The Oil and Natural Gas Corporation (ONGC) has announced a golden opportunity for candidates aspiring to Class I Executive roles in various engineering and technical disciplines. With 108 vacancies, understanding the syllabus and exam pattern is vital for effective preparation. This guide provides a detailed overview of the ONGC syllabus, exam structure, and preparation strategies.
Table of Contents
Process Overview
The ONGC recruitment process thoroughly evaluates candidates’ technical knowledge, analytical skills, and industry-related expertise through a Computer-Based Test (CBT) and document verification stages.
ONGC Selection Process
| Stage | Description | Applicable Posts |
| Written Examination | CBT assesses technical knowledge and general aptitude. | All applicants |
| Personal Interview | Verification of academic and professional credentials. | Shortlisted candidates |
ONGC Exam Pattern
| Stage | Component | Marks |
| CBT (Written Exam) | Concerned Subject | 40 |
| General Awareness | 10 | |
| Aptitude | 25 | |
| English Language | 10 | |
| Total CBT Marks | 85 | |
| Interview | Personal Interaction | 15 |
| Total Interview Marks | 15 |
Total Marks: 100
- Duration: 2 hours
- CBT: 85
- Interview: 15
- Negative Marking: 0.25 marks are deducted for each incorrect answer.
Syllabus for ONGC Class I Executive Posts
Written Examination
1. Mechanical Engineering
| Section | Subtopics | Marks | Examples |
| Engineering Mathematics | Linear Algebra, Calculus, Differential Equations, Complex Variables, Probability & Statistics | 5 | Solve eigenvalue problems or evaluate vector integrals. |
| Thermal Sciences | Fluid Mechanics, Heat Transfer, Thermodynamics, Power Cycles. | 10 | Analyze fluid flow in a pipeline or calculate the efficiency of a Rankine cycle. |
| Machine Design | Design of Machine Elements, Failure Theories, Fatigue, Shafts, Gears. | 7 | Design a shaft for a given load or calculate the safety factor for a gear system. |
| Manufacturing | Casting, Forming, Welding, Machining Processes, Additive Manufacturing. | 7 | Questions on defects in casting or optimization of tool life during machining. |
| Applied Mechanics | Stress-Strain, Kinematics, Dynamics, Vibrations. | 6 | Solve for stresses in a cantilever beam or analyze the motion of a mechanism. |
| General Awareness | ONGC Operations, Current Affairs, Energy Sector. | 10 | Identify ONGC’s recent oil discovery projects. |
| Aptitude | Quantitative Aptitude, Logical Reasoning, Data Interpretation. | 25 | Solve seating arrangement puzzles or analyze numerical data. |
| English Language | Grammar, Vocabulary, Comprehension. | 10 | Identify grammatical errors or interpret comprehension passages. |
2. Electrical Engineering
| Section | Subtopics | Marks | Examples |
| Engineering Mathematics | Linear Algebra, Calculus, Differential Equations, Complex Variables, Probability & Statistics. | 5 | Solve eigenvalue problems, evaluate integrals, or calculate the mean and standard deviation. |
| Electric Circuits | Network Theorems, Resonance, Transient Response, Two-Port Networks. | 5 | Solve for current using Thevenin’s theorem or calculate resonance frequency. |
| Electromagnetic Fields | Electrostatics, Magnetostatics, Maxwell’s Equations, Electromagnetic Waves. | 5 | Analyze wave propagation or calculate the magnetic field in a loop. |
| Electrical Machines | Transformers, DC Machines, Induction Machines, Synchronous Machines, Special Machines. | 7 | Analyze torque-speed characteristics of an induction motor or calculate transformer efficiency. |
| Power Systems | Power Generation, Transmission Lines, Fault Analysis, Load Flow, and Protection Systems. | 5 | Solve load flow problems using the Gauss-Seidel method or explain transformer protection schemes. |
| Control Systems | Open/Closed-Loop Systems, Stability Analysis, Controllers, State-Space Analysis. | 5 | Design a PID controller or analyze system stability using Bode plots. |
| Analog & Digital Electronics | Diodes, Transistors, Amplifiers, Op-Amps, Logic Circuits, A/D & D/A Converters. | 4 | Design a 4-bit counter or analyze the frequency response of an amplifier. |
| Power Electronics | Semiconductor Devices, Converters (Buck, Boost), Inverters, PWM Techniques. | 4 | Design a Buck converter or analyze the output waveform of an inverter. |
| Measurements & Instrumentation | Measurement Techniques, Transducers, Digital Instruments. | 5 | Explain how to measure power factor or describe a digital oscilloscope’s working. |
| General Awareness | ONGC-Specific Topics, Current Affairs, Energy Sector Knowledge. | 10 | Identify ONGC projects or describe recent energy sector developments. |
| Aptitude | Quantitative Aptitude, Logical Reasoning, Data Interpretation. | 25 | Solve seating arrangement puzzles or analyze numerical data. |
| English Language | Grammar, Vocabulary, Comprehension. | 10 | Identify grammatical errors or answer questions based on a passage. |
