ONGC Graduate Trainee Syllabus 2026, Check Exam Pattern and Subject-Wise Syllabus Here

ONGC has released the syllabus for Graduate Trainee recruitment in 2026. The exam is a Computer Based Test (CBT). ONGC Graduate Trainee exam is for Engineers and Geologists at the E1 level. Knowing the syllabus helps you plan your studies better and score well.

The ONGC Graduate Trainee Syllabus 2026 covers five main subjects. These are Petroleum Engineering, Mechanical Engineering, Chemical Engineering, Instrumentation Engineering, and Geology. Each subject has many important topics. Candidates must study their own subject area carefully before the exam.

ONGC Graduate Trainee Syllabus 2026

ONGC Graduate Trainee Syllabus 2026 covers five academic streams. These are Petroleum, Mechanical, Chemical, and Instrumentation Engineering, along with Geology. Each stream has its own set of topics. Candidates must check the syllabus of their own stream only. The syllabus is very detailed. It has core subjects and also application-based topics on Oil and Gas Business. Candidates should read the official notice first. This helps them apply with full details in hand.

ONGC Graduate Trainee Syllabus: Overview

Here is a quick overview of the ONGC Graduate Trainee 2026 recruitment. This table gives you all the basic details at a glance. Read it carefully before you start your preparation. It will help you understand the key facts about this job exam.

ONGC Graduate Trainee Exam Pattern 2026

Knowing the exam pattern helps you plan your study time very well. ONGC Graduate Trainee exam is a computer based test with multiple choice questions. The paper includes technical subjects, general awareness and aptitude sections together for all candidates.

• The exam will be online CBT type.
• All questions will be Objective Type MCQs.
• Total duration will be 2 hours (120 minutes).
• There will be negative marking of 0.25 marks for wrong answer.

Exam Pattern:

ONGC Graduate Trainee Syllabus 2026 (Subject-Wise)

The syllabus is different for each stream or subject. Each stream has its own set of topics to study. You must study only the topics from your own stream. Below is the full subject-wise syllabus in simple points for easy understanding.

1. Petroleum Engineering Syllabus

A. Engineering Mathematics

• Linear Algebra: Matrix algebra, linear equations, Eigen values and vectors
• Calculus: Single variable functions, Taylor series, integrals, Gradient, Divergence, Curl, Stokes, Gauss and Green’s theorems
• Differential Equations: First and higher order equations, Cauchy’s and Euler’s equations, Laplace transforms, heat and wave equations
• Complex Variables: Complex numbers, polar form, triangle inequality
• Probability and Statistics: Probability, mean, median, mode, standard deviation, Poisson, Normal and Binomial distributions, regression analysis
• Numerical Methods: Solutions of algebraic equations, Simpson’s rule, trapezoidal rule, multi-step method.

B. Core Petroleum Topics

• Petroleum Exploration: Rock types, origin and migration of petroleum, exploration methods
• Oil and Gas Well Drilling Technology: Well planning, drilling methods, drilling rigs, drilling fluids, cementing, drill bits, casing, directional drilling
• Reservoir Engineering: Petrophysical properties, core analysis, reservoir fluids, fluid flow, reserve estimation
• Petroleum Production Operations: Well equipment, completion techniques, workover, artificial lift, field processing, storage, LNG, multiphase flow, nodal analysis
• Offshore Drilling and Production Practices: Offshore platforms, mobile units, mooring, dynamic positioning, deep water technologies
• Petroleum Formation Evaluation: SP logs, resistivity logs, radioactive logs, acoustic logs, NMR logging, CBL/VDL, log interpretation
• Oil and Gas Well Testing: Diffusivity equation, pressure transient tests, drawdown and buildup tests, gas well testing
• Health Safety and Environment (HSE): Health hazards, safety systems, gas and fire detection, HSE policies, oil spill control, waste treatment
• Enhanced Oil Recovery (EOR): Chemical flooding, miscible flooding, thermal recovery, microbial EOR, coal bed methane, shale gas
• Application in Oil and Gas Business: Surface facility operations, gas lift, LPG recovery, gas sweetening, gas dehydration, workover operations, pipeline, project management

2. Mechanical Engineering Syllabus

A. Engineering Mathematics

• Linear Algebra: Matrix algebra, linear equations, Eigen values and vectors
• Calculus: Single variable functions, Taylor series, Fourier series, Gauss, Stokes and Green’s theorems
• Differential Equations: First and higher order equations, Euler-Cauchy equation, Laplace transforms
• Complex Variables: Analytic functions, Cauchy-Riemann equations, Taylor and Laurent series
• Probability and Statistics: Probability, mean, median, mode, Binomial, Poisson, Normal distributions
• Numerical Methods: Solutions of algebraic equations, Simpson’s rule, trapezoidal rule

