BEL Probationary Engineer Syllabus 2026 - Check Exam Pattern

BEL Probationary Engineer Syllabus 2026 - Check Exam Pattern

Overview

• Conducting Body: Bharat Electronics Limited (BEL).
• Post: Probationary Engineer.
• Advt. No.: 17556/HR/All-India/2026.
• Vacancies: 350.
• Selection: Computer-Based Test (CBT) followed by Interview.
• Exam Mode: Online.
• Question Type: Multiple Choice Questions (MCQ).
• Official Source (Notification PDF): https://bel-india.in/wp-content/uploads/2026/10/External-Ad-2026-English-1.pdf

Exam Pattern

• Negative Marking: 0.25 mark deducted for each wrong answer.
• Paper Language: English.
• Part II (technical) carries 100 of 125 marks.
• Both parts share one combined duration of 2 hours, so time management across parts matters.

Selection Process

• Computer-Based Test (CBT).
• Interview.

How to Use This Study Aid

• Read the Overview, Exam Pattern and Selection Process first; they define the fixed facts of the recruitment.
• Treat the syllabus sections as a checklist: tick each sub-topic as you finish revising it.
• Use the subject-wise weightage and priority notes to decide what to revise first when time is short.
• Follow the weekly study plan as a flexible template, not a rigid instruction.
• Attempt full-length mock tests before the real exam to practise the 2-hour, 125-question rhythm.
• Return to the FAQ and Common Mistakes sections during the final week of revision.
• Always cross-check any detail against the official notification PDF on bel-india.in.

Syllabus - Part I: General Aptitude & Reasoning

A. English Language (within Part I)

• Correcting Sentences.
• Ordering, Word Usages.
• Comprehension.
• Verbs, Synonyms.
• Proposition, Sentence Formation, Tenses.

B. Quantitative Aptitude (within Part I)

• Area, Average, Boats and Streams.
• Calendar, Chain Rule, Compound Interest.
• Data Interpretation, Fraction, Height and Distance.
• Problems on Trains, Percentage, Clock.

C. General Awareness (within Part I)

• Awards, Books and Authors, Economy, Business, Sports.
• Current Events, Important Dates.
• National and International Affairs, Science & Technology.

D. Reasoning Ability (within Part I)

• Analogy, Analytical Reasoning, Arithmetic Reasoning.
• Blood Relation, Character Puzzles, Classification.
• Data Sufficiency, Direction Sense Test, Letter and Symbol Series.
• Logical Problems, Logical Sequence of Words, Seating Arrangement.
• Series Completion.

Aptitude & Reasoning - Standard Sub-Topic Breakdown

• English: sentence correction, spotting errors, fill in the blanks, cloze test, para jumbles, synonyms, antonyms, one-word substitution, idioms and phrases, active and passive voice, direct and indirect speech, tenses, subject-verb agreement, prepositions, reading comprehension.
• Quantitative Aptitude: number system, HCF and LCM, simplification, percentage, profit and loss, ratio and proportion, average, ages, time and work, time speed and distance, trains, boats and streams, simple and compound interest, mixture and alligation, mensuration of 2D and 3D shapes, permutation and combination, probability, data interpretation through tables, bar charts and pie charts.
• General Awareness: awards and honours, books and authors, Indian economy and banking, business and industry, sports events, national and international affairs, important dates and days, science and technology developments, static general knowledge.
• Reasoning Ability: analogy, classification, series (number, letter, symbol), coding and decoding, blood relations, direction sense, seating arrangement, ranking and ordering, syllogism, statement and conclusion, data sufficiency, arithmetic reasoning, analytical puzzles, input-output reasoning.

Syllabus - Part II: Concerned Discipline

The technical section covers the candidate's own engineering discipline. Based on the published syllabus references, the main discipline categories are Electronics Engineering and Mechanical Engineering, with additional topic lists provided.

Electronics Engineering Topics (Reference List)

• Engineering Mathematics.
• Network Theory.
• Electronic Devices.
• Analog Electronics.
• Digital Electronics.
• Signals and Systems.
• Control Systems.
• Communication Systems.
• Electromagnetic Theory.
• Microprocessors and Microcontrollers.
• Measurements and Instrumentation.
• Digital Signal Processing.
• Antennas and Wave Propagation.

