RRB ALP Electrician Trade Syllabus

The RRB ALP CBT 2 Part B -- Electrician trade syllabus covers the core technical knowledge tested in the 75-question, 60-minute trade-specific section of the RRB ALP 2027 examination. Part B is qualifying in nature only: candidates must score a minimum of 35% (26.25 marks out of 75) to clear Part B. The marks scored in Part B are NOT added to the final merit list. Merit is determined entirely by CBT 2 Part A scores. The syllabus for Part B is based on the NCVT (National Council for Vocational Training) ITI curriculum for the Electrician trade at the ITI certificate level.

Quick Facts: ALP Electrician Trade

Important Note on Part B

CBT 2 Part B is qualifying only. A candidate who scores below 35% in Part B is eliminated regardless of their Part A score. However, a candidate who clears the 35% threshold in Part B is ranked exclusively on their CBT 2 Part A score. This makes Part B preparation essential for elimination prevention, while Part A preparation determines the final rank. Candidates should ensure they are thoroughly familiar with the Electrician trade theory and practical knowledge at the ITI level before the examination.

Detailed Electrician Trade Syllabus (Part B)

The Electrician trade syllabus for RRB ALP CBT 2 Part B is drawn from the NCVT ITI curriculum and tests trade theory, applied knowledge, and practical understanding across the following topic areas:

1. Electrical Fundamentals and Circuit Theory

•        Electrical quantities: current (I), voltage (V), resistance (R), power (P), energy (E) -- units, instruments, formulae

•        Ohm's Law: statement; applications; limitations; verification

•        Series Circuits: total resistance; voltage distribution; current path; applications

•        Parallel Circuits: total resistance; current distribution; voltage across branches; applications

•        Series-Parallel Circuits: equivalent resistance; step-by-step simplification; numerical problems

•        Kirchhoff's Laws: KCL and KVL; node and mesh analysis; applications in complex networks

•        Power and Energy: P = VI = I2R = V2/R; energy calculation; efficiency; power factor

•        Electromagnetism: magnetic field; flux; flux density; permeability; MMF; reluctance; Faraday's Laws; Lenz's Law

•        Inductance: self-inductance (L); mutual inductance (M); coefficient of coupling; energy stored in inductor

•        Capacitance: capacitors in series and parallel; energy stored; charge and discharge; dielectric; types of capacitors

•        AC Fundamentals: generation of sinusoidal EMF; frequency; period; amplitude; RMS and average values; form factor; peak factor

•        AC Circuits: purely resistive, inductive, capacitive circuits; phasor diagrams; impedance; series RLC; resonance; power factor; correction

•        Three-Phase Systems: advantages; star (Y) and delta connections; line and phase voltages and currents; three-phase power; power measurement (two-wattmeter method)

2. Electrical Wiring

•        Wiring Systems: cleat wiring; casing-capping wiring; CTS/TRS sheath wiring; conduit wiring (surface PVC and concealed); comparison of wiring systems

•        Wiring Materials: conductors (copper and aluminium - types, sizes, current ratings); insulation types; conduit pipes; accessories (switches, sockets, junction boxes, ceiling roses)

•        Domestic Wiring: staircase wiring; godown wiring; two-way and three-way switching; wiring for fans, lights, and 5/15A socket outlets; distribution board; MCB selection

•        Industrial Wiring: motor control circuits; DOL starter wiring; star-delta starter wiring; forward-reverse control; interlocking; contactor logic

•        IE Rules: voltage levels; wiring regulations; spacing and clearance; earthing regulations; installation standards

•        Cable Selection: current carrying capacity; voltage drop calculation; derating factors; IS 694 for PVC cables; IS 1554 for cables

3. Electrical Machines

•        DC Generators: construction (armature, field, commutator); EMF equation; types (shunt, series, compound); characteristics; commutation; armature reaction; losses and efficiency

•        DC Motors: construction; back EMF; torque equation; types (shunt, series, compound); characteristics (speed-torque, speed-current); starting (resistance starter, DOL); speed control (armature resistance, field weakening, Ward-Leonard); braking; testing

•        Transformers: construction (core type, shell type); EMF equation; turns ratio; equivalent circuit; phasor diagram; voltage regulation; efficiency (all-day efficiency); losses (iron loss, copper loss); cooling methods; auto-transformer; three-phase transformer (star-delta, delta-star, delta-delta, star-star connections)

