is there coding? | No. The technical section is your branch syllabus, which HPCL publishes on its careers page before each CBT. |
| Is HRRL (Barmer) recruitment the same? | No. HPCL Rajasthan Refinery Limited is a separate company (HPCL 74%, Government of Rajasthan 26%) and runs its own advertisements. |
HPCL interview questions by branch
Public first-hand reports for HPCL are thin. The Electrical row is from a detailed 2021 GeeksforGeeks report; the other rows are the plant topics HPCL’s postings point to, not verbatim reported questions.
| Branch | Reported questions and topics |
|---|---|
| Electrical | How is a substation energised, and how many incoming feeder sources does it have? What does a bus coupler do, and what if one source trips while you are charging the line-up? Earthing vs neutral, and how neutral and body earth pits differ. Lightning arresters. |
| Mechanical | No detailed recent report found. Expect centrifugal pumps, heat exchangers, compressors, valves, storage tanks and pipeline surge. |
| Chemical | No detailed recent report found. Expect desalting, crude distillation, hydrotreating for BS-VI and lube base oil manufacture, given HPCL’s refineries. |
| Civil | No detailed recent report found. Expect tank foundations, RCC cover and exposure classes, and site work for retail outlets and terminals. |
Asked across every branch: introduce yourself, your final-year project or previous job in detail (including why you left), how you manage stress with a recent real example, and whether you accept shift work, any posting and the three-year bond.
Computer Based Test
The CBT has two halves of equal size: general aptitude (English, quantitative aptitude, logical reasoning and data interpretation) and technical or professional knowledge from your qualifying degree. Because the technical half has its own 50% cutoff on top of the overall 60% (UR/EWS), a strong aptitude score cannot rescue a weak technical score. With 0.25 negative marking, guessing on 170 questions in 150 minutes costs more than it looks.
Common questions
- Branch MCQs from HPCL’s published syllabus (for example thermodynamics, fluid mechanics, SOM and machine design for Mechanical; machines, power systems and protection for Electrical)
- Quantitative aptitude and data interpretation sets
- Logical reasoning puzzles and series
- English: reading comprehension, grammar and vocabulary
Group Task
HPCL uses a Group Task, not only a classic group discussion. The one detailed public report (2021) describes groups of six or seven, with roughly four of twenty candidates going on to the interview that day. The written advice was to work as a team, let others speak, and not stay silent. HPCL has not published the task format.
Common questions
- Group problem-solving or planning exercise that the group must complete together
- Topics on energy, fuels, safety or current affairs where a discussion element is included
- How you handle a quieter or dominant teammate during the task
Personal Interview
The interview goes deep on your branch as it applies to HPCL’s assets: refineries at Mumbai and Visakhapatnam, product pipelines, terminals and depots, LPG bottling plants and retail outlets. HPCL’s advertisement says engineers can be placed in operations, sales, engineering and projects, retail outlet upgradation, operations and distribution, or refinery roles, so panels often test whether you can handle field work as well as plant work.
Common questions
- Core-discipline questions tied to plant equipment (pumps, exchangers, tanks for Mechanical/Chemical; substations, earthing, motors for Electrical; foundations, RCC and tank pads for Civil)
- Your final-year project or internship, in detail
- Any previous job: why you left, and what you actually did there
- Are you willing to work in shifts and be posted anywhere, including subsidiaries and joint ventures?
- Why HPCL, and why an oil PSU over a private core company?
Sample answers for the HR-side questions are on the HPCL HR interview questions page.
Why the service bond and postings come up
HPCL’s advertisement says officers can be posted to any SBU, division or department anywhere in the country, may work in shifts, and may be assigned to subsidiaries, joint ventures or a Government of India department. It also requires a three-year service bond with surety and holds back Rs 8,000 a month for the first year. Panels know some candidates use a PSU offer as a stopgap, so they test whether you have read these terms and whether your plans fit them. An honest answer about constraints is better than a vague “anywhere” you cannot back up.
