BHEL Syllabus 2026 - Engineer Trainee Subject-Wise Topics, GATE Alignment, and Interview Guide

BHEL ET preparation starts with the GATE syllabus and extends into manufacturing-specific applied knowledge for the interview. This guide covers both layers with the depth the selection process requires.

BHEL ET Syllabus Framework

BHEL uses GATE scores for ET shortlisting - the written test is the GATE exam itself. What BHEL publishes as its "syllabus" for the purpose of interview and any direct test is essentially the GATE syllabus for each discipline.

Two preparation layers:

1. GATE layer: Full GATE syllabus for your discipline. Score above the competitive cutoff.
2. BHEL interview layer: Manufacturing, industrial systems, and product-specific knowledge applied to BHEL's operations.

BHEL Syllabus: Mechanical Engineering (ME)

The full GATE ME syllabus applies. BHEL interview extensions are marked with [BHEL PI].

Engineering Mathematics: Linear algebra, calculus, differential equations, complex variables, probability and statistics, numerical methods

Applied Mechanics: FBD, equilibrium, kinematics of particles and rigid bodies, friction, centroid, moment of inertia

Strength of Materials: Stress, strain, elastic constants, bending, shear, deflection, torsion, thin and thick cylinders, contact stresses, principal stresses (Mohr's circle), fatigue, column buckling

Theory of Machines: Kinematics (four-bar, slider-crank), velocity and acceleration analysis, gears (types, gear ratios, epicyclic), cams, governors, balancing, vibration (SDOF and MDOF, forced vibration, resonance, isolation)

Machine Design: Von Mises and Tresca criteria, fatigue (Soderberg, Goodman), shafts (design for torsion, bending), keys and splines, bearings (ball, roller, journal), bolted joints, welded joints, springs (helical, leaf, torsion), clutches, brakes, gear design

Fluid Mechanics and Thermal Sciences:

Fluid Mechanics: Properties, statics, kinematics, Bernoulli, continuity, momentum, pipe flow (Hagen-Poiseuille, friction factor, Moody chart), boundary layer, drag, lift, turbomachinery (pump and turbine specific speed, cavitation, NPSH, affinity laws), compressible flow (isentropic, normal shock)

Thermodynamics: Laws, ideal gas, steam tables, availability (exergy), Rankine cycle (simple, reheat, regenerative), gas power cycles (Otto, Diesel, Brayton), refrigeration (VCC, COP), psychrometrics

Heat Transfer: Conduction (1D steady state, composite walls, fins, transient), convection (forced, free, boundary layer correlations), radiation (view factors, grey body), heat exchangers (LMTD, NTU)

Manufacturing Technology:

• Metal casting: sand, die, investment casting; pattern allowances; gating and riser design
• Metal forming: rolling (load, draft, spread), forging (closed die, open die), extrusion, wire drawing, sheet metal operations (blanking, bending, deep drawing)
• Welding: SMAW, GMAW, GTAW, SAW, resistance welding; heat affected zone; weld quality; NDT methods (UT, RT, PT, MT)
• Machining: orthogonal and oblique cutting, Merchant's circle, cutting forces, Taylor tool life, surface roughness, unconventional machining (EDM, ECM, LBM)
• CNC machining: G-codes, M-codes, tool path programming concepts
• Powder metallurgy, ceramics, polymers processing

Industrial Engineering: PERT/CPM, scheduling (Johnson's algorithm), inventory models (EOQ, re-order point, safety stock), queuing theory, work study (time and motion study, method study), quality control (SPC, control charts, sampling inspection, acceptance sampling)

[BHEL PI] Manufacturing Extensions:

• Large-scale manufacturing at BHEL: power transformer winding and assembly, generator rotor winding, turbine blade precision machining, boiler drum fabrication
• Metrology in precision engineering: CMM operation, laser trackers for large component inspection
• Quality management: ISO 9001 in manufacturing, FMEA, Six Sigma concepts
• Material selection for high-temperature service: austenitic stainless steels, alloy steels for steam turbine components

BHEL Syllabus: Electrical Engineering (EE)

Engineering Mathematics: Standard GATE EE math

Electric Circuits: Network theorems (Thevenin, Norton, superposition, maximum power transfer), AC circuit analysis (impedance, admittance, power, power factor), transient analysis (RL, RC, RLC circuits), three-phase circuits, Laplace analysis of circuits, two-port networks

Electromagnetic Fields: Maxwell's equations, boundary conditions, energy density, Poynting vector, electromagnetic induction

Signals and Systems: Fourier transform, Laplace transform, Z-transform, sampling (Nyquist theorem), convolution, LTI systems, correlation

Electrical Machines:

• DC machines: construction, EMF and torque equations, armature reaction, commutation, motor starting, speed control (armature voltage, field weakening), braking
• Induction motors: construction, rotating magnetic field, slip, torque equation, equivalent circuit, starting methods (DOL, star-delta, autotransformer, VFD), speed control, cogging and crawling
• Synchronous machines: EMF equation, phasor diagram, voltage regulation (synchronous reactance, Potier), power angle (Pmax), synchronising power, loss of synchronism, salient pole (two-reaction theory)
• Transformers: construction (core, shell), EMF equation, equivalent circuit (exact and approximate), regulation, efficiency, OC and SC tests, all-day efficiency, autotransformer, three-phase connections, tap changers (ON-LOAD, OFF-LOAD)

Power Systems: Load flow (Gauss-Seidel and Newton-Raphson), short circuit (symmetrical and unsymmetrical using sequence networks), stability (transient and dynamic, swing equation, equal area criterion), economic dispatch (lambda iteration), HVDC (LCC and VSC), FACTS, power system protection (OC relay, differential relay, distance relay, buchholz)

