IOCL Executive Syllabus 2026 - Download Subject Wise Syllabus PDF

Indian Oil Corporation Limited (IOCL) has released the syllabus for its ongoing recruitment covering Diploma posts (Grade E0), Quality Control (Grade A0), and multiple engineering, law and management disciplines at Grade A. This article brings together the official IOCL syllabus for every post covered in the released documents, along with the common General Aptitude syllabus that applies to all posts. Candidates should read the domain knowledge syllabus for their specific post alongside the General Aptitude syllabus, since both form part of the test.

IOCL Syllabus 2026 - Overview

The table below summarises the posts and grades for which IOCL has released a syllabus, based on the official documents.

IOCL Executive Syllabus 2026 - Direct Link

Indian Oil Corporation Limited has released the official indicative syllabus for IOCL Executive Recruitment 2026. Candidates can check the General Aptitude syllabus applicable to all posts and the separate Domain Knowledge syllabus for Grade A, Grade A0 and Grade E0 posts from the links below.

IOCL General Aptitude Syllabus 2026 (All Posts)

The General Aptitude syllabus is common across all posts and grades Diploma (E0), Quality Control (A0), and all Grade A disciplines. It covers three areas: Verbal Ability of English Language, Quantitative Aptitude, and Logical Reasoning.

1. Verbal Ability of English Language Syllabus

• Basic English grammar: tenses, prepositions, articles, adjectives, conjunctions, verb-noun agreement, and other parts of speech
• Basic vocabulary: words, idioms, and phrases in context
• Reading and comprehension
• Narrative sequencing

2. Quantitative Aptitude Syllabus

• Data interpretation: data graphs (bar graphs, pie charts, and other graphs representing data)
• 2- and 3-dimensional plots, maps, and tables
• Numerical computation and estimation: ratios, percentages, powers, exponents and logarithms, permutations and combinations, and series
• Mensuration and geometry, elementary statistics and probability

3. Logical Reasoning Syllabus

• Logic: deduction and induction, analogy, numerical relations and reasoning
• Transformation of shapes: translation, rotation, scaling, mirroring, assembling, and grouping; paper folding, cutting, and patterns in 2 and 3 dimensions

Also Read: RSSB Lab Assistant Result 2026

IOCL Domain Knowledge Syllabus 2026 - Grade E0 (Diploma Posts)

Grade E0 covers three Diploma-level posts: Electrical, Mechanical, and Safety. Each has its own domain knowledge syllabus, listed below.

1. IOCL Diploma Electrical Syllabus (Grade E0)

• Introduction to Electric Generation Systems
• Electrical Circuit Theory
• Electrical Machines
• Electronic Devices and Circuits
• Power Electronics
• Electrical and Electronic Measurements
• Digital Electronics
• Transducers and Signal Conditioners
• Electric Power Transmission and Distribution
• Microcontroller, Programmable Logic Controller and Microprocessor
• Electrical Estimation, Energy Auditing and Energy Conservation
• Electrical Properties of Materials
• Electrical Machine Controller
• Control Systems - Analysis and Modelling
• Signals and Systems
• Illumination Practices
• Building Electrification
• Renewable Energy Power Plant

2. IOCL Diploma Mechanical Syllabus (Grade E0)

• Basic Mechanical Engineering
• Computer Aided Machine Drawing
• Material Science and Engineering
• Fluid Mechanics and Hydraulic Machinery
• Manufacturing Engineering
• Thermal Engineering
• Measurements & Metrology
• Strength of Materials
• Advanced Manufacturing Processes
• Theory of Machines & Mechanisms
• Industrial Engineering & Management
• Design of Machine Elements
• Production and Operations Management
• Pneumatic Tools and System

3. IOCL Diploma Safety Syllabus (Grade E0)

(A) Introduction to Industrial Safety

• Fundamentals of Industrial Safety, importance of workplace safety, safety laws and regulations
• Occupational Health and Safety Standards, Safety Management Systems (SMS)
• Hazard Identification and Risk Assessment (HIRA), Personal Protective Equipment (PPE)
• Emergency Response Planning, Accident Investigation and Reporting
• Behavior-Based Safety (BBS): human factors in safety, motivation, safety culture development, and psychological aspects of accidents

(B) Industrial Hazards and Risk Management

• Types of industrial hazards (physical, chemical, biological, ergonomic)
• Fire and explosion hazards, electrical hazards and safety measures
• Chemical exposure and toxicity management
• Noise and vibration hazards, confined space safety, working at heights safety
• Machine guarding and Lockout/Tagout (LOTO), radiation hazards and control measures