3. Petroleum Engineering
| Section | Subtopics | Marks | Examples |
| Drilling Technology | Rig Operations, Drilling Fluids, Well Completion | 10 | Identify tools used in offshore drilling or calculate fluid loss in wells. |
| Reservoir Engineering | Fluid Flow, Recovery Mechanisms, Pressure Analysis | 10 | Calculate reservoir pressure drop or analyze fluid flow in a porous medium. |
| Production Operations | Artificial Lift Methods, Field Processing, Metering | 10 | Explain gas lift systems or describe the operation of a separator. |
| Offshore & Onshore Operations | Subsea Technology, Well Testing, Platform Management | 5 | Questions on offshore rig stability or well-stimulation techniques. |
| Health, Safety, and Environment | Safety Protocols, Disaster Management, Environmental Impact | 5 | Develop safety measures for a gas processing plant or evaluate the environmental impact of spills. |
| General Awareness | ONGC Projects, Energy Sector Updates | 10 | Identify ONGC’s contributions to renewable energy. |
| Aptitude | Quantitative Aptitude, Logical Reasoning | 25 | Solve problems involving numerical patterns or logical relationships. |
| English Language | Grammar, Vocabulary, Comprehension | 10 | Answer comprehension questions or identify grammar errors. |
4. Geology and Geophysics
| Section | Subtopics | Marks | Examples |
| Geology | Structural Geology, Petrophysics, Stratigraphy, Geochemistry. | 10 | Interpret geological maps or analyze the petrophysical properties of a formation. |
| Geophysics | Seismology, Well Logging, Remote Sensing, GIS. | 10 | Solve problems with seismic wave propagation or logging interpretation. |
| Mineralogy & Petrology | Crystal Symmetry, Rock Types, Rock Mechanics. | 7 | Questions on the classification of igneous rocks or mineral properties. |
| Hydrogeology | Groundwater Flow, Well Hydraulics, Water Quality. | 6 | Analyze aquifer recharge or water-rock interaction. |
| Environmental Geology | Natural Hazards, Climate Change, Resource Management. | 7 | Assess the impact of drilling operations on ecosystems or mitigation measures for landslides. |
| General Awareness | ONGC Exploration Activities, Current Affairs. | 10 | Questions on ONGC’s petroleum reserves or energy sector trends. |
| Aptitude | Quantitative Aptitude, Logical Reasoning. | 25 | Solve numerical reasoning puzzles or data interpretation tasks. |
| English Language | Grammar, Vocabulary, Comprehension. | 10 | Identify synonyms/antonyms or summarize comprehension passages. |
5. Chemical Engineering
| Section | Subtopics | Marks | Examples |
| Process Calculations | Mass/Energy Balances, Recycle, Phase Equilibria. | 10 | Solve material balance problems for distillation columns. |
| Thermodynamics | Laws of Thermodynamics, Fugacity, Chemical Reactions. | 10 | Calculate the efficiency of a refrigeration cycle or predict reaction equilibrium. |
| Mass Transfer | Distillation, Absorption, Leaching, Extraction. | 7 | Design a distillation column for separating components. |
| Heat Transfer | Conduction, Convection, Radiation, Heat Exchangers. | 7 | Analyze the thermal efficiency of a shell-and-tube heat exchanger. |
| Instrumentation & Control | Process Control, Sensors, PID Controllers. | 6 | Design a control loop or select appropriate transducers for a process. |
| Chemical Reaction Engineering | Reactor Design, Reaction Kinetics, Catalysis. | 5 | Solve for conversion in a chemical reactor using first-order kinetics. |
| General Awareness | ONGC Chemical Operations, Current Affairs. | 10 | Questions on ONGC’s LPG production processes or recent petrochemical advances. |
| Aptitude | Quantitative Aptitude, Logical Reasoning. | 25 | Analyze numerical data or solve logical reasoning problems. |
| English Language | Grammar, Vocabulary, Comprehension. | 10 | Write synonyms/antonyms or summarize passages. |
General Awareness Syllabus
| Subtopics | Details | Marks | Examples |
| Current Affairs | National and international events, government schemes, and economic updates. | 2 | Questions about recent energy sector developments or government policies. |
| ONGC-Specific Topics | ONGC operations, projects, and contributions to the energy sector. | 2 | Identify ONGC’s latest oil exploration projects or renewable energy initiatives. |
| Indian Economy | Economic terms, GDP, inflation, and budget highlights. | 1 | Define inflation or explain the significance of the Union Budget. |
| Science and Technology | Recent advancements, space exploration, and energy innovations. | 1 | Questions on ISRO missions or renewable energy technologies. |
| History and Culture | Indian independence movement, cultural heritage, and prominent historical events. | 1 | Identify leaders of the Indian independence struggle or cultural landmarks. |
| Geography | Physical geography, Indian geography, and world geography. | 1 | Explain the monsoon system in India or locate major petroleum reserves globally. |
