Chennai Petroleum Corporation Limited (CPCL) has officially published the comprehensive technical syllabus for Advt. No. 01 of 2026 for Junior Engineering Assistant-IV posts in Production, Mechanical, Electrical, and Instrumentation disciplines.
The Computer Based Test (CBT) carries 120 questions for 120 marks (50 General Aptitude + 70 Technical Discipline questions) with a 2-hour duration and 1/4th negative marking.
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CPCL JEA Exam Pattern 2026
Check 120 marks CBT scheme, 1/4th penalty calculation & SPPT rules.
1. CPCL JEA Syllabus 2026 – Quick Overview
| Organization | Chennai Petroleum Corporation Limited (CPCL / IOCL Group) |
|---|---|
| Post Name | Junior Engineering Assistant-IV (Grade IV) |
| Advertisement No. | Advt. No. 01 of 2026 – CPCL/HRD:03:055 |
| Exam Mode | Computer Based Test (CBT) – Objective MCQs |
| Total Questions & Marks | 120 Questions | 120 Marks |
| Exam Duration | 2 Hours (120 Minutes) |
| Part A Weightage | General Aptitude (50 Questions / 50 Marks) |
| Part B Weightage | Discipline Technical Knowledge (70 Questions / 70 Marks) |
| Negative Marking | 1/4th (0.25) mark for every wrong answer |
| Exam Centre | Chennai Only (Tentatively Sept/Oct 2026) |
| Skill/Proficiency Test (SPPT) | Qualifying in nature (1:3 Shortlisting Ratio) |
| Official Syllabus PDF | Download 7-Page Official PDF |
2. CPCL JEA Exam Pattern 2026
The CBT question paper is divided into two distinct sections:
| Section | Subject / Topic Area | Questions | Marks | Duration |
|---|---|---|---|---|
| Part A | General Aptitude (Verbal Ability, General Knowledge, Reasoning & Numerical Ability) | 50 | 50 | 2 Hours (120 Minutes) |
| Part B | Discipline Technical Knowledge (Production, Mechanical, Electrical, or Instrumentation) | 70 | 70 | |
| Total CBT Paper | 120 Qs | 120 Marks | ||
3. Part A: General Aptitude Syllabus (50 Marks)
The General Aptitude section is common to all four engineering streams and carries 50 marks across four core sub-sections:
- English Grammar & Parts of Speech
- Vocabulary, Synonyms & Antonyms
- Sentence Correction & Error Spotting
- Fill in the Blanks & Sentence Completion
- Reading Comprehension Passages
- Idioms, Phrases & Correct Usage of Words
- Active & Passive Voice, Direct/Indirect Speech
- Indian History & Freedom Movement
- Indian & World Geography
- Indian Polity & Constitution of India
- Indian Economy, Banking & Hydrocarbon Sector
- General Science & Basic Applied Technology
- Environmental Science & Ecology
- National & International Current Affairs (Last 6 Months)
- Sports, Awards, Honours & Important Days
- Analogies & Classifications
- Number & Alphabet Series
- Coding-Decoding & Blood Relations
- Direction Sense Test & Seating Arrangement
- Syllogisms, Statement & Conclusion
- Logical Deductions & Venn Diagrams
- Puzzles & Data Sufficiency
- Number System, Simplification & BODMAS
- Decimals, Fractions, HCF & LCM
- Percentage, Ratio & Proportion
- Averages, Profit & Loss, Discount
- Simple Interest & Compound Interest
- Time & Work, Pipes & Cisterns
- Speed, Time & Distance, Trains, Boats
- Basic Algebra, Mensuration (2D & 3D) & Data Interpretation
4. Part B: Production Discipline Syllabus (15 Units)
Based on the official CPCL syllabus PDF, candidates for CPCL01 (Production) must prepare the following 15 comprehensive technical modules:
Nomenclature & Reaction Intermediates of Organic Compounds, Surface Chemistry, Chemical Thermodynamics, Material Science, Engineering Materials.