B. Applied Mechanics and Design

• Engineering Mechanics: Free-body diagrams, friction, trusses, kinematics, dynamics, Lagrange’s equation
• Mechanics of Materials: Stress and strain, Mohr’s circle, bending, shear, torsion, Euler’s column theory, thermal stresses
• Theory of Machines: Velocity and acceleration analysis, cams, gears, flywheels, governors, gyroscope
• Vibrations: Free and forced vibrations, damping, resonance, critical speeds
• Machine Design: Static and dynamic loading, fatigue, bolted joints, gears, bearings, springs

C. Fluid Mechanics and Thermal Sciences

• Fluid Mechanics: Fluid statics, Bernoulli’s equation, viscous flow, boundary layer, pipe flow, compressible flow
• Heat Transfer: Heat conduction, convection, radiation, heat exchangers, LMTD, NTU methods
• Thermodynamics: Laws of thermodynamics, pure substances, ideal and real gases, availability
• Applications: Air compressors, power cycles, IC engines, refrigeration, psychrometric chart, turbomachinery

D. Materials, Manufacturing and Industrial Engineering

• Engineering Materials: Material structure, phase diagrams, heat treatment
  Casting, Forming and Joining: Casting design, hot and cold working, forging, rolling, welding, brazing
• Machining and Machine Tools: Cutting tools, tool life, CNC programming, jigs and fixtures
• Metrology and Inspection: Limits, fits, tolerances, measurements, CMM
• Computer Integrated Manufacturing: CAD/CAM, additive manufacturing
• Production Planning: Forecasting, aggregate planning, lean manufacturing, inventory control
• Operations Research: Linear programming, simplex method, PERT, CPM

E. Application in Oil and Gas Business

• Surface facility operation and maintenance (separators, compressors, pumps)
• Artificial lift technology, gas lift, sucker rod pumps
• LPG recovery, gas sweetening, gas dehydration
• Workover rig operations, well completion and testing
• Project management, pipeline, health, safety and environment

3. Chemical Engineering Syllabus

A. Engineering Mathematics

• Linear Algebra: Matrix algebra, linear equations, Eigen values and vectors
• Calculus: Functions, Taylor series, integrals, Stokes, Gauss and Green’s theorems
• Differential Equations: First and higher order equations, Cauchy’s and Euler’s equations, Laplace transforms
• Complex Variables: Complex numbers, polar form, triangle inequality
• Probability and Statistics: Probability, mean, median, mode, Poisson, Normal, Binomial distributions
• Numerical Methods: Solutions of algebraic equations, Simpson’s rule, trapezoidal rule

B. Core Chemical Engineering Topics

Process Calculations and Thermodynamics:

• Mass and energy balances for reacting and non-reacting systems
• Recycle, bypass and purge calculations, Gibb’s phase rule
• Laws of thermodynamics, equation of state, fugacity, VLE, chemical reaction equilibrium

Fluid Mechanics and Mechanical Operations:

Newtonian and non-Newtonian fluids, Bernoulli equation, flow meters, pumps, compressors
Particle size, size reduction, filtration, centrifuge, cyclones, mixing, conveying of solids

Heat Transfer:

Heat conduction, convection, radiation, heat exchangers, evaporators, boiling and condensation

Mass Transfer:

Fick’s laws, molecular diffusion, distillation, absorption, leaching, liquid-liquid extraction, drying, membrane separations (micro-filtration, ultra-filtration, nano-filtration, reverse osmosis)

Chemical Reaction Engineering:

Reaction rates, kinetics, ideal and non-ideal reactors, enzyme kinetics, residence time distribution, heterogeneous catalysis

Instrumentation and Process Control:

Process variable measurement, sensors, P&ID, PID controllers, control valves, closed loop stability, cascade and feed forward control

Plant Design and Economics:

Cost estimation, depreciation, rate of return, payback period, discounted cash flow, equipment sizing

Chemical Technology:

• Sulfuric acid, phosphoric acid, chlor-alkali, fertilizers (Ammonia, Urea)
  Natural products (Pulp, Paper, Sugar, Oil)
• Petroleum refining, petrochemicals, polymerization industries (polyethylene, polypropylene, PVC, polyester)

C. Application in Oil and Gas Business

• Surface facility operations, offshore platforms, artificial lift
• LPG and Naptha recovery, gas sweetening, gas dehydration
• Workover rig operations, well completion and testing
• Project management, pipeline, HSE knowledge

4. Instrumentation Engineering Syllabus

A. Engineering Mathematics

• Linear Algebra: Matrix algebra, linear equations, Eigenvalue and Eigenvectors
• Calculus: Mean value theorems, partial derivatives, Fourier series, Stokes, Gauss and Green’s theorems
• Differential Equations: First and second order equations, Cauchy’s and Euler’s equations, boundary value problems
• Complex Variables: Analytic functions, Cauchy’s theorem, Taylor’s and Laurent’s series, residue theorem
• Probability and Statistics: Probability, mean, median, mode, Normal, Poisson and Binomial distributions
• Numerical Methods: Matrix inversion, non-linear equations, numerical integration, regression and correlation

