RRB JE EC Syllabus 2026: CBT 1 and CBT 2 Technical Topics
The RRB JE EC syllabus has two layers. CBT 1 tests general subjects that every Junior Engineer applicant faces, while CBT 2 adds common sections and a 100-mark Technical Abilities paper based on Electronics and Communication. This page lists what to study in each stage for CEN 04/2026 and where to begin.
The RRBs name the test sections in the notification but do not publish a detailed topic-wise syllabus for the technical paper. The topic lists below are built from the official notification, the Electronics and Communication diploma and degree curriculum, and questions asked in earlier cycles. Use them as a working checklist, not as an official list.
Table of Contents
Syllabus at a glance
Key changes to know
CBT 1 syllabus
CBT 2 common sections
CBT 2 Technical Abilities for Electronics and Communication
Overlap between stages
How to cover the syllabus
Syllabus at a Glance
Stage | Section | Questions | Marks | Time |
|---|---|---|---|---|
CBT 1 | Mathematics | 30 | 30 | 90 minutes (total) |
CBT 1 | General Intelligence and Reasoning | 25 | 25 | - |
CBT 1 | General Awareness | 15 | 15 | - |
CBT 1 | General Science | 30 | 30 | - |
CBT 2 | General Awareness | 15 | 15 | 120 minutes (total) |
CBT 2 | Physics and Chemistry | 15 | 15 | - |
CBT 2 | Basics of Computers and Applications | 10 | 10 | - |
CBT 2 | Basics of Environment and Pollution Control | 10 | 10 | - |
CBT 2 | Technical Abilities | 100 | 100 | - |
Key Changes to Know
Two stages only: CBT 1 is a qualifier and CBT 2 decides merit. Older pages may still show a different stage count, so follow the official notification.
Technical paper is discipline-based: the 100 marks of Technical Abilities come from your own branch, not from a common engineering paper.
Topic lists differ across websites: some include extra subjects such as network theory or control systems. Prioritise the core list below first, then widen with previous-year questions.
CBT 1 Syllabus
Section | Topics to cover | Start with |
|---|---|---|
Mathematics | Number system, BODMAS, decimals and fractions, percentage, ratio and proportion, time and work, time and distance, simple and compound interest, profit and loss, algebra, geometry, trigonometry, mensuration, statistics | Percentage, ratio and time-work, which feed many other topics |
General Intelligence and Reasoning | Analogies, number and alphabet series, coding-decoding, relationships, syllogism, Venn diagrams, direction sense, classification, data sufficiency, non-verbal reasoning | Series and coding-decoding |
General Awareness | Current affairs, science and technology, sports, culture, Indian polity and economy, environmental issues | The last six months of current affairs |
General Science | Physics, chemistry and life science up to Class 10 level | Class 9 and 10 science textbooks |
Mathematics and General Science carry 60 of the 100 marks, so they deserve the largest share of your CBT 1 time.
CBT 2 Common Sections
General Awareness and Physics and Chemistry
General Awareness repeats the CBT 1 areas with more weight on current events. Physics and Chemistry is based on higher-secondary concepts: units, motion, heat, waves, optics, electricity and magnetism in physics, and atomic structure, bonding, the periodic table and reactions in chemistry.
Basics of Computers and Applications
Computer fundamentals, hardware and software, operating systems, MS Office, internet and networking basics, and common computer terms.
Basics of Environment and Pollution Control
Ecosystems, air, water, soil and noise pollution, waste management, global warming, ozone depletion and pollution-control measures.
CBT 2 Technical Abilities for Electronics and Communication
Technical Abilities is worth 100 marks, so it is the section to prepare most deeply. The table groups the topics most often followed for this discipline.
Subject area | Topics to cover | Start with |
|---|---|---|
Electronic components and materials | Conductors, semiconductors, insulators, magnetic materials, cables and optical fibre jointing, cells and batteries, relays, switches, MCBs, connectors | Semiconductor basics |
Electronic devices and circuits | PN junction diodes, thyristors, transistors, amplifiers, oscillators, multivibrators, rectifiers, inverters and UPS | Diodes and rectifiers |
Digital electronics | Number systems, Boolean algebra, logic gates, combinational and sequential circuits, counters, A/D and D/A converters, memories | Gates and Boolean algebra |
Linear integrated circuits | Operational amplifiers and their applications, voltage regulators, timers, phase-locked loops | Op-amp configurations |
Microprocessors and microcontrollers | 8085 architecture, instruction set, assembly programming, peripherals, microcontroller basics | 8085 architecture |
Electronic measurements | Measurement principles, range extension, CRO, LED and LCD panels, transducers | CRO and transducers |
Communication engineering | Modulation, multiplexing, wave propagation, transmission lines, optical fibre, public address, exchanges, radar, cellular and satellite communication | Analog modulation |
Data communication and networks | Data communication basics, interfaces, networking devices, LAN and WAN, internetworking | Network models and devices |
Computer programming | C and C++ fundamentals, operators, control statements, functions, arrays, strings, pointers, data structures, DBMS basics | C control statements and arrays |
Basic electrical engineering | DC and AC circuits, effects of electric current, magnetic circuits, earthing | Ohm's law and AC fundamentals |
Digital electronics, devices and circuits and communication usually supply the largest groups of questions, so finish those before the smaller areas.
Overlap Between Stages
Area | CBT 1 | CBT 2 | How to plan |
|---|---|---|---|
General science | Class 10 level, 30 marks | Physics and Chemistry, 15 marks, higher level | Study once from Class 9 to 12 and revise in both stages |
General awareness | 15 marks | 15 marks | Maintain one set of monthly current-affairs notes |
Computers and electricity | Basic science questions | Computer basics and basic electrical engineering | Treat basic electrical topics as technical marks, not extra work |
How to Cover the Syllabus
Weeks 1 to 6: complete core technical subjects (devices, digital electronics, communication) and CBT 1 arithmetic.
Weeks 4 to 8: add reasoning practice, Class 9 to 12 science and 30 minutes of current affairs every day.
Weeks 7 to 10: cover the remaining technical areas, computers and environment, and start topic-wise tests.
Final phase: take full-length tests, analyse them the same day and revise your error log.
The official notification on the RRB website remains the final reference.
Frequently Asked Questions
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