Strength of Materials, Mechanical Systems & Friction, Basics of Thermodynamics & Refrigeration, Steam Boilers, Steam Turbines, IC Engines, Fuels, Nanotechnology, Robotics.
Basics of Electric Current, AC Circuits, Electrostatics & Electromagnetism, DC Machines, AC Machines, Transformers, Basic Electronics.
Size Reduction & Conveying, Solid-Solid Separation, Solid-Gas Separation, Solid-Liquid Separation, Special Separation Methods, Mixing & Agitation.
Fluid Statics, Fundamentals of Fluid Dynamics, Flow of Incompressible Fluids in Pipes, Transportation of Liquids (Pumps), Transportation of Gases (Compressors, Blowers), Piping & Valves.
Water Treatment, Alkalies & Industrial Gases, Fertilizers (Urea, Ammonia, Phosphatic), Glass, Cement, Paint, Mineral Acid Industries (Sulphuric, Nitric, Phosphoric).
Conduction (Fourier's Law), Convection (Natural & Forced), Radiation (Stefan-Boltzmann), Heat Exchangers (Shell & Tube, Plate Type), Evaporation, Multiple Effect Evaporators, Thermal Insulation.
Fundamentals of Process Calculations, Material Balance Without Chemical Reaction, Material Balance with Chemical Reaction (Yield, Selectivity, Limiting Reactant), Energy Balance, Chemical Kinetics.
Measurement Fundamentals, Temperature Measurement (RTD, Thermocouples), Pressure Measurement, Flow, Liquid Level & Humidity Measurement, Process Control Loops, Computerized Process Control (DCS/SCADA).
Oils, Fats & Detergents, Petroleum Processing (Crude Distillation, FCCU, Hydrocracking, Catalytic Reforming), Petrochemical Technology (Olefins, Aromatics), Polymer Processing, Biotechnology & Fermentation.
Industrial Accidents & Safety Protocols, Fire & Explosion Hazards, Process Plant Risk Assessment, Legal Aspects of Safety (Factories Act), Air/Water/Solid Pollution Control (ETP, Flares).
Principles of Diffusion & Mass Transfer, Fundamentals of Distillation, Design & Techniques of Distillation Columns (Tray & Packed), Gas Absorption, Solvent Extraction.
Humidification & Dehumidification, Industrial Drying Equipment, Crystallisation, Solid-Liquid Leaching, Membrane Separations.
Paper & Sugar Technology, Pharmaceutical & Genetic Engineering, Surface Coating Industries, Pesticides & Dyes, Food Processing & Applied Nanotechnology.
Plant Utilities (Steam, Cooling Water, Plant Air, Nitrogen), Storage & Handling of Hazardous Chemicals, Plant Maintenance, Energy Management, Corrosion Prevention & Control.
5. Part B: Mechanical Discipline Syllabus (18 Units)
Official syllabus breakdown for CPCL02 (Mechanical) across 18 core engineering modules:
Statics of particles & friction, Simple stresses & strains, Section properties, Thin shells, SFD & BMD, Simple bending, Torsion, Springs.
Foundry Technology, Welding (Arc, TIG, MIG, Gas), Metal Forming, Metal Cutting & Lathe Operations, Drilling, Metrology & Inspection.
Sectional views, Limits, fits & tolerances, Surface texture, Keys, Screw threads, Fasteners, Assembly & Sub-assembly drawings.
Laws of Thermodynamics, Thermodynamic processes, Air standard cycles, Fuels & Combustion, Air Compressors, Gas Turbines, Steam Boilers & Performance.
Plastic & Composite manufacturing, Reciprocating machines, Broaching, Milling, Gear generation, Abrasive grinding, Non-conventional machining (EDM, ECM), CNC programming.
Fluid properties, Pressure measurement, Flow through pipes, Impact of jets, Hydraulic turbines (Pelton, Francis, Kaplan), Centrifugal & Reciprocating pumps, Pneumatic & Hydraulic circuits.
