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Engineering & Technical
NationalGovt2026 cycle

ONGC AEE

Oil & Natural Gas Corporation

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Domain
Engineering & Technical
Level
National
Type
Govt
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Exam snapshot

Overview

Conducting body

Oil & Natural Gas Corporation

What you get

Assistant Executive Engineer posts at ONGC

Latest content cycle

2026

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Worth preparing alongside

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Plan with confidence

Complete exam guide

Eligibility, pattern, syllabus, dates and official resources in one structured view.

Eligibility
Exam pattern

Qualification pathway

Clear each applicable stage in order

Final selection or admission still depends on the published cutoff or merit list and any applicable counselling, document, medical, preference and vacancy rules.

Selection sequence

  1. 1

    Computer Based Test (CBT)

    Required

    CBT score is used to shortlist candidates in a 1:5 ratio for the Personal Interview. Where multiple candidates secure the minimum cut-off marks, all of them are shortlisted in relaxation of the ratio. To qualify in the CBT, General/EWS/OBC candidates must score a minimum of 45% marks and SC/ST/PwBD candidates a minimum of 40%.

  2. 2

    Personal Interview

    Required

    To qualify in the interview, General/EWS/OBC candidates must score a minimum of 60% i.e. 9 marks out of 15, and SC/ST/PwBD candidates a minimum of 40% i.e. 6 marks out of 15.

  3. 3

    Medical Examination

    Required

    Candidates who qualify in the interview are called for medical examination in order of their relative rank in the merit list. An offer of appointment is issued only to candidates declared medically fit; mere appearance in the medical examination confers no right to appointment.

Paper and stage details

What each stage contains

3 records

Computer Based Test (CBT)

Objective type, multiple choice, 85 questions in 2 hours

Questions

Not stated

Maximum marks

Not stated

Duration

Not stated

Personal Interview

Interview; shortlisted candidates may also be subjected to a Group Discussion, which is not of a qualifying nature

Questions

Not stated

Maximum marks

Not stated

Duration

Not stated

Medical Examination

Medical fitness examination under the ONGC Medical Examination of Employees Rules

Questions

Not stated

Maximum marks

Not stated

Duration

Not stated

Syllabus

Showing 420 of 950 topics, across all 8 subjects and 86 chapters.Nothing has been dropped. Every subject links to its full topic list.

Petroleum Engineering16 chapters · 189 trackable topics
  • Linear Algebra

    3 topics

    • Matrix algebra
    • Systems of linear equations
    • Eigen values and eigen vectors
  • Calculus

    3 of 17 topics

    • Functions of single variable
    • Limit
    • continuity and differentiability
  • Differential Equations

    3 of 6 topics

    • First order equations (linear and nonlinear)
    • Higher order linear differential equations with constant coefficients
    • Cauchy’s and Euler’s equations
  • Complex Variables

    3 topics

    • Complex number
    • polar form of complex number
    • triangle inequality
  • Probability and Statistics

    3 of 9 topics

    • Definitions of probability and sampling theorems
    • Conditional probability
    • Mean
  • Numerical Methods

    3 topics

    • Numerical solutions of linear and non-linear algebraic equations
    • Integration by trapezoidal and Simpson’s rule
    • Single and multi-step methods for numerical solution of differential equations
  • Petroleum Exploration

    3 of 4 topics

    • Classification and description of some common rocks with special reference to clastic and nonelastic reservoir rocks
    • Origin
    • migration and accumulation of Petroleum
  • Oil and Gas Well Drilling Technology

    3 of 18 topics

    • Well planning
    • Drilling method
    • Drilling rigs Rig operating systems
  • Reservoir Engineering

    3 of 10 topics

    • Petrophysical properties of reservoir rocks
    • Coring and core analysis
    • Reservoir fluid properties
  • Petroleum Production Operations

    3 of 20 topics

    • Well equipments
    • Well completion techniques
    • Well production problems and mitigation
  • Offshore Drilling and Production Practices

    3 of 17 topics

    • Offshore oil and gas operations & ocean environment
    • Offshore fixed platforms
    • Offshore mobile units
  • Petroleum Formation Evaluation

