RRB JE Mechanical Engineering Syllabus

The RRB JE Mechanical Engineering discipline section tests knowledge of mechanical engineering at the Diploma and Degree level across thermodynamics, fluid mechanics, manufacturing processes, machine design, and industrial engineering. It carries 100 questions and 100 marks in CBT 2. Mechanical posts in Indian Railways cover rolling stock maintenance, carriage and wagon repair, locomotive maintenance, workshop operations, and general mechanical services.

Quick Facts: JE Mechanical Engineering

Detailed Mechanical Engineering Syllabus

1. Engineering Mathematics

•        Linear Algebra, Calculus, Differential Equations, Probability and Statistics, Numerical Methods (same scope as Civil Engineering Mathematics)

2. Engineering Mechanics and Solid Mechanics

•        Statics: equilibrium of forces; free body diagrams; resultant of force systems; moment and couple; centroid and centre of gravity of 2D and 3D bodies

•        Dynamics: kinematics (velocity, acceleration, relative motion); kinetics (Newton's Laws, impulse-momentum, work-energy); D'Alembert's principle; rotation; gyroscopic couple

•        Solid Mechanics: stress and strain; Hooke's Law; elastic constants; principal stresses (Mohr's circle); bending theory; shear stress distribution; torsion of shafts; Euler's column theory; strain energy; theories of failure (Rankine, Tresca, von Mises)

3. Theory of Machines (TOM) and Vibrations

•        Mechanisms: kinematic chains; Grashof's condition; inversions of slider-crank and four-bar mechanism; quick return mechanisms; steering mechanisms (Ackermann, Davis)

•        Velocity and Acceleration Analysis: relative velocity method; instantaneous centre method; Klein's construction for slider-crank

•        Cams and Followers: types of cams and followers; displacement diagrams; uniform velocity, SHM, and uniform acceleration motions; pressure angle and undercutting

•        Gears and Gear Trains: spur, helical, bevel, worm gears; gear terminology; law of gearing; gear trains (simple, compound, epicyclic); gear tooth forces

•        Governors: Watt, Porter, Proell, Hartnell governors; sensitivity, stability, isochronism; hunting

•        Balancing: static and dynamic balancing of rotating masses; balancing of reciprocating masses; primary and secondary balancing; V-engine balancing

•        Flywheels: fluctuation of energy and speed; coefficient of fluctuation; design of flywheel

•        Vibrations: free, forced, and damped vibrations; SDOF systems; natural frequency; resonance; vibration isolation; torsional vibrations; critical speed of shafts

•        Clutches and Brakes: friction clutches (single plate, multi-plate, cone, centrifugal); disc and drum brakes; heat dissipation

•        Belt Drives and Chain Drives: open and cross belt; velocity ratio; slip; tension ratio (Euler's equation); belt materials; roller chain; design considerations

4. Machine Design

•        Design Philosophy: types of loads; factor of safety; stress concentration; preferred numbers; standardisation

•        Fatigue: S-N curve; endurance limit; modifying factors (Marin's equation); Goodman and Soderberg criteria; Gerber parabola

•        Design of Joints: riveted joints (lap, butt; efficiency); welded joints (types; weld strength); threaded fasteners (bolt; nut; power screws; self-locking)

•        Design of Shafts and Couplings: combined bending and torsion; ASME code; rigid and flexible couplings; universal joints

•        Design of Springs: close-coiled helical spring; spring index; Wahl's correction factor; leaf spring; energy stored

•        Design of Bearings: sliding contact bearings (journal bearing; lubrication; Sommerfeld number); rolling contact bearings (types; life; dynamic and static load capacity; equivalent load)

•        Design of Gears: Lewis equation; surface fatigue; Barth velocity factor; module and pitch selection

•        Pressure Vessels: thin and thick cylinders; Lame's equations; autofrettage; end closures

5. Fluid Mechanics and Hydraulic Machines

•        Fluid Properties: viscosity (dynamic and kinematic); compressibility; surface tension; capillarity; ideal and real fluids

•        Fluid Statics: hydrostatic pressure; pressure on submerged surfaces; buoyancy; metacentre

•        Fluid Kinematics: Reynolds number; laminar and turbulent flow; continuity equation; stream function and velocity potential; flow visualisation

•        Fluid Dynamics: Bernoulli's equation; energy equation; momentum equation; flow measurement (venturimeter, orifice meter, pitot tube, rotameter)

•        Pipe Flow: Darcy-Weisbach equation; friction factor; minor losses; hydraulic gradient; water hammer; surge tanks; pipe networks

•        Boundary Layer Theory: development on flat plate; laminar and turbulent boundary layers; drag coefficient; separation

