ONGC AEE Syllabus & Exam Pattern 2026 – Complete Discipline-Wise Guide
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| Short Notice Out — Detailed Notification & Apply Online from 17 July 2026 |
| visit for latest job notification24.in |
| Particulars |
Details |
| Organization Name |
Oil and Natural Gas Corporation Limited (ONGC) — Maharatna CPSE |
| Recruitment Name |
Recruitment of Geologists, Geophysicists and Engineers (AEE) at E1 Level Through CBT |
| Short Notice Released |
10 July 2026 |
| Detailed Notification & Application Opens |
17 July 2026 |
| Level |
E1 (Executive Level 1) |
| Selection Mode |
Computer Based Test (CBT) + Personal Interview |
| Application Fee |
General/EWS/OBC: ₹1,000/- | SC/ST/PwBD: Nil |
| Official Website |
ongcindia.com |
CBT Exam Pattern 2026 (Established ONGC Structure)
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| Particular |
Details |
| Total Questions |
85 Objective-Type Questions |
| Exam Duration |
120 Minutes (2 Hours) |
| Negative Marking |
No Negative Marking |
| Sections |
General Awareness, Concerned Subject (Technical), English Language, Aptitude Test |
| Note: The “Concerned Subject” (technical) section is the highest-weightage portion, based directly on your discipline’s official ONGC syllabus (detailed below) — largely GATE-level content.
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Paper-Wise Post Mapping (Official)
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| Subject Paper |
Applicable Post |
| Mechanical Engineering |
AEE (Drilling)-Mechanical, AEE (Production)-Mechanical, AEE (Mechanical) |
| Petroleum Engineering |
AEE (Drilling)-Petroleum, AEE (Production)-Petroleum |
| Chemical Engineering |
AEE (Production)-Chemical |
| Electrical Engineering |
AEE (Electrical) |
| Geology |
Geologist |
| Geophysics |
Geophysicist (Surface), Geophysicist (Wells) |
| Physics |
Applicable Physics-Based Posts (as per notification) |
| Important: Candidates must appear only for the paper corresponding to their applied post — always cross-check against the detailed advertisement before applying.
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Complete Syllabus — Mechanical Engineering
Engineering Mathematics
- Linear Algebra: Matrix algebra, systems of linear equations, eigen values and eigen vectors
- Calculus: Functions of single variable, limits, continuity, mean value theorems, definite/improper integrals, double/triple integrals, partial derivatives, Taylor series, maxima-minima, Fourier series, gradient/divergence/curl, Gauss/Stokes/Green’s theorems
- Differential Equations: First/higher order linear equations, Euler-Cauchy equation, Laplace transforms, heat/wave/Laplace equation solutions
- Complex Variables: Analytic functions, Cauchy-Riemann equations, Cauchy’s integral theorem, Taylor/Laurent series
- Probability and Statistics: Sampling theorems, mean/median/mode/SD, binomial/Poisson/normal distributions
- Numerical Methods: Numerical solutions of algebraic equations, trapezoidal/Simpson’s rules
Applied Mechanics and Design
- Engineering Mechanics: Free-body diagrams, friction, trusses, kinematics/dynamics of rigid bodies, Lagrange’s equation
- Mechanics of Materials: Stress-strain, Mohr’s circle, thin cylinders, SFD/BMD, torsion, Euler’s column theory, thermal stresses
- Theory of Machines: Mechanism kinematics, cams, gears, flywheels, governors, balancing, gyroscope
- Vibrations: Free/forced vibration, damping, resonance, critical speeds
- Machine Design: Static/dynamic loading, failure theories, fatigue, S-N diagram, joints, shafts, bearings, springs
Fluid Mechanics and Thermal Sciences
- Fluid Mechanics: Fluid properties, statics, control-volume analysis, Bernoulli’s equation, viscous flow, boundary layer, pipe flow
- Heat Transfer: Conduction, unsteady heat conduction, convection, dimensionless parameters, heat exchangers, LMTD/NTU, radiation, Stefan-Boltzmann law
- Thermodynamics: Zeroth/first/second laws, property charts, availability, irreversibility, thermodynamic relations
Applications
- Power Engineering: Compressors, vapour/gas power cycles, regeneration/reheat
- I.C. Engines: Air-standard Otto, Diesel, dual cycles
- Refrigeration/Air-Conditioning: Vapour/gas cycles, psychrometry
- Turbomachinery: Impulse/reaction principles, Pelton/Francis/Kaplan turbines, steam/gas turbines
Materials, Manufacturing and Industrial Engineering
- Engineering Materials, phase diagrams, heat treatment
- Casting, Forming and Joining Processes; welding, brazing, soldering
- Machining and Machine Tool Operations; NC/CNC programming
- Metrology and Inspection; CMM concepts
- Computer Integrated Manufacturing (CAD/CAM), Additive Manufacturing
- Production Planning and Control; Inventory Control; Operations Research (LPP, PERT/CPM)
Application in Oil & Gas Business
- Operation & maintenance of surface facilities (separators, heater treaters, storage tanks, compressors, pumps)
- Group gathering stations, offshore platforms, artificial lift technology
- Processing/recovery of value-added products (LPG, Naphtha), gas sweetening/dehydration
- Workover rig operations, well stimulation services (hydro-fracturing, nitrogen/acid jobs)