    3 of 16 topics

    • Evaluation of petrophysical of sub-surface formations: Principles applications
    • advantages and disadvantages of SP
    • resistivity
  • Oil and Gas Well Testing

    3 of 15 topics

    • Diffusivity equation
    • derivation & solutions
    • Radius of investigation
  • Health Safety and Environment in Petroleum Industry

    3 of 20 topics

    • Health hazards in Petroleum Industry: Toxicity
    • Physiological
    • Asphyxiation
  • Enhanced Oil Recovery Techniques

    3 of 14 topics

    • Basic principles and mechanism of EOR
    • Screening of EOR process
    • Concept of pattern flooding
  • Application in Oil & Gas Business

    3 of 14 topics

    • Operation & maintenance of Surface facilities (Separator, heater treater, crude stabilization, Storage tank, static equipment, compressor & pumps etc.)
    • Operation of Group gathering stations
    • offshore Platforms

Showing 48 of 189 topics in this subject.Show all 189 topics →

Mechanical Engineering25 chapters · 223 trackable topics
  • Linear Algebra

    3 topics

    • Matrix algebra
    • systems of linear equations
    • eigen values and eigen vectors
  • Calculus

    3 of 20 topics

    • Functions of single variable
    • limit
    • continuity and differentiability
  • Differential Equations

    3 of 7 topics

    • First order equations (linear and nonlinear)
    • higher order linear differential equations with constant coefficients
    • Euler-Cauchy equation
  • Complex Variables

    3 of 4 topics

    • Analytic functions
    • Cauchy-Riemann equations
    • Cauchy’s integral theorem and integral formula
  • Probability and Statistics

    3 of 9 topics

    • Definitions of probability
    • sampling theorems
    • conditional probability
  • Numerical Methods

    3 topics

    • Numerical solutions of linear and non-linear algebraic equations
    • integration by trapezoidal and Simpson’s rules
    • single and multi-step methods for differential equations
  • Engineering Mechanics

    3 of 13 topics

    • Free-body diagrams and equilibrium
    • friction and its applications including rolling friction
    • belt-pulley
  • Mechanics of Materials

    3 of 16 topics

    • Stress and strain
    • elastic constants
    • Poisson's ratio
  • Theory of Machines

    3 of 8 topics

    • Displacement
    • velocity and acceleration analysis of plane mechanisms
    • dynamic analysis of linkages
  • Vibrations

    3 of 5 topics

    • Free and forced vibration of single degree of freedom systems
    • effect of damping
    • vibration isolation
  • Machine Design

    3 of 10 topics

    • Design for static and dynamic loading
    • failure theories
    • fatigue strength and the S-N diagram
  • Fluid Mechanics

    3 of 17 topics

    • Fluid properties
    • fluid statics
    • forces on submerged bodies
  • Heat Transfer

    3 of 19 topics

    • Modes of heat transfer
    • one dimensional heat conduction
    • resistance concept and electrical analogy
  • Thermodynamics

    3 of 9 topics

    • Thermodynamic systems and processes
    • properties of pure substances
    • behavior of ideal and real gases
  • Applications

    3 of 9 topics

    • Power Engineering: Air and gas compressors
    • vapour and gas power cycles
    • concepts of regeneration and reheat
  • Turbomachinery

    3 of 5 topics

    • Impulse and reaction principles
    • velocity diagrams
    • Pelton-wheel
  • Engineering Materials

    3 of 4 topics

    • Structure and properties of engineering materials
    • phase diagrams
    • heat treatment
  • Casting, Forming and Joining Processes

    3 of 12 topics

    • Different types of castings
    • design of patterns
    • moulds and cores
  • Machining and Machine Tool Operations

    3 of 11 topics

    • Mechanics of machining
    • basic machine tools
    • single and multi-point cutting tools
  • Metrology and Inspection

    3 of 9 topics

    • Limits
    • fits and tolerances
    • linear and angular measurements
  • Computer Integrated Manufacturing

    2 topics

    • Basic concepts of CAD/CAM and their integration tools
    • additive manufacturing
  • Production Planning and Control

    3 of 5 topics

    • Forecasting models
    • aggregate production planning
    • scheduling
  • Inventory Control

