IOCL Junior Engineer Syllabus and Exam Pattern 2026, Official Syllabus PDF

Indian Oil Corporation Limited (IOCL) has published the IOCL Junior Engineer Syllabus along with the detailed notification. Candidates applying for the Computer-Based Test for the Junior Engineer position should be familiar with the syllabus and exam pattern. Having a clear grasp of the subject-specific syllabus and the exam format enables candidates to plan their preparation systematically and concentrate on key topics.

IOCL Junior Engineer Syllabus and Exam Pattern 2026

The candidates who will be applying for the IOCL Recruitment 2026 have to go through a multiple-stage selection process that includes a Computer-Based Test, Group Discussion (GD) & Group Task (GT), Personal Interview, Document Verification, and a Medical Examination. The weightage of the computer-based exam will be 80% in the overall selection. So, candidates must appear well prepared for the exam, for which knowing the detailed syllabus is important.

IOCL Junior Engineer Exam Pattern 2026

The IOCL Junior Engineer Exam 2026 will be a computer-based test and will include 2 sections, i.e., Domain Knowledge and General Aptitude. There will be a total of 150 objective-type multiple-choice questions, and each question will carry 1 mark, making a total of 150 marks. There will be a negative marking of 0.25 marks for each incorrect answer. Candidates will be given a time duration of 150 minutes to complete their exam.

Qualifying Marks:

(i) General/EWS/OBC-NCL- 40% in each section and 45% overall
(ii) SC/ST- 35% in each section AND 40% overall
(iii) PwBD- 25% in each section AND 30% overall

IOCL Junior Engineer Syllabus 2026

Each discipline covers core technical concepts such as electrical machines, control systems, fluid mechanics, thermodynamics, process equipment, instrumentation systems, and safety measures in industries.

Candidates should ensure that they cover every unit thoroughly, as the questions are framed directly from the prescribed syllabus.

Syllabus for Junior Engineer (Electrical)

1. Introduction to Electric Generation Systems
2. Electrical Circuit Theory
3. Electrical Machines
4. Electronic Devices and Circuits
5. Power Electronics
6. Electrical and Electronic Measurements
7. Digital Electronics
8. Transducers and Signal Conditioners
9. Electric Power Transmission and Distribution
10. Microcontroller, Programmable Logic Controller and Microprocessor
11. Electrical estimation, Energy Auditing and Energy Conservation
12. Electrical Properties of Materials
13. Electrical Machine Controller
14. Control Systems – Analysis and modelling
15. Signals and Systems
16. Illumination practices
17. Building Electrification
18. Renewable Energy Power Plant

Syllabus for Junior Engineer (Instrumentation)

1. Electronic Devices and Circuits
2. Electrical Circuits and Machines
3. Basics of Instrumentation
4. Analogue and Digital Electronics
5. Measurements and Instruments
6. Measurement of Process Variables
7. Industrial Instrumentation
8. Process Control Instrumentation
9. Control Engineering
10. Instrumentation System Design
11. Programmable Logic Controllers

Syllabus for Junior Engineer (Mechanical)

1. Basic Mechanical Engineering
2. Computer-Aided Machine Drawing
3. Material Science and Engineering
4. Fluid Mechanics and Hydraulic Machinery
5. Manufacturing Engineering
6. Thermal Engineering
7. Measurements & Metrology
8. Strength of Materials
9. Advanced Manufacturing Processes
10. Theory of Machines & Mechanisms
11. Industrial Engineering & Management
12. Design of Machine Elements
13. Production and Operations Management
14. Pneumatic Tools and Systems

Syllabus for Junior Engineer (Chemical)

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

IOCL JE Syllabus Official PDF

The Indian Oil Corporation Limited (IOCL) has released the IOCL JE Syllabus PDF on its official website www.iocl.com. Candidates can check the syllabus from this article, or they can also use the direct link provided below to download the IOCL Junior Engineer Syllabus 2026 Official PDF.

IOCL JE Syllabus 2026 Official PDF- Click to Download