HPCL facts worth knowing before the interview
These are from HPCL’s own recruitment advertisements unless noted.
| Fact | Detail |
|---|---|
| Status | Maharatna CPSE, established 15 July 1974, headquartered in Mumbai |
| Refineries | Mumbai (9.5 MMTPA) and Visakhapatnam (15.0 MMTPA); lube refinery at Mumbai (428 TMTPA), which HPCL calls the largest in India |
| Joint ventures | 48.99% of HMEL (11.3 MMTPA Bathinda refinery) and 16.96% of MRPL (15 MMTPA Mangalore refinery) |
| Rajasthan refinery | HRRL, a 9 MMTPA refinery-cum-petrochemical complex at Pachpadra, Balotra district (Barmer region), 74% HPCL and 26% Government of Rajasthan. Commissioning dates slipped repeatedly through 2026 according to press reports, so check the latest status before quoting it. |
| Pipelines | About 5,134 km of product pipelines, which HPCL describes as India’s second-largest network |
| R&D | HP Green R&D Centre, Bengaluru |
| Climate target | Net zero for Scope 1 and 2 emissions by 2040 |
HPCL vs HRRL, HMEL and MRPL
HPCL is the parent company and runs its own officer recruitment, which is what this page covers. HPCL Rajasthan Refinery Limited (HRRL, Barmer region) is a separate company, 74% owned by HPCL and 26% by the Government of Rajasthan, and it publishes its own advertisements. HMEL (Bathinda) and MRPL (Mangalore) are joint ventures or associates in which HPCL holds a stake (48.99% and 16.96%), and they hire through their own processes too.
An HPCL officer can still be assigned to a subsidiary or joint venture after joining, as the advertisement states, but applying to HPCL does not put you in the running for HRRL, HMEL or MRPL posts. Track each company’s careers page separately.
Common technical interview questions and answers
Q: How does a desalter work and why does it sit before the crude furnace?
Crude arrives carrying brine, salts such as sodium, calcium and magnesium chlorides, and sediment. In the desalter the crude is mixed with wash water, typically a few percent by volume, through a mixing valve, then held in a large horizontal vessel where an electrostatic field coalesces the water droplets so they settle out, taking the dissolved salt with them. It sits upstream of the furnace and crude column because those salts hydrolyse at high temperature to form hydrochloric acid, which corrodes the column overhead system, and because salt and solids foul preheat exchangers and furnace tubes. Desalter performance is therefore a corrosion-control and reliability question as much as a process one.
Q: Why do pipeline pumping stations care about surge pressure?
When flow in a long liquid pipeline is stopped or changed suddenly - a valve slamming shut or a pump tripping - the kinetic energy of the moving column converts into a pressure wave that travels along the line at the speed of sound in the liquid. The Joukowsky relation gives the pressure rise as density times wave speed times the change in velocity, which can be far above normal operating pressure. Pumping stations protect against it with controlled valve closure times, surge relief valves that divert flow to a relief tank, and pressure trips that sequence pumps rather than stopping them all at once.
Q: What is the difference between a fixed-roof and a floating-roof storage tank?
A fixed-roof tank has a permanent cone or dome roof with a vapour space above the liquid, which suits low-volatility products such as diesel, fuel oil or lube base stocks. Each time it fills or warms up, vapour is pushed out through breather vents, so for volatile products such as crude, naphtha and petrol the losses and fire risk would be high. A floating-roof tank has a roof that rests on the liquid surface and rises and falls with it, sealed to the shell by primary and secondary rim seals, which almost eliminates the vapour space. That is why refinery and terminal tank farms store light products in floating-roof tanks and heavier ones under fixed roofs.
Q: How is lube base oil made from crude, and why does HPCL’s Mumbai lube refinery matter?
Lube base oils come from vacuum distillate and deasphalted vacuum residue. The conventional route removes asphaltenes with propane deasphalting, takes out aromatics with solvent extraction such as furfural or NMP to raise the viscosity index, and removes waxy paraffins by solvent dewaxing so the oil stays fluid in cold weather, followed by hydrofinishing for colour and stability. Newer plants replace the solvent steps with hydrocracking and catalytic dewaxing to make higher-grade base oils. HPCL describes its Mumbai lube refinery as the largest in India, at 428 thousand tonnes a year, which is why lube questions can come up for Chemical candidates.
Q: What does a bus coupler do in a substation?
A bus coupler is a circuit breaker with isolators that connects two busbar sections in a double-bus or sectionalised-bus arrangement. It lets operators transfer feeders from one bus to the other without interrupting supply, take one bus out for maintenance, and split the load between incoming sources. If one incoming source trips, the coupler can be closed - manually or through an automatic transfer scheme, after checking synchronism where both sides could be live - so the healthy source picks up the dead section. Interviewers ask this because refinery and terminal power systems are run with redundant incomers precisely so a single trip does not shut the plant down.
Q: What is the difference between earthing and the neutral?