B. Core Instrumentation Topics

Electricity and Magnetism:

Coulomb’s Law, Gauss’s Law, Biot-Savart’s law, Ampere’s law, Faraday’s law, inductance, magnetic circuits
Electrical Circuits and Machines:

• Voltage and current sources, RLC circuits, Kirchhoff’s laws, Thevenin, Norton theorems
  AC circuits, phasor analysis, resonance, filters
• Single phase transformer, three phase induction motors, efficiency calculations

Signals and Systems:

• Laplace, Fourier and z-transforms, transfer functions, impulse response, convolution
• Discrete time systems, DFT, FFT, IIR and FIR filters

Control Systems:

• Feedback principles, signal flow graphs, Bode plot, Routh and Nyquist criteria, root loci
• Lead-lag compensators, state-space representation, PID controllers, control valves

Analog Electronics:

• Diode, Zener diode, BJT, MOSFET, operational amplifiers
• Adder, integrator, differentiator, active filters, oscillators, phase locked loop

Digital Electronics:

• Combinational logic circuits, Boolean functions, IC families (TTL, CMOS)
• ADC, DAC, flip flops, shift registers, timers, counters
• Microprocessor and microcontroller applications, DCS, PLC

Measurements:

• SI units, systematic and random errors, accuracy and precision
• Wheatstone, Maxwell, Wien bridges, digital voltmeter, digital multimeter, oscilloscope

Sensors and Industrial Instrumentation:

• Resistive, capacitive, inductive, piezoelectric and Hall effect sensors
• Transducers for displacement, velocity, pressure, flow, temperature
• Liquid level, pH, conductivity, viscosity measurement, 4-20 mA transmitters

Communication and Optical Instrumentation:

• Amplitude and frequency modulation, pulse code modulation, multiplexing
• LED, laser, photodiode, fiber optic sensing, UV-VIS spectrophotometers, mass spectrometer

5. Geology Syllabus

A. Section 1 (Basic Geology)

• Earth and Planetary System: Internal structure of earth, isostasy, seismology, geomagnetism, plate tectonics, continental drift
• Weathering and Landforms: Soil formation, landforms from rivers, wind, glaciers, volcanoes
• Structural Geology: Stress and strain, folds, faults, brittle and ductile deformation
• Crystallography and Mineralogy: Crystal symmetry, silicate structures, rock forming minerals
• Petrology: Igneous, sedimentary and metamorphic rocks
• Stratigraphy: Geological time scale, geochronology, stratigraphic divisions of India
• Resources: Mineral, coal and petroleum resources of India
• Remote Sensing: Introduction to remote sensing
• Hydrogeology: Elements of hydrogeologyApplied Geophysics: Gravity, magnetic, electrical, seismic and radiometric methods; well logging

B. Section 2 (Advanced Geology)

• Geomorphology: Geomorphic processes, landform development, tectonic geomorphology
• Structural Geology: Rock deformation, planar and linear structures, stereographic projection, geological maps
• Crystallography and Mineralogy: Crystal symmetry, twinning, crystal chemistry, mineral classification, optical properties
• Geochemistry: Cosmic element abundance, geochemical cycles, crust and mantle composition, water-rock interaction
• Igneous Petrology: Classification, genesis, magmatic differentiation, phase diagrams, mantle plumes
• Sedimentology: Texture, structure, sedimentary facies, basin analysis, sedimentary basins of India
• Metamorphic Petrology: Metamorphic textures, metamorphic facies, thermobarometry, P-T-t paths
• Paleobiology: Diversity of life, mass extinctions, fossilization, invertebrate morphology, microfossils, paleobotany
• Stratigraphy: Lithostratigraphy, biostratigraphy, chronostratigraphy, sequence stratigraphy, Indian stratigraphy
• Resource Geology: Ore mineralogy, ore forming processes, coal and petroleum geology, mineral exploration, geostatistics
• Global Tectonics: Plate motions, plate boundaries, supercontinent cycles
• Applied Geology: Rock and soil properties, rock failure criteria, rock mass classifications, slope stability, natural hazards, climate change
• Hydrogeology: Groundwater flow, well hydraulics, water quality
• Remote Sensing and GIS: Energy sources, multispectral remote sensing, satellite image processing, GIS raster and vector operations

ONGC Graduate Trainee Syllabus 2026 PDF Download Link

Candidates can download the official ONGC Graduate Trainee Syllabus 2026 PDF from the official website. The syllabus PDF is released along with Advertisement No. 2/2026 (R&P). Always download the syllabus from the official source to get the correct and updated information.

ONGC Graduate Trainee Syllabus 2026 PDF Download Link

Steps to Download the Syllabus PDF:

Go to the official ONGC website: www.ongcindia.com
Click on the “Careers” section on the homepage
Look for Advertisement No. 2/2026 (R&P)
Click on the syllabus link for CBT
Download the PDF and save it for reference