Electronics Engineering - Detailed Sub-Topics

1. Engineering Mathematics

• Linear Algebra: matrices, rank, systems of linear equations, eigenvalues and eigenvectors.
• Calculus: limits, continuity and differentiability, mean value theorems, maxima and minima, partial derivatives, multiple integrals.
• Differential Equations: first order equations, linear higher order equations with constant coefficients.
• Complex Variables: analytic functions, Cauchy-Riemann equations, Cauchy's integral theorem and formula, residue theorem.
• Probability and Statistics: random variables, distributions, mean, median, mode, standard deviation, correlation and regression.
• Numerical Methods: solutions of equations, interpolation, numerical integration and differentiation.

2. Network Theory

• Kirchhoff's current and voltage laws, mesh analysis and nodal analysis.
• Network theorems: Thevenin, Norton, superposition, reciprocity, Tellegen, Millman and maximum power transfer.
• Transient analysis of RL, RC and RLC circuits with DC and AC excitation.
• Steady-state sinusoidal analysis, phasors, impedance and admittance.
• Resonance in series and parallel circuits, quality factor and bandwidth.
• Coupled circuits, self and mutual inductance, dot convention.
• Two-port networks: Z, Y, h and ABCD parameters and their inter-relationships.
• Laplace transform applications to circuit analysis, initial and final value theorems.
• Network functions, poles and zeros, and network graph basics.

3. Electronic Devices

• Semiconductor physics: intrinsic and extrinsic materials, drift and diffusion, mobility and conductivity.
• PN junction diode: formation, V-I characteristics, depletion region, breakdown mechanisms.
• Zener diode as regulator, rectifiers (half-wave, full-wave, bridge) and filter circuits.
• Bipolar Junction Transistor: construction, operation and configurations, biasing and stability.
• Field Effect Transistors: JFET and MOSFET characteristics, biasing and small-signal models.
• Special devices: LED, photodiode, solar cell, tunnel diode, varactor, SCR, UJT and DIAC.

4. Analog Electronics

• Diode applications: clippers, clampers, voltage multipliers and rectifier efficiency.
• BJT and MOSFET amplifiers: CE, CB, CC, CS, CG and CD configurations.
• Biasing techniques, load lines and thermal stabilisation.
• Small-signal analysis, h-parameters, gain, input and output impedance.
• Frequency response: low and high frequency analysis, Miller effect, gain-bandwidth product.
• Feedback amplifiers: positive and negative feedback, types and effects.
• Oscillators: RC, LC and crystal oscillators, Barkhausen criterion.
• Operational amplifiers: ideal and real behaviour, inverting and non-inverting amplifiers, summers, differentiators, integrators, comparators.
• Active filters, waveform generators, 555 timer and power amplifiers.
• Voltage regulators: series, shunt and switching regulators.

5. Digital Electronics

• Number systems and codes: binary, octal, hexadecimal, BCD, Gray code.
• Boolean algebra, minimisation using Karnaugh maps and tabulation method.
• Logic gates, universal gates and gate-level implementations.
• Combinational circuits: adders, subtractors, multiplexers, demultiplexers, encoders, decoders and comparators.
• Sequential circuits: latches, flip-flops, registers, counters and their design.
• Memories: ROM, RAM, PROM, EPROM, EEPROM and flash memory.
• Data converters: ADC and DAC types and their characteristics.
• Logic families: TTL, CMOS, ECL, their parameters and interfacing.
• Programmable logic devices and an introduction to HDL-based design.

6. Signals and Systems

• Signal classification: continuous and discrete, periodic and aperiodic, even and odd, energy and power signals.
• Linear Time-Invariant systems, impulse response and convolution.
• Fourier series and Fourier transform, properties and applications.
• Laplace transform, region of convergence and system analysis.
• Z-transform, region of convergence and solution of difference equations.
• Sampling theorem, aliasing and reconstruction of signals.
• Introduction to the Discrete Fourier Transform and its properties.

7. Control Systems

• Open-loop and closed-loop systems, transfer functions.
• Block diagram reduction and signal flow graphs with Mason's gain formula.
• Time response of first and second order systems, time-domain specifications.
• Steady-state error and error constants.
• Stability: Routh-Hurwitz criterion and root locus technique.
• Frequency response: Bode plots, polar plots and Nyquist stability criterion.
• Compensators and controllers: lead, lag, PID, and their design.
• State-space representation and solution of state equations.

8. Communication Systems

• Amplitude modulation and demodulation, DSB, SSB and VSB.
• Angle modulation: frequency and phase modulation, bandwidth considerations.
• Noise in analog communication, signal-to-noise ratio and noise figure.
• Pulse modulation: PAM, PWM, PPM and PCM.
• Digital modulation: ASK, FSK, PSK, QPSK and QAM.
• Information theory: entropy, channel capacity and Shannon's theorem.
• Error control coding: block codes, cyclic codes and convolutional codes.
• Multiplexing: FDM, TDM and WDM, and spread-spectrum basics.