The neutral is a current-carrying conductor: in a three-phase four-wire system it is the return path for unbalanced load current and is connected to the star point of the transformer. Earthing is a protective connection of equipment bodies and structures to the general mass of earth so that, in a fault, the exposed metal stays near earth potential and enough fault current flows to operate protection. The neutral is usually earthed at the source, but it is not a substitute for equipment earthing, and the two use separate earth pits. In hazardous refinery areas, earthing and bonding also discharge static electricity during product transfer.
Q: Why does BS-VI fuel need hydrotreating?
BS-VI limits sulphur in petrol and diesel to 10 parts per million. Straight-run and cracked streams carry far more than that as organic sulphur compounds, so refineries pass them over a cobalt-molybdenum or nickel-molybdenum catalyst with hydrogen at high temperature and pressure. The sulphur is converted to hydrogen sulphide, which is removed by amine treating and turned into elemental sulphur in a sulphur recovery unit. The hardest molecules to treat are substituted dibenzothiophenes, which is why ultra-low-sulphur diesel needs higher pressure, more catalyst and more hydrogen than older specifications did.
Q: What safety features does an LPG bottling plant rely on?
LPG is heavier than air, so a leak collects at ground level and in drains rather than dispersing. Bottling plants therefore use gas detectors placed low and set to alarm at a fraction of the lower explosive limit, flameproof electrical equipment in classified areas, and earthing and bonding of tank trucks during decantation to prevent static sparks. Storage is usually in mounded bullets, which protects the vessels from fire impingement that could otherwise cause a boiling liquid expanding vapour explosion. Water sprinkler and deluge systems, remotely operated shut-off valves and a strict permit-to-work system complete the picture. Panels ask this because LPG bottling plants are among the most common first postings in marketing.
Q: What does cover to reinforcement do in an RCC member, and what decides it?
Clear cover is the concrete between the outermost steel and the surface. It protects the reinforcement from corrosion by keeping moisture, chlorides and carbonation away from the steel, gives fire resistance, and ensures enough concrete around the bars for bond. In India IS 456 sets nominal cover by exposure condition, from mild to extreme, with extra requirements for fire rating and minimum values for members such as footings. For Civil candidates at an oil company, the follow-up is usually about aggressive exposure: tank foundations, coastal terminals and areas exposed to hydrocarbons and chemicals, where you would choose the higher exposure class.
Frequently asked questions about HPCL interviews
Does the HPCL CBT have negative marking?
Yes - HPCL’s 2025-26 selection methodology deducts 0.25 marks for every wrong MCQ answer. The paper has 170 questions in 150 minutes, 85 general aptitude and 85 technical.
What is the HPCL CBT cutoff?
HPCL does not publish a cutoff in advance; candidates see their own marks and the cutoffs in the candidate login after the exam. The published minimums are 60% overall for UR/EWS (54% for SC/ST/OBC-NC/PwBD) and 50% in the technical section for everyone.
What is the HPCL interview process for freshers?
HPCL’s fresher Engineer process has 4 stages: a Computer Based Test, a Group Task, a Personal Interview and a pre-employment medical exam, for the Mechanical, Electrical, Civil and Chemical Engineer posts. The official 2025-26 and February 2026 advertisements list the stages as: 1. Computer Based Test - 85 general aptitude and 85 technical MCQs in 150 minutes with 0.25 negative marking. 2. Document upload and scrutiny for candidates in the CBT merit list. 3. Group Task. 4. Personal Interview, with psychometric assessment possible before or after these rounds. 5. Pre-Employment Medical Examination at an HPCL-empanelled hospital. Every stage is an elimination round.
Does HPCL still recruit engineers through GATE?
Not in the recent cycles we checked. HPCL used GATE scores for officer hiring in earlier years (public cutoff tables exist for 2016 and 2018), but its 2021 engineer advertisement and its June 2025 and February 2026 officer advertisements all select through HPCL’s own Computer Based Test, and none of them mention GATE. Some coaching sites still publish “HPCL recruitment through GATE” articles; treat those as unconfirmed unless HPCL’s own advertisement says so.
What questions are asked in HPCL interviews?
The Personal Interview concentrates on your engineering discipline and how it applies to refineries, pipelines, terminals, LPG plants and retail engineering, plus your final-year project, internships and any work history. The one detailed public report we found (an electrical candidate, 2021) describes a 9-10 member panel, interviews longer than 30 minutes, questions on substation charging, bus couplers, earthing versus neutral and lightning arresters, and repeated cross-questioning on HR answers.
How many rounds are there in the HPCL interview?