(C) Fire Prevention and Safety Management

• Causes and classification of fires, fire prevention strategies
• Fire detection and alarm systems, fire extinguishers (types and usage)
• Fixed fire suppression systems (sprinklers, CO2, foam)
• Emergency evacuation procedures, fire safety drills and training
• Flammable and combustible material handling

(D) Electrical Safety and Hazard Control

• Basics of electrical safety, electrical accidents and their causes
• Electrical protective devices (circuit breakers, fuses, RCDs)
• Earthing and grounding systems, electrical maintenance best practices
• Lockout/Tagout (LOTO) procedures, safe use of electrical tools and equipment

(E) Mechanical Safety and Machine Maintenance

• Introduction to mechanical hazards, safe use of industrial machinery
• Importance of preventive maintenance, lubrication and wear prevention
• Bearing and gear maintenance, vibration analysis for fault detection
• Failure Modes and Effects Analysis (FMEA), safety in heavy machinery operations

(F) Chemical Safety and Hazardous Material Handling

• Classification of hazardous substances, Safety Data Sheets (SDS) and labelling
• Safe storage and transportation of chemicals, chemical spill management and response
• Toxicology and exposure limits, personal protective measures for chemical handling
• Hazardous waste management and disposal, industrial ventilation and fume control
• Safety mandates for bulk storage tanks, pipelines, gas cylinders, and hazardous chemical transportation

(G) Construction Safety

• Safety in excavation, scaffolding, demolition, piling, and working at heights

(H) Maintenance Safety

• Confined space entry protocols, work permits, and safety during shutdowns

(I) Industrial Legislation & Labour Laws

• The Factories Act, 1948: roles and responsibility of Safety Officer; detailed study of Chapters IV (Safety), IV-A (Hazardous Processes), and V (Welfare)
• The Environment Protection Act, 1986: rules on hazardous waste management, air, and water pollution control boards
• The Petroleum Act, The Explosives Act, and The Building and Other Construction Workers (BOCW) Act

IOCL Domain Knowledge Syllabus 2026 - Grade A0 (Quality Control)

1. Technical Competency Related to Testing and Analytical Equipment

Working principles, recent trends, operations and chemistry of analytical equipment:

• HPLC, GC, UV-VIS Spectrophotometer, X-Ray Fluorescence (XRF)
• Micro-coulometer, CHNS, ICP (ICP-OES and ICP-MS)
• Atomic Absorption Spectrometry (AAS)
• Ultraviolet Fluorescence Technology for Sulfur Determination
• Chromatography techniques, Fourier Transform Infrared Spectroscopy (FTIR)
• Karl Fischer Titration, Differential Scanning Calorimetry (DSC)

Basic principles of chemistry techniques:

• Types of titration, indicators, principle of reaction of titration and applications
• Lambert Beer Law and applications, analytical techniques (principle and operation)
• Metal analysis by wet chemistry, units of measurement, ppm to % conversion
• Repeatability, reproducibility and precision
• Analytical standards and CRMs, uncertainty of measurement

Basic physical properties of petroleum and petrochemical products:

• Flash Point, Pour Point, Aniline Point
• Kinematic Viscosity and Viscosity Index, Smoke Point, Octane Number, Cetane Number
• Density, Distillation, Boiling Point Distribution, Aromatics Determination
• Melt Flow Index, UTM (polymer testing), polymer additives and chemistry, crude and physical data

Specification of petroleum products and global standards:

• LPG, Gasoline, HSD, Aviation Fuels, Bitumen, Lubes, PE and PP polymers
• ASTM, ISO, IS standards; ISO/IEC 17025 Testing and Calibration Laboratories

Water Chemistry:

• Physical and chemical properties of water, importance of water properties
• Effluent and drinking water analysis, boiler water chemistry

2. Domain Knowledge: Basic Chemistry

• SI units and conversions, solution chemistry (Normality, Molarity, Molality, ppm, ppb, %)
• Basic chemistry of titration, critical name reactions, elementary thermodynamics
• Catalyst chemistry and significance, liquid and gaseous states
• Nomenclature of organic compounds
• Basic polymer chemistry and Ziegler-Natta catalyst
• Laboratory safety rules, identification of glassware, primary and secondary measurement tools and glassware
• Calibration of spectrophotometer, calibration of balance, solvent polarity
• Boiling and melting points, matter and its states, atoms and molecules
• Chemical bonds: ionic, covalent, metallic
• Chemical reactions: endothermic, exothermic, combustion, synthesis, decomposition, replacement

3. Basic Organic Chemistry

• Hydrocarbons: alkanes, alkenes, alkynes
• Functional group chemistry: alcohols, ketones, acids

4. Laboratory Safety

• Chemical storage and labelling
• Personal protective equipment
• Safe handling of glassware
• Safe/unsafe conditions, acts and near miss

Also Read: RSSB Forester Result 2026

IOCL Domain Knowledge Syllabus 2026 - Grade A (Engineering, Law & Management Posts)

Grade A covers nine disciplines: Chemical, Electrical, Instrumentation, Mechanical, Electronics and Communication Engineering, Civil Engineering, Computer Science and Information Technology, Law, and MBA (Marketing Management).