    2 topics

    • Deterministic models
    • safety stock inventory control systems
  • Operations Research

    3 of 7 topics

    • Linear programming
    • simplex method
    • transportation
  • Application in Oil & Gas Business

    3 of 14 topics

    • Operation & maintenance of Surface facilities (Separator, heater treater, crude stabilization, Storage tank, static equipment, compressor & pumps etc.)
    • Operation of Group gathering stations
    • offshore Platforms

Showing 73 of 223 topics in this subject.Show all 223 topics →

Chemical Engineering15 chapters · 161 trackable topics
  • Linear Algebra

    3 topics

    • Matrix algebra
    • Systems of linear equations
    • Eigen values and eigenvectors
  • Calculus

    3 of 17 topics

    • Functions of single variable
    • Limit
    • continuity and differentiability
  • Differential Equations

    3 of 6 topics

    • First order equations (linear and nonlinear)
    • Higher order linear differential equations with constant coefficients
    • Cauchy’s and Euler’s equations
  • Complex Variables

    3 topics

    • Complex number
    • polar form of complex number
    • triangle inequality
  • Probability and Statistics

    3 of 9 topics

    • Definitions of probability and sampling theorems
    • Conditional probability
    • Mean
  • Numerical Methods

    3 topics

    • Numerical solutions of linear and non-linear algebraic equations
    • Integration by trapezoidal and Simpson’s rule
    • Single and multi-step methods for numerical solution of differential equations
  • Process Calculations and Thermodynamics

    3 of 16 topics

    • Steady and unsteady state mass and energy balances including multiphase
    • multi-component
    • reacting and non-reacting systems
  • Fluid Mechanics and Mechanical Operations

    3 of 27 topics

    • Fluid statics
    • surface tension
    • Newtonian and non-Newtonian fluids
  • Heat Transfer

    3 of 9 topics

    • Equation of energy
    • steady and unsteady heat conduction
    • convection and radiation
  • Mass Transfer

    3 of 17 topics

    • Fick’s laws
    • molecular diffusion in fluids
    • mass transfer coefficients
  • Chemical Reaction Engineering

    3 of 12 topics

    • Theories of reaction rates
    • kinetics of homogeneous reactions
    • interpretation of kinetic data
  • Instrumentation and Process Control

    3 of 14 topics

    • Measurement of process variables
    • sensors and transducers
    • P&ID equipment symbols
  • Plant Design and Economics

    3 of 6 topics

    • Principles of process economics and cost estimation including depreciation and total annualized cost
    • cost indices
    • rate of return
  • Chemical Technology

    3 of 5 topics

    • Inorganic chemical industries (sulfuric acid, phosphoric acid, chlor-alkali industry)
    • fertilizers (Ammonia, Urea, SSP and TSP)
    • natural products industries (Pulp and Paper, Sugar, Oil, and Fats)
  • Application in Oil & Gas Business

    3 of 14 topics

    • Operation & maintenance of Surface facilities (Separator, heater treater, crude stabilization, Storage tank, static equipment, compressor & pumps etc.)
    • Operation of Group gathering stations
    • offshore Platforms

Showing 45 of 161 topics in this subject.Show all 161 topics →

Instrumentation Engineering15 chapters · 223 trackable topics
  • Linear Algebra

    4 topics

    • Matrix algebra
    • systems of linear equations
    • consistency and rank
    • Eigenvalue and Eigenvectors
  • Calculus

    11 topics

    • Mean value theorems
    • theorems of integral calculus
    • partial derivatives
    • maxima and minima
    • multiple integrals
    • Fourier series
    • vector identities
    • line
    • surface and volume integrals
    • Stokes
    • Gauss and Green’s theorems
  • Differential Equations

    6 topics

    • First order equation (linear and nonlinear)
    • second order linear differential equations with constant coefficients
    • method of variation of parameters
    • Cauchy’s and Euler’s equations
    • initial and boundary value problems
    • solution of partial differential equations: variable separable method
  • Analysis of Complex Variables

    5 topics

    • Analytic functions
    • Cauchy’s integral theorem and integral formula
    • Taylor’s and Laurent’s series
    • residue theorem
    • solution of integrals
  • Probability and Statistics