| Polity | Indian Constitution, governance structure, and important acts. | 1 | Questions on fundamental rights or key constitutional amendments. |
| Environment and Ecology | Environmental laws, climate change, and sustainability initiatives. | 1 | Assess the impact of deforestation or identify sustainable energy practices. |
Total Marks: 10
Aptitude Syllabus
| Subtopics | Details | Marks | Examples |
| Quantitative Aptitude | 15 | ||
| Arithmetic | Percentages, profit, and loss, ratio and proportion, averages. | 5 | Calculate the percentage profit in a transaction. |
| Algebra | Linear equations, quadratic equations, and polynomials. | 3 | Solve for x in a quadratic equation. |
| Geometry and Mensuration | Area, volume, perimeter, angles, and trigonometry basics. | 4 | Calculate the surface area of a cylinder or find the angle in a triangle. |
| Data Interpretation | Graphs, charts, and tables. | 3 | Interpret data from a bar graph or pie chart. |
| Logical Reasoning | 10 | ||
| Puzzles | Seating arrangement, blood relations, and logical sequencing. | 4 | Solve a family tree puzzle or seating arrangement problem. |
| Pattern Recognition | Number series, letter series, and analogy. | 3 | Find the missing number in a series or identify analogies. |
| Syllogisms and Statements | Statement-conclusion and cause-effect relationships. | 2 | Identify the correct conclusion from a set of statements. |
| Coding-Decoding | Alphanumeric codes, symbol substitution. | 1 | Decode a message using a given coding pattern. |
Total Marks: 25
English Language
| Subtopics | Details | Marks | Examples |
| Grammar | 4 | ||
| Parts of Speech | Nouns, pronouns, adjectives, verbs, adverbs, prepositions, conjunctions, interjections. | 2 | Identify the parts of speech in a given sentence. |
| Sentence Structure | Subject-verb agreement, modifiers, and parallel structure. | 1 | Correct errors in subject-verb agreement. |
| Tenses | Present, past, and future tenses with appropriate usage. | 1 | Convert a sentence into the correct tense. |
| Vocabulary | 3 | ||
| Synonyms and Antonyms | Identify words with similar or opposite meanings. | 1.5 | Find the synonym of “benevolent” or the antonym of “hostile.” |
| Idioms and Phrases | Common English idioms and their meanings. | 1 | Explain the meaning of “burning the midnight oil.” |
| Word Usage | Correct usage of words in context. | 0.5 | Choose the correct word to complete a sentence. |
| Comprehension | 3 | ||
| Passage Reading | Understanding and interpreting written text. | 2 | Answer questions based on a given passage. |
| Sentence Rearrangement | Rearranging jumbled sentences to form coherent paragraphs. | 1 | Arrange sentences to create a meaningful paragraph. |
| Error Detection | Identifying grammatical or contextual errors in sentences. | 2 | Spot the grammatical error in a given sentence. |
Total Marks: 10
Key Features of Post-Specific Syllabus
- Engineering roles emphasize technical expertise in respective disciplines.
- Science roles require domain-specific knowledge and industry applications.
Recommended Books and Resources
| Topic | Recommended Books |
| General Awareness | Lucent’s General Knowledge |
| Technical Knowledge | GATE Preparation Books (Discipline-Specific) |
| Reasoning and Aptitude | A Modern Approach to Verbal & Non-Verbal Reasoning by R.S. Aggarwal |
| English | Word Power Made Easy by Norman Lewis |
Strategic Preparation Plan for ONGC Recruitment 2025
| Time Slot | Activity | Focus Area |
| Morning | Subject Revision | Core Technical Knowledge |
| Afternoon | Mock Tests | Familiarity with Exam Pattern |
| Evening | Current Affairs and Reasoning | General Awareness and Analytical Skills |
Common Mistakes to Avoid
- Ignoring Post-Specific Preparation: Focus on the technical knowledge section as it carries the most weight.
- Skipping Mock Tests: Regular practice is crucial for time management.
- Neglecting ONGC Updates: Stay informed about organizational updates through official channels.
Important Links
| Title | Link |
| ONGC Official Website | Click Here |
| Recruitment Notification | Click Here |
| Join Our WhatsApp Channel | Join Now |
Conclusion
ONGC Recruitment 2025 offers an exceptional opportunity for candidates to join one of India’s leading public sector enterprises. A clear understanding of the syllabus, exam pattern, and dedicated preparation can help you secure your dream role. Start your journey today and aim for success!
FAQs
What are the eligibility criteria for ONGC posts?
Candidates must meet the educational and professional qualifications outlined in the official notification.
How many vacancies are available?
A total of 108 vacancies have been announced.
Is there a negative mark on the exam?
Yes, 0.25 marks are deducted for every incorrect answer.
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