•        Hydraulic Machines: pelton wheel; Francis turbine; Kaplan turbine; specific speed; similarity laws; draft tube; centrifugal and axial flow pumps; NPSH; cavitation; pump selection and characteristics

•        Hydraulic Systems: hydraulic cylinders; valves (directional, pressure, flow control); accumulators; hydraulic circuits

6. Thermodynamics

•        Basic Concepts: system and control volume; properties; state; process; cycle; zeroth, first, second, third laws

•        First Law of Thermodynamics: internal energy; enthalpy; SFEE (steady flow energy equation); applications to nozzle, diffuser, turbine, compressor, heat exchanger

•        Second Law and Entropy: Kelvin-Planck and Clausius statements; heat engine, refrigerator, heat pump; Carnot cycle; entropy; irreversibility and availability

•        Properties of Pure Substances: p-v-T surface; steam tables; Mollier diagram; dryness fraction; throttling

•        Gas Cycles: Otto, Diesel, Dual, Stirling, Joule/Brayton cycles; air standard efficiency; mean effective pressure

•        Vapour Cycles: Rankine cycle; reheat and regenerative Rankine cycle; modifications; back work ratio

•        Refrigeration and Air Conditioning: vapour compression cycle; COP; refrigerants; vapour absorption cycle; psychrometrics (DBT, WBT, dew point, specific humidity, enthalpy of moist air); cooling load calculation; air distribution

•        Combustion Thermodynamics: stoichiometry; air-fuel ratio; calorific value (HCV and LCV); flue gas analysis (Orsat apparatus); Adiabatic Flame Temperature

7. Heat and Mass Transfer

•        Conduction: Fourier's Law; thermal conductivity; steady-state 1D conduction (plane wall, cylinder, sphere); thermal resistance; overall heat transfer coefficient; fins

•        Convection: Newton's Law of Cooling; dimensionless numbers (Re, Nu, Pr, Gr); forced convection over flat plate and inside pipes; natural convection; boiling and condensation

•        Radiation: Stefan-Boltzmann Law; emissivity; absorptivity; reflectivity; view factors; radiation exchange between surfaces; radiation shields; greenhouse effect

•        Heat Exchangers: types (parallel flow, counter flow, shell and tube, cross flow); LMTD method; NTU-effectiveness method; fouling factor

•        Mass Transfer: Fick's Law; diffusion; convective mass transfer; evaporative cooling; drying

8. Manufacturing Engineering

•        Metal Casting: types of casting processes (sand, die, investment, centrifugal, continuous); pattern design; gating system; risers; casting defects

•        Welding: fusion welding processes (SMAW, GMAW, GTAW, SAW, plasma); resistance welding (spot, seam); solid state welding (friction, friction stir, ultrasonic); welding metallurgy; defects and inspection

•        Metal Forming: forging (open die, closed die, drop forging); rolling; extrusion (direct, indirect); drawing; sheet metal operations (bending, deep drawing, blanking, piercing); press tools

•        Metal Cutting Theory: types of chips; Merchant's circle; cutting tool geometry; tool life (Taylor's equation); cutting fluids; machinability

•        Machine Tools: lathe (operations, taper turning methods); milling; drilling; boring; grinding; broaching; gear cutting

•        Unconventional Machining: EDM; ECM; LBM; USM; AJM; WJM; WC-ECM

•        Metrology and Quality Control: limits, fits, and tolerances (IS 919); measurement instruments (vernier caliper, micrometer, slip gauges, dial indicator, CMM, laser interferometer); surface finish measurement; geometric tolerances; SPC (control charts, Cp, Cpk)

•        CNC Machining: G and M codes; CNC programming; machining centres; DNC systems; FMS

•        Jigs and Fixtures: principles; types of jigs (template, box, plate, channel) and fixtures; locating and clamping devices; 3-2-1 locating principle

•        Powder Metallurgy: mixing; compaction; sintering; HIP; applications

9. Industrial and Production Engineering

•        Production Planning and Control: types of production; plant layout; material handling equipment; production scheduling; scheduling algorithms (SPT, LPT, Johnson's rule); MRP and ERP basics

•        Inventory Management: EOQ model; price-break model; ABC analysis; JIT concept

•        Work Study: method study; time study; work sampling; standard time; efficiency

•        Quality Management: TQM; quality costs; ISO 9001; six sigma; Taguchi methods; FMEA; reliability and maintainability

•        Engineering Materials: stress-strain diagrams; iron-carbon phase diagram; heat treatment of steel (annealing, normalising, quenching, tempering, case hardening); non-ferrous metals and alloys; composites; ceramics; polymers

•        Operations Research: linear programming (graphical and simplex); transportation and assignment problems; queuing theory; CPM and PERT

