IOCL Junior Engineer Syllabus & Exam Pattern 2026: Get Complete Details

Indian Oil Corporation Limited (IOCL) has published the IOCL Junior Engineer Syllabus along with the detailed notification for 2026. Aspiring candidates looking to secure a position as a Junior Engineer (JE) within this prestigious organization must understand the syllabus and test structure thoroughly. To explore more about ongoing opportunities, you can check IOCL Recruitment 2026.

Additionally, candidates interested in other profiles can explore the IOCL Marketing Officer Syllabus and Exam Pattern 2026- Click to Check and the IOCL Law Officer Syllabus and Exam Pattern 2026 – Click to Check.

IOCL Junior Engineer Selection Process 2026

The selection process for the Junior Engineer post includes multiple stages designed to assess technical competency, aptitude, and overall suitability. The stages consist of a Computer-Based Test, Group Discussion (GD) & Group Task (GT), Personal Interview, Document Verification, and a Medical Examination. Notably, the weightage of the computer-based exam accounts for 80% in the overall selection.

Overview of IOCL Junior Engineer Exam Pattern

The IOCL Junior Engineer Exam is a Computer-Based Test consisting of objective-type multiple-choice questions. Below is a quick overview of the exam parameters:

Section-Wise Distribution

Marking Scheme and Qualifying Marks

Candidates are awarded +1 mark for every correct answer, while -0.25 marks are deducted for incorrect answers. To qualify for the next stage, candidates must achieve the category-specific minimum standards:

• General/EWS/OBC-NCL: 40% in each section and 45% overall.
• SC/ST: 35% in each section AND 40% overall.
• PwBD: 25% in each section AND 30% overall.

IOCL Junior Engineer Exam Subjects Checklist

The main testing areas include:

• Discipline-specific (Chemical/Mechanical/Electrical/Instrumentation)
• Quantitative Aptitude
• Logical Reasoning
• Verbal Ability (English Language)

Detailed Syllabus by Discipline

Syllabus for Junior Engineer (Electrical)

• 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

Syllabus for Junior Engineer (Instrumentation)

• Electronic Devices and Circuits
• Electrical Circuits and Machines
• Basics of Instrumentation
• Analogue and Digital Electronics
• Measurements and Instruments
• Measurement of Process Variables
• Industrial Instrumentation
• Process Control Instrumentation
• Control Engineering
• Instrumentation System Design
• Programmable Logic Controllers

Syllabus for Junior Engineer (Mechanical)

• 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 Systems

Syllabus for Junior Engineer (Chemical)

• Chemical Engineering Fundamentals: Basic Principles (Stoichiometry) of Chemical Engineering, Chemical Thermodynamics, Fluid Mechanics and Mechanical Operations, Heat Transfer, Mass Transfer, Chemical Reaction Engineering, Process Control and Instrumentation
• Petroleum Refining Processes: Crude Oil properties and refining objectives, Distillation Processes (atmospheric and vacuum distillation), Catalytic reforming and Isomerisation, Fluid catalytic cracking (FCC), Hydrocracking and hydrotreating, Alkylation, Isomerisation, Refinery utilities (cooling water systems, steam systems, etc.)
• Petrochemical Processes: Basics of Petrochemicals, Steam cracking and ethylene production, Polymerisation processes (Polypropylene, polyethene), Aromatics production (Benzene, Toluene, Xylene), Olefins and derivatives (propylene, butadiene, etc.), Production of various petrochemical intermediates
• Process Equipment and Operations: Operation and control of Pump Houses, Fired Heaters: Types and operations, Compressors: Types and operations, Distillation Columns: Tray and packed columns, operations, Reactors: Types and operations, Heat Exchangers: types, operations, and maintenance
• Safety and Environment: Process Safety Management, Job Safety Analysis (JSA), HAZOP, Hazard Identification and Risk Assessment, Safety in handling hazardous materials, Environmental regulations and considerations in a refinery/petrochemical plant

Official Documentation & Downloads

You can reference and download the complete syllabus details directly through the official file link: IOCL JE Syllabus 2026 Official PDF- Click to Download.

Frequently Asked Questions (FAQs)

How many section will be there in the IOCL JE Exam 2026?

There will be 2 section in the IOCL JE Exam 2026, i.e., Domain Knowledge and General Aptitude.

Is there any Negative Marking in the IOCL Junior Engineer Exam?

Yes, there will be a negative marking of 0.25 mark for each incorrect answer in the IOCL Junior Engineer Exam 2026.

What is the weightage of the computer-based test in the final selection?

The weightage of the computer-based exam is 80% in the overall selection process.

What is the total duration of the exam?

The duration of the exam is 150 minutes (2 hours 30 minutes).