Power Electronics: Thyristor (SCR) characteristics, triggering circuits, single and three-phase rectifiers (half-wave, full-wave), AC voltage regulators, choppers (DC-DC converters), DC motor drives, inverters (single-phase and three-phase, VSI, CSI), PWM techniques (SPWM, SHE), AC drives (VFD)

Control Systems: Block diagram, Mason's gain formula, transient response (time constant, rise time, settling time), steady-state error, frequency response (Bode, Nyquist, Nichols), root locus, PID tuning, state space representation, controllability and observability

[BHEL PI] EE Extensions:

• BHEL products: large power transformers (400kV, 765kV class), EHV circuit breakers (SF6), CVTs, bus bar insulators
• Generator protection: BHEL manufactures large synchronous generators; interview probes differential protection, stator earth fault, loss of field
• HVDC projects: BHEL participates in HVDC transmission; basic VSC-HVDC architecture
• Drives for industrial applications: variable frequency drives for large industrial motors, regenerative braking

BHEL Syllabus: Electronics and Communication (EC)

Engineering Mathematics: Standard GATE EC math

Electronic Devices: Semiconductor physics, p-n junction, BJT (CE, CB, CC configurations), FET (JFET, MOSFET), operational amplifiers (ideal and real, basic configurations), feedback amplifiers, oscillators, power amplifiers

Analog Circuits: Amplifier analysis (small signal), frequency response, active filters, waveform generators, D/A and A/D converters, regulated power supplies

Digital Circuits: Boolean algebra, combinational logic (multiplexers, encoders, decoders, adders), sequential logic (flip-flops, counters, shift registers), PLDs (PAL, GAL, FPGA), memory (RAM, ROM), microprocessor (8085/8086 architecture, instruction set), ADC and DAC types

Signals and Systems: Fourier series, Fourier transform, Laplace transform, Z-transform, sampling theorem, DFT, FFT, LTI system properties

Control Systems: Block diagram, Bode, Nyquist, root locus, PID, state space

Communications: Modulation and demodulation (AM, FM, PM, SSB), digital modulation (ASK, FSK, PSK, QAM), channel capacity (Shannon), noise (SNR, BER), antenna basics (gain, polarisation, radiation pattern)

Electromagnetic Theory: Maxwell's equations, transmission lines (VSWR, reflection coefficient, impedance matching, Smith chart), waveguides, microstrip design, optical fibers

[BHEL PI] EC Extensions:

• Industrial electronics at BHEL: instrumentation for manufacturing (temperature, pressure, flow sensors), data acquisition systems
• PLC and SCADA: BHEL installs control systems in power plants; basic PLC programming (ladder logic, function blocks)
• EMC/EMI: electromagnetic compatibility standards for industrial electronics

BHEL Syllabus: Computer Science (CS)

Engineering Mathematics: Discrete mathematics, probability, linear algebra, calculus

Programming and Data Structures: C/C++ programming, algorithms (time and space complexity, Big O), sorting (quicksort, mergesort, heapsort), searching (binary search, hash tables), trees (BST, AVL, B-trees), graphs (BFS, DFS, Dijkstra, Bellman-Ford, Kruskal, Prim)

Computer Organisation: Number systems, Boolean algebra, combinational and sequential circuits, processor design, instruction cycles, memory hierarchy (cache, RAM, virtual memory), I/O organisation, pipelining, hazards

Operating Systems: Process management, scheduling algorithms, synchronisation (semaphores, monitors), deadlock (detection, prevention, avoidance), memory management (paging, segmentation, virtual memory), file systems

Computer Networks: OSI model, TCP/IP, application layer protocols (HTTP, FTP, SMTP, DNS), transport layer (TCP, UDP, flow control, congestion control), network layer (IP, routing protocols - OSPF, BGP, RIP), data link layer (MAC, CSMA, token ring)

DBMS: Entity-relationship model, relational model, SQL (SELECT, JOIN, GROUP BY, subqueries), normalisation (1NF to BCNF), transaction management (ACID, concurrency control, two-phase locking), B+ tree indexing

Theory of Computation: Regular languages, context-free languages, automata (DFA, NFA, PDA), Turing machines, decidability, complexity (P, NP, NP-complete, NP-hard)

Compiler Design: Lexical analysis, parsing (top-down, bottom-up, LR), intermediate code generation, code optimisation (constant folding, dead code elimination), code generation

[BHEL PI] CS Extensions:

• ERP systems in manufacturing: SAP at BHEL, enterprise system integration
• SCADA and industrial communication protocols: Modbus, Profibus, OPC UA
• Cybersecurity for industrial systems: basic ICS security, access control

GATE Study Plan for BHEL

Frequently Asked Questions

What is the BHEL ET syllabus for 2026? The full GATE syllabus for your discipline. No separate BHEL written test syllabus for GATE-based recruitment.

What manufacturing topics are asked in BHEL interviews? Casting, welding, machining, quality control (SPC, NDT), material science for high-temperature applications, and BHEL product manufacturing processes.

What GATE score is needed for BHEL? Approximately 70 to 74 for ME and 69 to 73 for EE General category based on candidate reports.

Does BHEL have a separate written test? For GATE-based ET recruitment, no. Direct test may be conducted for non-GATE posts.

What is asked in the BHEL PI for Electrical candidates? Power transformers, large generators, switchgear, protection relays, and BHEL's EHV product range.

How is BHEL PI different from NTPC PI? BHEL is manufacturing-focused (product design, quality, production processes). NTPC is operations-focused (plant efficiency, systems maintenance).