- Project management, oil & gas pipelines, Health Safety & Environment (HSE)
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Complete Syllabus — Petroleum Engineering
Engineering Mathematics: Same core topics as Mechanical (Linear Algebra, Calculus, Differential Equations, Complex Variables, Probability & Statistics, Numerical Methods)
- Petroleum Exploration: Classification of rocks, origin/migration/accumulation of petroleum, exploration methods
- Oil and Gas Well Drilling Technology: Well planning, drilling methods/rigs, drilling fluids, cementing, drill bits, drill string/casing design, directional drilling, horizontal/multilateral wells
- Reservoir Engineering: Petrophysical properties, coring, reservoir fluid properties, phase behaviour, flow through porous media, reservoir drives, reserve estimation
- Petroleum Production Operations: Well completion, production problems, workover fluids, formation damage, stimulation techniques, artificial lift, field processing, multiphase flow, nodal analysis
- Offshore Drilling and Production Practices: Fixed/mobile platforms, station keeping, subsea technology, deep water drilling/production systems
- Petroleum Formation Evaluation: SP/resistivity/radioactive/acoustic logs, CBL/VDL, production logging, NMR logging, log interpretation
- Oil and Gas Well Testing: Diffusivity equation, radius of investigation, drawdown/buildup tests, DST, interference/pulse testing
- Health Safety and Environment: Toxicity/hazards, shutdown systems, gas/fire detection, disaster management, environmental impact, oil spill control
- Enhanced Oil Recovery (EOR): Chemical/miscible/thermal flooding, microbial EOR
- Latest Trends: Coal bed methane, shale gas, gas hydrate, heavy oil
- Application in Oil & Gas Business: Same as Mechanical (surface facilities, gathering stations, product recovery, workover operations, HSE)
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Complete Syllabus — Chemical Engineering
Engineering Mathematics: Same core structure as above disciplines
- Process Calculations and Thermodynamics: Mass/energy balances, Gibb’s phase rule, first/second laws, equation of state, phase equilibria, chemical reaction equilibrium
- Fluid Mechanics and Mechanical Operations: Fluid statics, Bernoulli equation, friction factors, pumps/compressors, boundary layer theory, particle size/settling, filtration, agitation
- Heat Transfer: Conduction/convection/radiation, heat exchangers, evaporators design
- Mass Transfer: Fick’s laws, mass transfer coefficients, distillation, absorption, extraction, drying, membrane separations
- Chemical Reaction Engineering: Reaction rate theories, ideal/non-ideal reactors, enzyme kinetics, catalytic reactions, catalyst deactivation
- Instrumentation and Process Control: Sensors/transducers, P&ID, controller modes (P/PI/PID), closed loop stability
- Plant Design and Economics: Cost estimation, depreciation, rate of return, process optimization
- Chemical Technology: Inorganic chemical industries, fertilizers, petroleum refining/petrochemicals, polymerization industries
- Application in Oil & Gas Business: Same as other disciplines (surface facilities, processing, workover, HSE)
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Complete Syllabus — Electrical Engineering
Engineering Mathematics: Same core structure (Linear Algebra, Calculus, Differential Equations, Complex Variables, Probability & Statistics)
- Electric Circuits: Network elements, KCL/KVL, Thevenin’s/Norton’s/Superposition theorems, transient response, resonance, three-phase circuits
- Electromagnetic Fields: Coulomb’s Law, Gauss’s Law, capacitance, Biot-Savart’s law, Ampere’s law, Faraday’s law, inductance
- Signals and Systems: Continuous/discrete signals, LTI systems, Fourier series, sampling theorem, Laplace/Z transforms
- Electrical Machines: Transformers, DC machines, induction machines, synchronous machines, losses/efficiency
- Power Systems: Power generation, transmission line models, economic load dispatch, load flow methods, fault analysis, protection principles
- Control Systems: Transfer functions, block diagrams, stability analysis (Routh-Hurwitz, Nyquist), Bode plots, PID controllers, state space
- Electrical and Electronic Measurements: Bridges, potentiometers, instrument transformers, oscilloscopes
- Analog and Digital Electronics: Diode circuits, amplifiers, op-amps, filters, A/D-D/A converters
- Power Electronics: Thyristor/MOSFET/IGBT, DC-DC converters, rectifiers, inverters, PWM
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Complete Syllabus — Geology
Section 1 (Foundation Topics)
- Earth and planetary system, plate tectonics, continental/oceanic crust, seismology, geomagnetism, isostasy
- Weathering, soil formation, landforms; basic structural geology (folds, faults)
- Crystallography, mineralogy, petrology of igneous/sedimentary/metamorphic rocks
- Geological time scale, stratigraphic divisions of India, mineral/coal/petroleum resources
- Remote sensing basics, engineering properties of rocks/soils, hydrogeology elements
- Gravity, magnetic, electrical, seismic prospecting methods; introductory well logging
Section 2 (Advanced Topics)
- Geomorphology, tectonic geomorphology