9. Electromagnetic Theory

• Vector calculus: gradient, divergence, curl and their theorems.
• Electrostatics: Coulomb's law, Gauss's law, electric potential, capacitance and dielectrics.
• Magnetostatics: Biot-Savart law, Ampere's law, magnetic materials and inductance.
• Maxwell's equations in differential and integral form, boundary conditions.
• Electromagnetic wave propagation in free space, dielectrics and conductors.
• Transmission lines: characteristic impedance, reflection coefficient, Smith chart.
• Waveguides, resonance cavities and basics of microwave components.

10. Microprocessors and Microcontrollers

• 8085 and 8086 architecture, register organisation and pin description.
• Instruction set, addressing modes and assembly language programming.
• Memory and I/O interfacing, timing diagrams.
• Peripheral interfacing: 8255, 8251, 8259, 8253 and 8279.
• 8051 microcontroller architecture, ports, timers and serial communication.
• Interrupts, DMA and interrupt handling.

11. Measurements and Instrumentation

• Bridge circuits: Wheatstone, Kelvin, Maxwell, Hay and Schering bridges.
• Analog meters: PMMC, moving iron and dynamometer types.
• Oscilloscope: CRO block diagram, measurement of amplitude, frequency and phase.
• Digital instruments: digital multimeter, frequency counter and digital storage oscilloscope.
• Transducers: strain gauge, thermocouple, thermistor, LVDT, piezoelectric and photoelectric.
• Error analysis, accuracy, precision, resolution and calibration.

12. Digital Signal Processing

• Discrete-time signals and systems, linear convolution and correlation.
• Discrete Fourier Transform and Fast Fourier Transform algorithms.
• Z-transform and analysis of discrete-time systems.
• Design of FIR filters: windowing and frequency sampling methods.
• Design of IIR filters: impulse invariance and bilinear transformation.
• Quantisation effects, finite word length and multirate signal processing basics.
• Introduction to DSP processor architecture.

13. Antennas and Wave Propagation

• Antenna parameters: radiation pattern, gain, directivity, beam width and aperture.
• Elementary antennas: dipole, monopole and loop antennas.
• Antenna arrays: broadside and end-fire arrays, array factor.
• Practical antennas: Yagi-Uda, parabolic reflector, horn and microstrip antennas.
• Ground wave, sky wave and space wave propagation.
• Ionospheric propagation, critical frequency and skip distance.

Mechanical Engineering Topics (Reference List)

• Engineering Mathematics.
• Engineering Mechanics.
• Strength of Materials.
• Theory of Machines.
• Machine Design.
• Thermodynamics.
• Fluid Mechanics.
• Heat Transfer.
• Manufacturing Engineering.
• Production Engineering.
• Materials Science.
• Industrial Engineering.
• Refrigeration and Air Conditioning.
• IC Engines and Power Plants.
• Engineering Drawing.

Mechanical Engineering - Detailed Sub-Topics

1. Engineering Mathematics

• Linear Algebra: matrices, rank, eigenvalues and eigenvectors, systems of equations.
• Calculus: limits, continuity, differentiability, maxima and minima, multiple integrals.
• Differential Equations: first order and linear higher order equations.
• Complex Variables: analytic functions, Cauchy-Riemann equations, contour integration.
• Probability and Statistics: distributions, mean, standard deviation, correlation.
• Numerical Methods: interpolation, numerical integration and solution of equations.

2. Engineering Mechanics

• Statics: force systems, equilibrium of particles and rigid bodies.
• Trusses: method of joints and method of sections.
• Friction: laws of friction, belt friction and screw jack.
• Centroids and centres of gravity.
• Area and mass moments of inertia, parallel and perpendicular axis theorems.
• Dynamics: Newton's laws, work-energy and impulse-momentum principles.
• Kinematics and kinetics of particles and rigid bodies.

3. Strength of Materials

• Stress and strain, elastic constants and their relationships.
• Mohr's circle for stress and strain, principal stresses and strains.
• Shear force and bending moment diagrams for beams.
• Bending and shear stresses in beams.
• Torsion of circular and non-circular shafts.
• Deflection of beams: double integration, Macaulay and moment-area methods.
• Columns and struts: Euler and Rankine formulae, buckling.
• Thin and thick cylinders and spherical shells.
• Theories of failure and strain energy.