1. IOCL Chemical Engineering Syllabus (Grade A)

• Engineering Mathematics
• Process Calculation & Thermodynamics
• Fluid Mechanics & Mechanical Operations
• Chemical Reaction Engineering
• Instrumentation & Process Control
• Plant Design and Economics
• Heat Transfer
• Mass Transfer
• Chemical Technology

2. IOCL Electrical Engineering Syllabus (Grade A)

• Engineering Mathematics
• Electrical Machines
• Power Systems
• Control Systems
• Electric Circuits
• Electromagnetic Fields
• Signals and Systems
• Electrical and Electronic Measurements
• Analog and Digital Electronics
• Power Electronics

3. IOCL Instrumentation Syllabus (Grade A)

• Engineering Mathematics
• Control Systems
• Analog Electronics
• Digital Electronics
• Electricity and Magnetism
• Electrical Circuits and Machines
• Signals and Systems
• Measurements
• Sensors and Industrial Instrumentation
• Communication and Optical Instrumentation

4. IOCL Mechanical Engineering Syllabus (Grade A)

• Engineering Mathematics
• Engineering Mechanics
• Mechanics of Materials
• Theory of Machines, Vibrations & Machine Design
• Fluid Mechanics
• Heat Transfer, Thermodynamics & Power Engineering
• Fluid Mechanics and Thermal Sciences
• Materials, Manufacturing and Industrial Engineering

5. IOCL Electronics and Communication Engineering Syllabus (Grade A)

• Engineering Mathematics
• Networks, Signals and Systems
• Electronic Devices
• Analog Circuits
• Digital Circuits
• Control Systems
• Communications
• Electromagnetics

6. IOCL Civil Engineering Syllabus (Grade A)

• Engineering Mathematics
• Structural Engineering
• Geotechnical Engineering
• Water Resources Engineering
• Environmental Engineering
• Transportation Engineering
• Geomatics Engineering

7. IOCL Computer Science and Information Technology Syllabus (Grade A)

• Engineering Mathematics
• Digital Logic
• Computer Organization and Architecture
• Programming and Data Structures
• Algorithms
• Theory of Computation
• Compiler Design
• Operating System
• Databases
• Computer Networks

8. IOCL Law Syllabus (Grade A)

Substantive laws (including rules framed thereunder, if any):

Procedural laws - major statutes:

Minor procedural laws:

As per the official syllabus, the Law test will not be based only on theoretical knowledge but also on practical domain knowledge from the syllabus above.