- Structural Geology: Rock deformation, planar/linear structures, stereographic projection, geological map interpretation
- Crystallography and Mineralogy: Crystal symmetry, optical properties of rock-forming minerals
- Geochemistry: Elemental distribution, isotopic evolution, water-rock interaction
- Igneous Petrology: Magmatic differentiation, phase diagrams, mantle plumes
- Sedimentology: Facies, environments, basin analysis, Indian sedimentary basins
- Metamorphic Petrology: Facies, thermobarometry, P-T-t paths
- Paleobiology: Fossilization, taxonomy, invertebrate/vertebrate paleontology, paleobotany
- Stratigraphy: Correlation principles, sequence stratigraphy, Indian stratigraphy
- Resource Geology: Ore-mineralogy, coal/petroleum geology, mining methods, mineral economics
- Global Tectonics: Plate motions, supercontinent cycles
- Applied Geology: Rock/soil properties, failure criteria, RMR/Q systems, slope stability
- Natural hazards, hydrogeology, Remote Sensing/GIS basics
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Complete Syllabus — Geophysics
Section 1: Same foundation topics as Geology (earth system, plate tectonics, mineralogy, petrology, stratigraphy, prospecting methods)
Section 2 (Advanced Geophysics)
- Solid-Earth Geophysics: Earth’s motions, gravity field, geomagnetic field, geothermics
- Geodesy: Gravitational field, geoid, ellipsoid, GPS/DGPS, surveying
- Earthquake Seismology: Elasticity theory, body/surface waves, ray theory, seismotectonics, seismic hazards
- Potential and Time Varying Fields: Laplace/Maxwell/Helmholtz equations, Green’s theorem
- Gravity Methods: Gravimeters, land/airborne/marine surveys, Bouguer/isostatic anomalies, data interpretation
- Magnetic Methods: Earth’s magnetic field, magnetometers, IGRF, anomaly interpretation
- Electrical Methods: DC resistivity, IP methods, ERT, SP method applications
- Electromagnetic Methods: EM induction, skin depth, ground/airborne EM, GPR, hydrocarbon exploration applications
- Seismic Methods: Reflection/refraction/CDP surveys, 2D/3D/4D acquisition, deconvolution, migration, AVO, seismic stratigraphy
- Reservoir Geophysics: Rock physics, petrophysics, survey design
- Geophysical Signal Processing: Sampling theorem, Fourier/Hilbert transforms, deconvolution, digital filters
- Geophysical Well Logging: SP, resistivity, gamma ray, neutron, density, sonic, NMR logging, formation evaluation
- Radioactive Methods: Half-life, decay constant, GM counter, scintillation detectors
- Geophysical Inversion: Forward/inverse problems, Tikhonov regularization, SVD, machine learning applications
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Complete Syllabus — Physics
- Mathematical Physics: Vector calculus, linear vector spaces, matrices, complex analysis, Laplace/Fourier transforms, tensors
- Classical Mechanics: Lagrangian/Hamiltonian formulation, central force motion, rigid body dynamics, special relativity
- Electromagnetic Theory: Electrostatics/magnetostatics, Maxwell’s equations, EM wave propagation, Poynting theorem
- Quantum Mechanics: Postulates, Schrodinger equation, potentials, angular momentum, perturbation theory, scattering theory
- Thermodynamics and Statistical Physics: Laws of thermodynamics, ensembles, partition function, Fermi/Bose statistics, phase transitions
- Atomic and Molecular Physics: Atomic spectra, LS/jj coupling, Zeeman/Stark effects, molecular spectra, lasers
- Solid State Physics: Crystallography, band theory, semiconductors, superconductivity (Type I/II, BCS theory)
- Electronics: Semiconductor devices, PN diodes, BJT/FET, digital logic circuits, A/D-D/A conversion
- Nuclear and Particle Physics: Nuclear models, decay processes, particle accelerators, elementary particles, radioactivity
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Complete Selection Process
- Stage 1: Computer Based Test (CBT) — 85 Objective Questions, 120 Minutes, No Negative Marking
- Stage 2: Personal Interview — For Candidates Shortlisted Based on CBT Cut-Off
- Final Selection: Based on Combined Marks of CBT + Interview
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Preparation Strategy for ONGC AEE 2026
- Prioritize your Concerned Subject paper — since it’s GATE-level and carries the highest weightage, treat your GATE preparation material (standard textbooks, previous GATE papers) as your primary resource
- Don’t skip the “Application in Oil & Gas Business” section (for Engineering disciplines) — this ONGC-specific practical knowledge area is often under-prepared by candidates who focus purely on GATE-style theory
- Since there’s no negative marking, attempt all 85 questions — leaving questions blank has no benefit
- For Geology/Geophysics candidates, Section 2 (advanced/specialized topics) typically carries more weightage than Section 1 (foundational) — allocate study time accordingly
- Practice General Awareness and Aptitude sections regularly, as these are common across all disciplines and can be quick scoring opportunities
- Revise using standard GATE reference books for your discipline, supplemented with ONGC-specific oil & gas industry knowledge from company reports and industry basics
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