For the fresher Engineer posts: a Computer Based Test, a Group Task and a Personal Interview, followed by a Pre-Employment Medical Examination. Candidates must clear the minimum qualifying marks at each stage. The final merit list is category-wise and discipline-wise.
What is the salary and bond for an HPCL Engineer?
The fresher Engineer posts are in the Rs 50,000-1,60,000 pay scale, joining at the minimum. HPCL’s advertisement puts the approximate CTC at Rs 17.72 lakh (June 2025) and Rs 18.14 lakh (February 2026), calculated for metro postings and including performance-related pay at its maximum. Selected candidates sign a three-year service bond with surety: Rs 3,00,000 for General and Rs 50,000 for EWS/OBC(NC)/SC/ST/PwBD. Rs 8,000 a month is also held back as a retention amount for the first 12 months and released after three years without interest.
How should I prepare for HPCL interviews?
Prepare for the CBT first, because it is both the shortlist and, in the last cycle that published weights, 85% of the final score. Split time evenly between your branch syllabus and general aptitude, since each is 85 questions and the technical section has its own 50% qualifying mark. For the Group Task and interview, revise core fundamentals with a plant angle, know HPCL’s refineries and pipeline network, and prepare an honest answer on postings and shift work.
How to prepare for HPCL interviews
- Loop map: Computer Based Test; document upload; Group Task; Personal Interview; Pre-Employment Medical Exam. Dates and venues come through the candidate login and email.
- Technical depth: Drill the Q&A section until answers are spoken, not read. Know every resume project cold.
- Experiences: Study round-wise notes on the interview experience page.
- HR: A specific “Why HPCL?” and an honest postings-and-bond answer on the HR page.
Who usually fits and who struggles
Good fit: You can score evenly across aptitude and your branch under negative marking, you can explain pumps, tanks, substations or foundations in terms of a real plant, and you are comfortable with shifts, field postings and a three-year bond.
Harder path: You prepared only for GATE and skipped aptitude; you treat the Group Task as a speaking contest; you want a metro-only posting; you cannot explain a gap or a previous job without getting defensive.
A practical HPCL prep plan
Use this as a default four-week loop once the advertisement is out. HPCL’s CBT date is usually announced in the advertisement itself (the February 2026 one gave a tentative date of 3 May 2026), so count back from it.
- Week 1: Download the syllabus for your post from HPCL’s careers page. Take one timed 170-question mock (85 aptitude + 85 technical) in 150 minutes with −0.25 marking. Note which half dragged you below its cutoff.
- Week 2: Branch revision from the syllabus, plus one 30-minute aptitude set a day. Track your accuracy rate: with negative marking, an attempt only pays off if you are right more than one time in five.
- Week 3: Two more full mocks. Start interview prep: one-page notes on HPCL’s refineries, pipelines and the HRRL project, and a plant-angle answer for each of your top five branch topics.
- Week 4 (after the CBT result, before GT/PI): Two mock interviews with a senior from your branch, one practice group task, and a document check against the advertisement’s list.
10-day crash version: Days 1-4 timed technical sets from the syllabus, days 5-6 aptitude under negative marking, day 7 a full mock, days 8-9 HPCL facts and project walkthrough out loud, day 10 documents and rest.
Compensation notes
HPCL publishes an approximate CTC in each advertisement: Rs 17.72 lakh for the Rs 50,000-1,60,000 scale in June 2025 and Rs 18.14 lakh in February 2026. That figure assumes a metro posting and counts performance-related pay at its maximum, so take-home pay in the first year will be noticeably lower, especially with the Rs 8,000 monthly retention deduction. Junior Executive (diploma) posts are on the Rs 30,000-1,20,000 scale, with an approximate CTC of Rs 10.63-10.88 lakh across the same two advertisements.
Sources
Interview process details and sample questions on this site are editorially organized from official notices, public candidate reports and hiring write-ups, with round structure, prep notes, and company-specific framing added by our team. For round-by-round stories, see the HPCL interview experience page. Pay, bond, eligibility, CBT pattern and qualifying marks come from HPCL’s recruitment advertisements HPCL/OPEN/HR/1/2025-26 (June 2025) and HPCL/OPEN/HR/3/2025-26 (February 2026), its 2025-26 selection-methodology notice and its 2021 engineer advertisement; historical GATE cutoffs from Careers360; HRRL ownership and commissioning from 2026 press reports in The Week and Argus. The branch-wise table draws on the 2021 HPCL GT and interview report on GeeksforGeeks. placementpapers.app does not have an HPCL page yet, so the links below go to its IOCL pages, which cover a similar oil-PSU written test.