4. Theory of Machines

• Kinematics: links, pairs, chains, degrees of freedom and inversions.
• Velocity and acceleration analysis, relative velocity method.
• Cams and followers: types, motion curves and analysis.
• Gears and gear trains: terminology, types and simple, compound, epicyclic trains.
• Governors and flywheels.
• Balancing of rotating and reciprocating masses.
• Vibrations: free, forced and damped, and critical speed.

5. Machine Design

• Design for static and dynamic loading, factor of safety.
• Fatigue and endurance limit, stress concentration, S-N curve.
• Design of bolts, nuts, keys, cotters and welded joints.
• Design of shafts, axles and couplings.
• Design of bearings: sliding and rolling contact types.
• Design of gears, springs, clutches and brakes.
• Theories of failure in design and production considerations.

6. Thermodynamics

• Zeroth, first and second laws of thermodynamics.
• Thermodynamic processes, work and heat, internal energy and enthalpy.
• Entropy, availability and irreversibility.
• Properties of pure substances and steam tables.
• Thermodynamic cycles: Carnot, Otto, Diesel, dual, Brayton and Rankine cycles.
• Air standard efficiency and mean effective pressure.
• Basics of psychrometry and gas mixtures.

7. Fluid Mechanics

• Fluid properties: viscosity, surface tension and compressibility.
• Fluid statics, pressure measurement, buoyancy and stability.
• Continuity, Bernoulli and momentum equations.
• Flow through pipes: losses, Darcy equation and minor losses.
• Viscous flow and laminar and turbulent flow in pipes.
• Boundary layer concepts and flow separation.
• Dimensional analysis and similitude.
• Impact of jets, hydraulic turbines and centrifugal pumps.

8. Heat Transfer

• Conduction: Fourier's law, steady and transient conduction, fins.
• Convection: free and forced convection, dimensionless numbers.
• Radiation: Stefan-Boltzmann law, view factors and heat exchange.
• Heat exchangers: LMTD and NTU methods, fouling factors.
• Boiling and condensation.

9. Manufacturing Engineering

• Casting: patterns, moulds, gating and defects.
• Welding: types of welds, welding defects and inspection.
• Metal forming: rolling, forging, extrusion and drawing.
• Machining: metal cutting principles, tool geometry and tool wear.
• Machine tools: lathe, milling, drilling, shaping and grinding.
• Metrology: limits, fits, tolerances, surface finish and measurement instruments.

10. Production Engineering

• Production planning and control.
• Forecasting and inventory management, EOQ.
• Scheduling and sequencing, line balancing.
• Work study: method study and time study.
• Quality control, statistical process control and control charts.
• Total quality management and reliability basics.

11. Materials Science

• Crystal structures and crystallography.
• Phase diagrams and the iron-carbon equilibrium diagram.
• Heat treatment processes and their effects.
• Ferrous and non-ferrous metals and alloys.
• Composites, ceramics and polymers.
• Mechanical properties and failure analysis.

12. Industrial Engineering

• Productivity and work measurement.
• Ergonomics and human factors.
• Facility location and plant layout.
• Value engineering and value analysis.
• Project management: PERT and CPM.
• Linear programming and optimisation basics.

13. Refrigeration and Air Conditioning

• Vapour compression refrigeration cycle and its components.
• Vapour absorption refrigeration system.
• Refrigerants and their properties, environmental aspects.
• Psychrometry and psychrometric processes.
• Cooling load calculation.
• Air conditioning systems and duct design.
• Compressors, condensers, evaporators and expansion devices.

14. IC Engines and Power Plants

• Engine cycles and air standard analysis.
• Combustion in SI and CI engines, fuel systems.
• Ignition, cooling and lubrication systems.
• Engine performance parameters and testing.
• Steam power plants and boilers.
• Gas turbine and combined cycles.
• Nuclear and hydro power plant basics.

15. Engineering Drawing

• Orthographic projections and projection of solids.
• Isometric and perspective views.
• Sectional views and hidden line conventions.
• Limits, fits, tolerances and surface roughness symbols.
• Geometric dimensioning and tolerancing basics.
• Assembly and detail drawings.
• Introduction to computer-aided drafting (CAD).

Subject-Wise Weightage and Priority

The official notification does not publish a fixed mark split inside Part II. As a study aid, the following priority guidance is generic and is intended only to help order revision effort.

