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Chemical Engineering · 1,005 questions

Chemical Engineering Interview Questions for freshers and experienced engineers

Chemical is a small branch with unusually high-paying recruiters: Reliance's GET programme, refiners and gas PSUs via GATE, specialty chemicals, pharma and EPC design houses. Fresher interviews ask you to draw the PFD of your project and reason about unit operations; PSU interviews after GATE test the same fundamentals in depth; experienced interviews test simulation, equipment design, HAZOP and plant operations.

Start practising free Free readiness check
GATE CH 2025 registrations
18,009
Reliance GET fresher CTC
Rs 7.5-9 LPA
Placement rate
59%

Three sections, one ladder

Core covers the campus and GATE/PSU technical round. Design covers the tools, codes and standards experienced hires are tested on. Industry covers plant, site and production practice.

Chemical Core

Transport, heat & mass transfer, CRE, thermo

Fluid mechanics, heat transfer, mass transfer, reaction engineering, thermodynamics, process control, mechanical operations, chemical technology, material & energy balance, plant economics, instrumentation and corrosion basics — the campus technical round and GATE/PSU interview spine.

Process Design

Aspen, P&ID, equipment, HAZOP, piping, codes

Aspen/HYSYS simulation, P&ID/PFD documentation, exchanger & column design (TEMA), pressure vessels (ASME VIII, API 610/650), HAZOP/LOPA/SIL (IEC 61511), relief (API 520/521), control design, piping (ASME B31.3), pinch analysis, materials selection, FEED/EPC workflow, effluent design and reactor scale-up — the process-engineer and experienced-hire layer.

Plant Operations

Refinery, petrochem, PSM, HSE, reliability

Plant operations, refinery & petrochemical units, fertiliser/chlor-alkali, pharma cGMP, process safety management (OISD), HSE & regulatory (Factories Act, MSIHC, CPCB), QA/QC lab, RBI & turnarounds, utilities & offsites, production cost, APC/digitalisation and commissioning — what production, safety and reliability interviews ask.

Who hires chemical engineers

  • Reliance Industries (largest GET hirer), Nayara, Tata Chemicals, Grasim
  • Deepak Nitrite, Aarti, UPL, Pidilite, Asian Paints
  • Pharma: Dr. Reddy's, Sun, Cipla; FMCG: HUL, P&G, ITC
  • EPC: Toyo, Technip, L&T Hydrocarbon, EIL

Government route

  • GATE CH -> IOCL (85% GATE + 15% GD/GT and interview), ONGC, GAIL, HPCL, BPCL, EIL
  • Fertiliser and petrochemical PSUs
  • ISRO and DRDO propulsion and materials labs
GATE CH pattern setAll government jobs →

How the interview runs

  1. 1Online test: cognitive + technical (Reliance GET), or GATE score shortlisting (PSUs)
  2. 2Technical panel: draw the PFD/P&ID of your project, equipment selection logic, safety basics
  3. 3Group discussion at IOCL; HR on plant postings and shifts
  4. 4Eligibility 60% with no backlogs at Reliance

What experienced engineers get asked

  • Aspen Plus/HYSYS, DWSIM; property packages, column and exchanger design (TEMA), pinch analysis
  • ASME VIII, API 520/521 relief and flare, API 610, ASME B31.3 piping, NACE materials
  • HAZOP, LOPA, SIL per IEC 61511, PSM, OISD standards, MOC and PSSR
  • Operations: DCS, APC, turnarounds, RBI per API 580/581, debottlenecking

Your level, your role

Pick where you are and what you are targeting; placd builds the prep journey and the mock-interview rounds from it.

Levels

  • Fresher · Core / PSU
    IOCL / ONGC / GAIL / BPCL — GATE-style core + technical interview
  • Fresher · Private / Campus
    Reliance / UPL / Tata Chemicals / EPCs — aptitude + core + HR
  • Engineer (2–5 yrs)
    2–5 yrs — simulation, P&ID, HAZOP and plant ops decide
  • Senior (5–10 yrs)
    5–10 yrs — process ownership, safety, reliability, cost
  • Lead / Manager
    Lead / Manager — plant, PSM, projects; fundamentals still screened

Roles

  • Process Engineer
    Aspen, P&ID, equipment design, HAZOP
  • Production / Plant Ops
    Shift ops, DCS, refinery & chemical units
  • Process Safety / HSE
    PSM, HAZOP, OISD, regulatory
  • R&D / Quality
    Reaction engineering, scale-up, QA/QC
  • Core PSU / GATE
    IOCL, ONGC, GAIL, BPCL, HPCL, EIL

Interview questions by topic

Browse any topic free. Answers and explanations are one free account away; the free readiness check gives you a scored taste of the mock interview.

Frequently asked

What is asked in a chemical engineering fresher interview?

Material and energy balances, Reynolds number and pump NPSH, LMTD and exchanger types, McCabe-Thiele and reflux, CSTR versus PFR, VLE and Raoult's law, PID and cascade control, reading a P&ID, and HAZOP basics.

How does the Reliance GET selection work?

Screening on eligibility, an online cognitive and technical test, then a regional personal interview where you draw and defend your project's process flow, followed by a medical.

What do IOCL, ONGC and GAIL ask after GATE?

IOCL weights GATE 85% and GD/GT plus interview 15%. The interview covers mass transfer, heat exchangers, reaction engineering, pumps and compressors, refinery flow and process safety, plus your project.

What do experienced process engineers get asked?

Simulation convergence and property-package choice, exchanger and column sizing, relief-valve and flare load cases per API 520/521, HAZOP leadership and SIL determination, and plant debottlenecking or turnaround experience.

Guide

Chemical Engineering Interview Questions 2026: Reliance GET, IOCL and Process Roles

How Reliance, refiners and gas PSUs interview chemical engineers, 27 questions with answers on mass and heat transfer, CRE, control and HAZOP, and a 4-week plan.

Read the guide

Other departments

MechanicalCivilElectrical / EEEElectronics & Comm.Software & IT