DC & AC circuits, DC & AC machines, Stepper & Servo motors, Industrial drives, Logic gates, Control elements, PLC basics.
Design of joints & fasteners, Shafts, Couplings, Keys, Belts (Flat & V), Bearings (Journal & Rolling), Levers, Spur gears.
Thermal power plants, Steam turbines, Condensers, IC Engines, Automobile transmission, Power trains, Brakes, Automobile electricals, Emission control.
Process planning & selection, Work study, Cost estimation, Machining time calculations.
TQM principles, Continuous improvement (Kaizen), 7 QC tools, Control charts, Management planning tools, Benchmarking.
Press operations & machinery, Cutting dies, Bending & forming dies, Drawing dies, Fine blanking.
Solar, Wind, Bio-energy, Ocean/Tidal energy, Energy storage, Energy audit & Conservation techniques.
Plant engineering & safety, Method study, Work measurement, PPC, Quality control, Materials management.
Computer Aided Design & Manufacturing, CNC programming, Rapid prototyping, CIM, FMS, AGV, Robotics in manufacturing.
Measurement types & errors, Displacement, Pressure, Temperature, Flow measurements, Industrial control systems.
Robot technology, Controllers, Drive systems, End effectors, Sensors, Machine vision, Kinematics, Robot programming.
Vapour compression & absorption systems, Cryogenics, Refrigerants, Psychrometrics, Cooling load calculations, Duct design.
6. Part B: Electrical Discipline Syllabus (16 Units)
Official syllabus breakdown for CPCL03 (Electrical) across 16 core electrical modules:
DC circuits, Electrostatics, Circuit theorems (Thevenin, Norton, Superposition, Maximum Power), Single-phase AC, Resonance, 3-Phase circuits.
DC generators (EMF equation, characteristics), DC motors (Speed control, starters), 1-Phase & 3-Phase Transformers, Storage batteries.
Semiconductors, Diodes, BJT, Oscillators, FET, UJT, SCR, DIAC, TRIAC, MOSFET, Optoelectronics, Wave shaping circuits.
Alternators (Construction, regulation, synchronization), 3-Phase & 1-Phase Induction Motors, Synchronous Motors, Special AC/DC machines.
Instrument classification & characteristics, Voltage, Current, Resistance measurement, Power & Energy meters, Power factor, Frequency meters, Bridges & Waveform analysis.
Number systems, Boolean algebra, Logic gates, Combinational & Sequential logic, Memory devices, 8085 Microprocessor architecture.
Passive & Active transducers, LVDT, RTD, Strain gauges, Operational amplifiers, Signal conditioning circuits.
Power generation, AC & HVDC transmission, Underground cables, Line insulators, Circuit breakers (SF6, Vacuum, Air Blast), Protective relays, Substation grounding.
8051 Architecture, Instruction set, Assembly programming, I/O ports, Timers, Interrupts, Serial communication, Interfacing.
Internal wiring & earthing estimates, Domestic & Industrial load calculation, Energy management, Energy audit of motors, Lighting & DG sets.
Control circuit components, AC motor control circuits, Industrial starter circuits, PLC fundamentals.
PLC architecture, I/O modules, Ladder logic programming, Timers/Counters, Industrial networking & SCADA interfacing.
Design considerations, Magnetic circuit calculations, Core/Winding design of Transformers, DC machines & AC machines.
Distribution systems, Industrial drives, Electric traction, Illumination design, Electric heating & Welding.
Safety rules (IE Rules), Earthing maintenance, Transformer oil testing & maintenance, Generator overhauling, Substation maintenance.
Line & Forced commutated converters, Inverters, Choppers, Dual converters, Variable Frequency Drives (VFD) for AC motor control.
7. Part B: Instrumentation Discipline Syllabus (17 Units)
Official syllabus breakdown for CPCL04 (Instrumentation) across 17 core automation & measurement modules:
Semiconductor devices, Diodes, BJT, FET, MOSFET, SCR, Optoelectronic devices, Wave-shaping circuits.