10. Automobile and Railway Mechanical Engineering

•        IC Engines: types; working cycles; engine components; carburetor; fuel injection; valve timing; lubrication; cooling; governing; emission norms (Bharat Stage VI)

•        Diesel Locomotive: diesel engine; power transmission; bogies; wheel-axle assembly; coupler; buffers; braking systems (vacuum, air, ADAS)

•        Carriage and Wagon: types; underframe; body; suspension systems (coil spring, rubber bolster spring, AIR SPRING); braking; air-conditioning of coaches; LHB vs ICF coaches; FIAT bogies; CBC couplers

•        Wheel and Axle: coning; rail inclination; gauge; back-to-back dimensions; permissible wear; ultrasonic testing; wheel turning

•        Brake System: vacuum brake; air brake (twin pipe and single pipe); automatic train protection; composition brake blocks

•        Rolling Stock Maintenance: POH (Periodic Overhaul) schedule; schedule of maintenance; hot axle; derailment investigations

Physics and Chemistry (15 Questions -- Class 12 / Diploma Level)

This section tests applied science knowledge at Class 12 and engineering diploma level. Key topics include:

•        Physics: Units and Measurement; Scalars and Vectors; Kinematics; Laws of Motion; Work, Energy and Power; Circular Motion; Gravitation; Properties of Matter (Elasticity, Viscosity, Surface Tension); Thermodynamics and Heat Transfer; Wave Motion and Sound; Electrostatics (Coulomb's Law, Electric Field, Potential); Current Electricity (Ohm's Law, Kirchhoff's Laws, Wheatstone Bridge); Magnetic Effects of Current; Electromagnetic Induction (Faraday's Law, Lenz's Law); Optics (Laws of Reflection and Refraction, Lenses, Mirrors, Optical Instruments); Modern Physics (Photoelectric Effect, Radioactivity, Nuclear Reactions)

•        Chemistry: Atomic Structure and Periodic Table; Chemical Bonding (Ionic, Covalent, Metallic); States of Matter and Gas Laws; Chemical Equilibrium and Le Chatelier's Principle; Acids, Bases, Salts and pH; Electrochemistry (Electrolysis, Galvanic Cells, Faraday's Laws); Thermochemistry; Chemical Kinetics; Corrosion and Prevention; Polymers (Natural and Synthetic); Fuels and Combustion; Environmental Chemistry

Basics of Computer Applications (10 Questions)

•        Computer Organisation: CPU, memory types (RAM, ROM, Cache), storage devices, input-output devices

•        Operating Systems: functions, types (Windows, Linux, Unix), file systems, process management

•        MS Office: Word (document formatting, tables, mail merge), Excel (formulae, charts, functions), PowerPoint (slide design, transitions)

•        Internet and Networking: types of networks (LAN, WAN, MAN), protocols (TCP/IP, HTTP, FTP, SMTP), IP addressing, DNS, cloud computing basics

•        Database Fundamentals: concept of database, RDBMS, SQL basics (SELECT, INSERT, UPDATE, DELETE), keys and relationships

•        Programming Concepts: flowcharts and algorithms, pseudocode, basic C language concepts (data types, control structures, functions, arrays)

•        Cybersecurity Basics: common threats (virus, malware, phishing), firewall, antivirus, data encryption basics

•        Digital Logic: binary, octal, hexadecimal number systems; logic gates (AND, OR, NOT, NAND, NOR, XOR); Boolean algebra basics

Environment and Pollution Control (10 Questions)

•        Environment: ecosystem components (biotic and abiotic), food chains and food webs, biogeochemical cycles (carbon, nitrogen, water)

•        Air Pollution: pollutants (SOx, NOx, CO, PM2.5, PM10, VOCs), sources, health effects, standards and control measures; vehicular emission norms (BS VI)

•        Water Pollution: sources, pollutants, effects on aquatic life and human health; treatment methods (primary, secondary, tertiary); BOD, COD, DO concepts

•        Soil Pollution: sources, effects, remediation techniques; land degradation and restoration

•        Noise Pollution: sources, health effects, standards (WHO and CPCB), control measures

•        Solid Waste Management: types of waste, 3R principle (Reduce, Reuse, Recycle), composting, sanitary landfill, incineration

•        Radioactive Waste: types of radiation, health effects, AERB regulations, storage and disposal

•        Environmental Legislation: Environment Protection Act 1986; Air (Prevention and Control of Pollution) Act 1981; Water (Prevention and Control of Pollution) Act 1974; National Green Tribunal (NGT); Environmental Impact Assessment (EIA)

•        Indian Railways and Environment: ISO 14001 certification in railways, green initiatives, bio-toilets, solar energy on railways, plastic-free stations

•        Climate Change: greenhouse gases, global warming, Kyoto Protocol, Paris Agreement, India's NDC commitments