9. IOCL MBA (Marketing Management) Syllabus (Grade A)

• Introduction to Marketing - Concepts and Approaches: market, marketing, customer needs/wants/demands, marketing orientations, holistic marketing, marketing mix, recent trends in marketing
• Developing Marketing Strategy: business portfolio strategies, marketing strategy, Porter generic strategies, value chain analysis, SWOT analysis, marketing plan, marketing control, Go-to-Market (GTM) strategies, customer acquisition and retention strategies, rural marketing strategies, B2B and B2C marketing approaches
• Marketing Information and Forecasting: analyzing marketing environment, marketing information system, demand forecasting, estimating current and future demand
• Marketing Research: process of marketing research, research instruments, sampling plan, measuring marketing productivity
• Consumer Behaviour and Industrial Markets: factors influencing consumer behaviour, consumers' buying decision process and behaviour, buyer decision process in new products, theories of consumer behaviour, business buyer behaviour and model, industrial and institutional buying behaviour, key account management, buying behaviour in energy and fuel markets
• Segmentation, Targeting and Positioning: market segmentation, market targeting, differentiation and positioning
• Product Decisions: product levels, product classification and decisions, new product development, product adoption process, product life cycle
• Pricing Decisions: pricing strategies, new product pricing strategies, product mix pricing strategies, price-adjustment strategies, price changes, public policy and pricing, pricing during PLC
• Services Marketing: types of service marketing, managing service marketing, gap analysis, SERVQUAL model, customer experience management, service recovery strategies
• Distribution Decisions: channel management and conflict, channel integration and systems, logistics management (including international), supply chain management, retail management and decisions, recent trends in retail in India, wholesaling and wholesale marketing decisions
• Promotion Decisions: integrated marketing communications (IMC), marketing communication process, promotion budget and mix strategies, advertising management, sales promotion, publicity, personal selling, direct marketing, trade promotion and dealer engagement programs, loyalty programs and customer engagement, sales force management, integrated digital campaigns
• Brand Management: brand equity models and elements, designing brand strategy, brand portfolios, managing brand equity, corporate branding, brand extension strategies, premium and branded product positioning, customer perception and brand experience
• Marketing Ethics: product, price, place and promotion related ethics, consumer protection
• Managing Marketing Organization and Control: organizing marketing department, marketing implementation and control
• Digital Marketing: digital marketing, social media marketing, SEM and SEO, mobile marketing, marketing analytics and performance metrics, digital customer journey mapping
• Social and Not-for-Profit Marketing: socially responsible behaviour, cause-related marketing, sustainable marketing, marketing and environmental concerns, social marketing, not-for-profit marketing
• Customer Value and Customer Relationship Management: customer value, lifetime value, profitability, loyalty, satisfaction, CRM, database marketing, customer acquisition cost (CAC), retention metrics, loyalty management programs, data analytics for customer insights
• International Marketing: international marketing decisions, types of global firms
• Competition Analysis: analyzing competition, competitive marketing strategies and positions, balancing customer and competitor orientations, competitive intelligence, market share analysis, benchmarking of retail networks, differentiation strategies in commodity markets
• Retail and Channel Management: retail business models, retail site selection and network planning, forecourt retailing concepts, category management, convenience retailing, visual merchandising, retail performance metrics
• Sales and Territory Management: sales forecasting, sales force effectiveness, territory planning, KPIs, relationship management with dealers/distributors
• Non-Fuel Retail (NFR) Marketing: NFR business models, convenience store marketing, partnerships and alliances, customer footfall monetization, cross-selling and up-selling strategies
• Logos and Taglines
• Strategic Management - Concept and Types: levels, forms and process of strategy
• External Analysis: PESTEL framework, ETOP, QUEST, Porter's 5 Forces, impact matrix, strategic group mapping
• Internal Analysis: competitive advantage, critical success factors, value chain analysis, benchmarking, SWOT analysis, SFAS matrix, strategic advantage profile (SAP)
• Business Strategies: generic competitive strategies, first mover advantages, cooperative strategies, industry life cycle
• Corporate Strategies: growth, stability, retrenchment and combination strategy, turnaround management
• Business Portfolio Analysis: BCG matrix, IE matrix, GE McKinsey matrix, experience curve, grand strategy matrix, SPACE matrix
• Strategy Implementation and Evaluation: strategy implementation and structure, strategy evaluation and control, control mechanisms, strategic incentive management, McKinsey's 7S model
• Management of Strategic Change: barriers to change, models of strategic change, change requirements

How to Prepare for the IOCL Exam 2026

• Start with the General Aptitude syllabus (Verbal Ability, Quantitative Aptitude, Logical Reasoning) since it is common to every post and can be prepared alongside your domain subjects.
• Map the domain knowledge syllabus for your specific post against your diploma/degree coursework, and prioritise topics you are least familiar with first.
• For technical posts (Grade E0 and Grade A engineering disciplines), revise core subjects like Circuit Theory, Machines, Thermodynamics, and Control Systems using standard diploma/GATE-level reference books, since the topic names closely mirror standard engineering curricula.
• For the Law post, focus on the Constitution (Articles 32 and 226), Contract Act, and the newer codes (Bharatiya Nagarik Suraksha Sanhita and Bharatiya Sakshya Adhiniyam, both 2023) since these replace earlier procedural laws and are likely to be tested on recent amendments.
• For MBA (Marketing Management), pay attention to IOCL-specific applications called out in the syllabus, such as "Buying Behaviour in Energy and Fuel Markets," "Forecourt Retailing Concepts," and "Non-Fuel Retail (NFR) Marketing," since these are unique to the oil-marketing business rather than generic MBA topics.
• Since the official exam pattern has not been released with this syllabus, keep checking the official notification for updates on question count, marks, and duration before finalising a revision timetable.

IOCL Syllabus 2026 - Important Links

• Click to Check General Aptitude Syllabus (All Posts) PDF
• Click to Check Domain Knowledge Syllabus - Grade A Posts PDF
• Click to Check Domain Knowledge Syllabus - Grade A0 Post PDF
• Click to Check Domain Knowledge Syllabus - Grade E0 Posts PDF
• IOCL Official Notification / Latest Job Openings: https://iocl.com/