    8 topics

    • Sampling theorems
    • conditional probability
    • mean
    • median
    • mode
    • standard deviation and variance
    • random variables: discrete and continuous distributions: normal
    • Poisson and binomial distributions
  • Numerical Methods

    5 topics

    • Matrix inversion
    • solutions of non-linear algebraic equations
    • iterative methods for solving differential equations
    • numerical integration
    • regression and correlation analysis
  • Electricity and Magnetism

    20 topics

    • Coulomb's Law
    • Electric Field Intensity
    • Electric Flux Density
    • Gauss's Law
    • Divergence
    • Electric field and potential due to point
    • line
    • plane and spherical charge distributions
    • Effect of dielectric medium
    • Capacitance of simple configurations
    • Biot‐Savart’s law
    • Ampere’s law
    • Curl
    • Faraday’s law
    • Lorentz force
    • Inductance
    • Magnetomotive force
    • Reluctance
    • Magnetic circuits
    • Self and Mutual inductance of simple configurations
  • Electrical Circuits and Machines

    37 topics

    • Voltage and Current Sources
    • Independent
    • dependent
    • ideal and practical
    • v-i relationships of resistor
    • inductor
    • mutual inductance and capacitor
    • transient analysis of RLC circuits with dc excitation
    • Kirchoff’s laws
    • mesh and nodal analysis
    • superposition
    • Thevenin
    • Norton
    • maximum power transfer and reciprocity theorems
    • Peak-, average- and rms values of AC quantities
    • apparent-, active- and reactive powers
    • phasor analysis
    • impedance and admittance
    • series and parallel resonance
    • locus diagrams
    • realization of basic filters with R, L and C elements
    • transient analysis of RLC circuits with ac excitation
    • One-port and two-port networks
    • driving point impedance and admittance
    • open-, and short circuit parameters
    • Single Phase Transformer
    • Equivalent circuit
    • phasor diagram
    • open circuit and short circuit tests
    • regulation and efficiency
    • Three phase induction motors: principle of operation
    • types
    • performance
    • torque-speed characteristics
    • no-load and blocked rotor tests
    • starting and speed control
    • Types of losses and efficiency calculations of electric machines
  • Signals and Systems

    14 topics

    • Periodic
    • aperiodic and impulse signals
    • Laplace
    • Fourier and z-transforms
    • transfer function
    • frequency response of first and second order linear time invariant systems
    • impulse response of systems
    • convolution
    • correlation
    • Discrete time system: impulse response
    • frequency response
    • pulse transfer function
    • DFT and FFT
    • basics of IIR and FIR filters
  • Control Systems

    21 topics

    • Feedback principles
    • signal flow graphs
    • transient response
    • steady-state-errors
    • Bode plot
    • phase and gain margins
    • Routh and Nyquist criteria
    • root loci
    • design of lead
    • lag and leadlag compensators
    • state-space representation of systems
    • time-delay systems
    • mechanical
    • hydraulic and pneumatic system components
    • synchro pair
    • servo and stepper motors
    • servo valves
    • on-off, P, PI, PID
    • cascade
    • feed forward, and ratio controllers
    • tuning of PID controllers and sizing of control valves
  • Analog Electronics

    18 topics

    • Characteristics and applications of diode
    • Zener diode
    • BJT and MOSFET
    • small signal analysis of transistor circuits
    • feedback amplifiers
    • Characteristics of ideal and practical operational amplifiers
    • applications of opamps: adder
    • subtractor
    • integrator
    • differentiator
    • difference amplifier
    • instrumentation amplifier
    • precision rectifier
    • active filters
    • oscillators
    • signal generators
    • voltage controlled oscillators and phase locked loop
    • sources and effects of noise and interference in electronic circuits
  • Digital Electronics