Network theorems, AC circuits, Resonance, 3-Phase AC, DC machines, AC machines, Transformers.
Measurement fundamentals, Performance characteristics (Static & Dynamic), Mechanical, Optical & Electrical transducers.
Linear ICs, Operational amplifiers, 555 Timers, Combinational & Sequential logic, D/A & A/D converters, Semiconductor memories.
Bridges (Wheatstone, Maxwell, Schering), CRO, DSO, Digital multimeters, Spectrum analyzers, Op-amp test circuits.
Temperature (RTD, Thermocouples, Pyrometers), Pressure (Bourdon, Diaphragm, Piezoelectric), Flow (Orifice, Venturi, Magnetic, Ultrasonic), Level & Moisture measurement.
Velocity, Acceleration, Force, Torque & Shaft power measurement, pH meters, Conductivity meters, Gas Chromatography, Mass Spectrometry.
P, PI, PID control actions, Controller tuning (Ziegler-Nichols), Final control elements (Control valves, Actuators, Positioners), Cascade & Ratio control.
8051 Architecture, Programming, I/O interfacing, Timers, Interrupts, Serial communication.
Transfer functions, Block diagram algebra, Signal flow graphs, Time response analysis, Frequency response (Bode plot, Nyquist, Root locus), Stability criteria.
Transmitter design (4-20 mA current loops), Signal conditioning, Control valve sizing, SIL ratings & Safety Instrumented Systems (SIS).
PLC hardware architecture, Ladder programming, Timers/Counters, Advanced mathematical instructions, Industrial communication buses.
Power semiconductors, Converters, Inverters, Cycloconverters, Industrial speed control.
Automated testing, V-I signature analysis, Boundary scan testing, ATE test program generation.
Distributed Control Systems (DCS architecture), SCADA systems, Fieldbus protocols, Industrial robotics & drives.
Robot configurations, Controllers, Servo systems, Vision systems, Kinematics, Robot programming.
ARM processor architecture, LPC2148, RTOS concepts, Embedded C programming.
8. Discipline-wise High-Priority Preparation Topics
While CPCL does not specify individual topic weightages, the following core operational modules carry high practical relevance in refinery operations:
⚗️ Production Engineering Priority:
⚙️ Mechanical Engineering Priority:
⚡ Electrical Engineering Priority:
🔬 Instrumentation Engineering Priority:
9. CPCL CBT Preparation Strategy & SPPT Guide
- Balance Aptitude & Discipline: Allocate 60% of your daily study time to technical engineering topics (70 Marks) and 40% to General Aptitude (50 Marks).
- Formula & Concept Revision Notes: Prepare concise handwritten formula sheets for thermodynamics, fluid flow, circuits, and process calculations.
- Practice with Negative Marking: Because of the 1/4th penalty, solve MCQs under timed conditions (120 questions in 120 minutes) and avoid blind guesswork.
- Regular Mock Tests: Take full-length sectional and complete CBT mock tests to improve speed and question selection.
- Prepare for Qualifying SPPT: Remember that candidates scoring above the CBT cutoff are shortlisted in a 1:3 ratio for the Skill, Proficiency and/or Physical Test (SPPT), which is qualifying in nature.
10. Download Official CPCL Syllabus PDF & Links
| Official Portal Link / Document | Action Link |
|---|---|
| Official CPCL JEA Detailed Syllabus PDF (7-Page PDF) | Download Syllabus PDF |
| CPCL JEA Exam Pattern 2026 (CBT Marking, Duration & SPPT Scheme) | View Exam Pattern |
| CPCL Recruitment 2026 Full Notification & Eligibility Details | View Recruitment Details |
| Online Application Direct Registration Link | Apply Online |
| Official Online Application Instructions | Read Instructions |
| Pre-Employment Medical Examination Guidelines PDF | Medical Guidelines PDF |