• High priority: core subjects that connect to most other topics, such as Network Theory, Analog Electronics, Digital Electronics for Electronics; and Strength of Materials, Thermodynamics, Fluid Mechanics for Mechanical.
• Medium priority: subjects with moderate conceptual load, such as Signals and Systems, Control Systems, Communication Systems; and Theory of Machines, Machine Design, Heat Transfer.
• Lower but non-zero priority: specialised or descriptive subjects, such as Antennas, Electromagnetic Theory, Measurements; and Engineering Drawing, Industrial Engineering.
• Do not fully skip any listed subject; even one or two questions per subject can decide ranks given 0.25 negative marking.
• Build accuracy in high-priority subjects first, then spread coverage across the rest.
• Revise numerical-heavy subjects with formula sheets and repeated problem practice.

Weekly Study Plan (Generic Template)

• Day 1: Concepts of a high-priority subject, make a short formula sheet.
• Day 2: Solved examples and previous-type questions on the same subject.
• Day 3: Next high-priority subject, concepts and formula sheet.
• Day 4: Problem practice on that subject plus short aptitude practice.
• Day 5: Medium-priority subject, concepts and selected problems.
• Day 6: Mixed revision of the week plus one subject-wise sectional test.
• Day 7: Full-length or half-length mock test, followed by detailed error analysis.
• Keep one fixed daily slot for Part I (aptitude, reasoning, English, awareness) so it never lapses.
• Reserve the final two weeks for full revision, formula sheets, and mock tests only.
• Adjust the plan to your own weak areas; consistency matters more than intensity.

Study-Material Approach

• Anchor every subject to one standard reference book rather than many scattered sources.
• Prepare one-page formula or concept sheets per subject for rapid revision.
• Solve previous-year and standard objective questions after each topic, not before.
• Maintain an error log: record each wrong answer with the reason it was wrong.
• Revise the error log weekly; repeated mistakes usually point to a concept gap.
• Use mock tests to build speed and to practise elimination under negative marking.
• Keep all material aligned to the official syllabus; ignore unverified shortcuts.

Exam-Day Guidelines

• Carry the required identity and admit documents as specified by the official notification.
• Reach the test centre with ample time to complete verification without stress.
• Read the on-screen instructions before the timer begins.
• Attempt questions in a sensible order: start with your strongest subject areas.
• Keep a mental time budget of roughly one question per minute across the 2-hour window.
• Use elimination; because of 0.25 negative marking, avoid blind guessing.
• Keep a few minutes at the end for review of flagged questions.
• Do not leave obvious, easy questions unanswered.

Common Mistakes to Avoid

• Neglecting Part I because it carries only 25 marks; it is quick and scoring.
• Over-guessing under negative marking, which erodes a good score.
• Studying too many books per subject and finishing none.
• Skipping full-length mock tests and thus meeting the 2-hour pace only on exam day.
• Ignoring formula sheets, which slows down numerical subjects.
• Leaving the error log unrevised, so the same mistakes repeat.
• Trusting unofficial sources for recruitment facts instead of the official PDF.

Frequently Asked Questions (FAQ)

• What is the post? Probationary Engineer at Bharat Electronics Limited (BEL).
• How many vacancies are notified? 350, as per Advt. No. 17556/HR/All-India/2026.
• What is the selection process? A Computer-Based Test (CBT) followed by an Interview.
• What is the exam pattern? 125 questions for 125 marks in 2 hours; Part I has 25 marks and Part II has 100 marks.
• Is there negative marking? Yes, 0.25 mark is deducted for each wrong answer.
• What is the language of the paper? English.
• Which discipline is asked in Part II? The candidate's own engineering discipline; the reference lists cover Electronics Engineering and Mechanical Engineering.
• How should I divide time between the two parts? Attempt your stronger areas first and keep a rough one-question-per-minute pace.
• Where can I find the official details? Only on the official BEL website and the official notification PDF.
• Should I rely on this page for dates, fees or eligibility? No; this is a study aid and the official notification is the binding source.

Preparation Tips

• Part II (100 marks) determines most of the score; prioritise technical subjects.
• Use the official notification PDF (bel-india.in) as the final authority.
• Keep daily short practice for aptitude and reasoning.
• Practise full 125-question mock tests within 2 hours.
• Account for 0.25 negative marking; avoid guesses without elimination.
• Maintain quick formula/reference sheets for numerical subjects.

Official Links

• Bharat Electronics Limited (BEL) Official Website: https://bel-india.in/
• Notification PDF: https://bel-india.in/wp-content/uploads/2026/10/External-Ad-2026-English-1.pdf

Disclaimer

• This page is an independent study aid based on the official notification referenced by BEL.
• The official notification at https://bel-india.in/ is the sole binding source for all provisions.
• All dates, schemes, criteria and subjects should be validated against the latest official release.