    20 topics

    • Combinational logic circuits
    • minimization of Boolean functions
    • IC families: TTL and CMOS
    • Arithmetic circuits
    • comparators
    • Schmitt trigger
    • multi-vibrators
    • sequential circuits
    • flipflops
    • shift registers
    • timers and counters
    • sample-and-hold circuit
    • multiplexer
    • analogto-digital (successive approximation, integrating, flash and sigma-delta) and digital-toanalog converters (weighted R, R-2R ladder and current steering logic)
    • Characteristics of ADC and DAC (resolution, quantization, significant bits, conversion/settling time)
    • basics of number systems
    • Embedded Systems: Microprocessor and microcontroller applications
    • memory and input-output interfacing
    • basics of data acquisition systems
    • basics of distributed control systems (DCS) and programmable logic controllers (PLC)
  • Measurements

    26 topics

    • SI units
    • standards (R, L, C, voltage, current and frequency)
    • systematic and random errors in measurement
    • expression of uncertainty - accuracy and precision
    • propagation of errors
    • linear and weighted regression
    • Bridges: Wheatstone
    • Kelvin
    • Megohm
    • Maxwell
    • Anderson
    • Schering and Wien for measurement of R, L, C and frequency
    • Q-meter
    • Measurement of voltage
    • current and power in single and three phase circuits
    • ac and dc current probes
    • true rms meters
    • voltage and current scaling
    • instrument transformers
    • timer/counter
    • time
    • phase and frequency measurements
    • digital voltmeter
    • digital multimeter
    • oscilloscope
    • shielding and grounding
  • Sensors and Industrial Instrumentation

    13 topics

    • Resistive-, capacitive-, inductive-, piezoelectric-, Hall effect sensors and associated signal conditioning circuits
    • transducers for industrial instrumentation: displacement (linear and angular)
    • velocity
    • acceleration
    • force
    • torque
    • vibration
    • shock
    • pressure (including low pressure)
    • flow (variable head, variable area, electromagnetic, ultrasonic, turbine and open channel flow meters) temperature (thermocouple, bolometer, RTD (3/4 wire), thermistor, pyrometer and semiconductor)
    • liquid level, pH
    • conductivity and viscosity measurement
    • 4- 20 mA two-wire transmitter
  • Communication and Optical Instrumentation

    15 topics

    • Amplitude- and frequency modulation and demodulation
    • Shannon's sampling theorem
    • pulse code modulation
    • frequency and time division multiplexing
    • amplitude-, phase-, frequency-, quadrature amplitude
    • pulse shift keying for digital modulation
    • optical sources and detectors: LED
    • laser
    • photo-diode
    • light dependent resistor
    • square law detectors and their characteristics
    • interferometer: applications in metrology
    • basics of fiber optic sensing
    • UV-VIS Spectrophotometers
    • Mass spectrometer

Showing all 223 topics in this subject.Show fewer topics

Geology15 chapters · 154 trackable topics
  • Section 1

    3 of 44 topics

    • Earth and planetary system – terrestrial planets and moons of the solar system
    • size
    • shape
  • Geomorphology

    2 of 3 topics

    • Geomorphic processes and agents
    • development and evolution of landforms in continental and oceanic settings
  • Structural Geology

    2 of 11 topics

    • Forces and mechanism of rock deformation
    • primary and secondary structures
  • Crystallography and Mineralogy

    2 of 6 topics

    • Elements of crystal symmetry
    • form and twinning
  • Geochemistry

    2 of 10 topics

    • Cosmic abundance of elements
    • meteorites
  • Igneous Petrology

    2 of 8 topics

    • Classification
    • forms
  • Sedimentology

    2 of 7 topics

    • Texture
    • structure and sedimentary processes
  • Metamorphic Petrology

    2 of 8 topics

    • Structures and textures of metamorphic rocks
    • Physico-chemical conditions of metamorphism and concept of metamorphic facies
  • Paleobiology

    2 of 11 topics

    • Diversity of life through time
    • mass extinctions- causes and effects
  • Stratigraphy

    2 of 6 topics

    • Principles of stratigraphy and concepts of correlation
    • Lithostratigraphy
  • Resource Geology

    2 of 12 topics

    • Ore-mineralogy
    • ore forming processes vis-à-vis ore-rock association (magmatic, hydrothermal, sedimentary, supergene and metamorphogenic ores)
  • Global Tectonics

    2 of 4 topics

    • Plate motions
    • driving mechanisms
  • Applied Geology

    2 of 12 topics

    • Physico-mechanical properties of rocks and soils
    • rock index tests
  • Hydrogeology

    2 topics

    • Groundwater flow and exploration
    • well hydraulics and water quality
  • Basic Principles of Remote Sensing

    2 of 10 topics

    • energy sources and radiation principles
    • atmospheric absorption

Showing 31 of 154 topics in this subject.Show all 154 topics →

General Awareness0 chapters · 0 trackable topics

Topics pending official syllabus normalization.

Aptitude Test0 chapters · 0 trackable topics

Topics pending official syllabus normalization.

English Language0 chapters · 0 trackable topics

Topics pending official syllabus normalization.

Important dates

2026 cycle

Next confirmed event

Cbt Date: 2026-09-06

Upcoming

What happens next

Confirmed upcoming schedule

As published by the authority

Cbt Date

Upcoming

2026-09-06

Full published timeline3 completed · 0 awaiting dates

Registration Closes

Completed

2026-07-31

Registration Starts

Completed

2026-07-17

Notification Published

Completed

2026-07-16

Job profile & salary

Level

E1

Basic Pay Scale

Rs 60,000 - 1,80,000 per month

Indicative CTC

Approx. Rs 26 lacs CTC, as stated in the advertisement

Posting

Selected candidates are liable to be posted anywhere in India (Asset/Basin/Institute/Plant/HQ etc) or abroad.

Post Allocation

Allocation of ONGC's designated post to a selected candidate is as per the decision of Management, subject to availability of vacancy, and ONGC's decision is final and binding.

Employer

ONGC describes itself in this advertisement as India's Maharatna energy leader contributing over 73% of the nation's oil and 57% of gas production, with a presence in 18 countries and a community of around 22,600 professionals.

Cutoffs
Official cutoff records have not been loaded yet.
Previous-year papers
Official question-paper and answer-key pairs have not been loaded yet.
Books & study sources
Book recommendations have not been reviewed yet.
Official & trusted free resources
Official free resources have not been reviewed yet.
How to apply
Open official application page
  1. 1Visit the ONGC website to register the application online. The registration site remained open from 17/07/2026 to 31/07/2026.
  2. 2Apply for only one academic/engineering stream, chosen on the basis of your qualification. Where multiple applications are received, the latest is final and older ones are rejected.
  3. 3Keep a mobile number and e-mail ID ready - the OTP for completing registration is sent to them - and keep them active for at least one year from the date of registration.
  4. 4Pay the registration fee online.
  5. 5No changes are allowed once the online application has been submitted.
FAQs
Does ONGC still recruit Assistant Executive Engineers through GATE?

Not in the current cycle. Advt. No. 2/2026 (R&P) is titled 'Recruitment of Geologists and Engineers at E1 level through Computer Based Test (CBT)' and selection runs on ONGC's own CBT, a Personal Interview and a Medical Examination. ONGC did use GATE scores for this recruitment up to the GATE-2023 cycle (Advt. No. 1/2024), and moved to its own CBT from Advt. No. 1/2025 onward.

How many questions are in the ONGC CBT and how long is it?

85 multiple choice questions in 2 hours: 40 on the concerned domain, 10 General Awareness, 25 Aptitude and 10 English Language. There is no negative marking.

What score do I need to qualify?

In the CBT, General, EWS and OBC candidates need a minimum of 45% marks and SC/ST/PwBD candidates a minimum of 40%. In the interview, General/EWS/OBC candidates need 60% (9 of 15 marks) and SC/ST/PwBD candidates 40% (6 of 15 marks). Both must be cleared separately to be empanelled.

How much does the CBT score count in the final result?

The CBT carries 85 marks and the interview 15, out of 100.

Which streams are being recruited in 2026 and how many posts?

Five streams with 52 posts in total: Mechanical Engineering 27, Chemical Engineering 10, Petroleum Engineering 9, Geology 4 and Instrumentation Engineering 2.

Can I apply for more than one stream?

No. The advertisement allows an application for only one academic/engineering stream. If several applications are submitted, the latest is taken as final and the earlier ones are rejected.

Final eligibility and dates are always subject to the latest official notification. Content marked “Pending verification” is not presented as verified advice.