•        Three-Phase Induction Motor: construction; rotating magnetic field; slip; equivalent circuit; torque equation; torque-speed characteristics; starting methods (DOL, star-delta, auto-transformer, rotor resistance); speed control; power factor; losses; efficiency; testing

•        Single-Phase Induction Motor: types (capacitor start, capacitor run, shaded pole, split phase, repulsion); double revolving field theory; starting methods; applications

•        Synchronous Machines: construction; EMF equation; synchronous speed; armature reaction; voltage regulation; V-curves; parallel operation; synchronous motor starting; applications

•        Special Machines: universal motor; stepper motor; brushless DC motor; servo motor -- principles and applications

4. Electrical Protection, Switchgear and Installation

•        Fuses: types (rewirable, HRC/cartridge, glass tube); fuse ratings (current rating, breaking capacity); IS 2208 and IS 13703; selection criteria

•        Circuit Breakers: principle of arc interruption; types (air break -- ACB, MCCB, MCB; oil -- MOCB, BOCB; SF6; vacuum); ratings; applications; selection; testing

•        Protective Relays: principle; types (over-current, earth fault, distance, differential, Buchholz); relay co-ordination; current transformers and potential transformers

•        Earthing: necessity; types (plate, pipe, strip, ring); IS 3043; permissible earth resistance; methods of reducing earth resistance; testing (fall-of-potential, clamp-on meter)

•        Batteries: lead-acid battery (construction, chemical action, capacity, charging methods, testing, maintenance); alkaline batteries (Ni-Cd, Ni-Fe); VRLA; UPS systems; BMS basics

•        Illumination: luminous flux; luminous intensity; illuminance; luminance; laws (inverse square, Lambert's cosine); efficacy; types of lamps (incandescent, fluorescent, CFL, LED, HPSV, HPMV); lighting design; BIS lighting standards

•        Cable Jointing and Terminations: types of joints (straight through, tee, end sealing); jointing materials; ferrules; lugs; crimping tools; insulation taping; heat shrink

5. Electrical Measurement and Instruments

•        Indicating Instruments: PMMC; moving iron; dynamometer; induction type; errors; sensitivity; accuracy; resolution

•        Measurement of Electrical Quantities: ammeter; voltmeter; wattmeter (dynamometer); energy meter (induction type); power factor meter; frequency meter; ohmmeter; megger (insulation resistance)

•        Bridges: Wheatstone bridge (low resistance); Kelvin double bridge (very low resistance); AC bridges (Maxwell, Hay, Schering for L and C)

•        Oscilloscope: CRT principle; deflection; time base; measurement of voltage, current, frequency, phase, and time

•        Digital Instruments: digital voltmeter; digital multimeter; clamp meter; digital energy meter; data loggers

•        Transducers: thermocouple; thermistor; RTD; strain gauge; LVDT -- principle and applications

•        Testing Instruments: megger; earth resistance tester; tong tester; voltage tester; cable fault locator

6. Power Electronics and Drives

•        Semiconductor Devices: SCR (thyristor) - construction, V-I characteristics, triggering, commutation; TRIAC; DIAC; GTO; IGBT; MOSFET - characteristics and applications

•        Rectifiers: uncontrolled (single-phase half-wave, full-wave, three-phase); controlled (single-phase and three-phase SCR rectifiers); performance parameters; filters

•        Inverters: single-phase and three-phase voltage source inverters; PWM control; applications

•        Choppers: step-down; step-up; four-quadrant chopper; applications in DC drives

•        AC Voltage Controllers: single-phase; on-off and phase angle control; applications

•        DC Drives: speed control of DC motor using chopper; four-quadrant operation; regenerative braking

•        AC Drives: Variable Frequency Drive (VFD) - V/f control; types; applications in industry and railway traction

7. Electrical Safety, Maintenance and IS Codes

•        Electrical Hazards: electric shock; burns; fire; arc flash; their causes and prevention

•        Safe Working Practices: permit to work; LOTO (lockout-tagout); safe approach distances; PPE for electrical work

•        Maintenance Types: preventive maintenance; predictive maintenance; corrective maintenance; condition monitoring

•        Insulation Testing: megger test procedure; acceptable insulation resistance values; polarisation index; step voltage test

•        Motor Maintenance: visual inspection; vibration; bearing temperature; insulation resistance; winding resistance; dynamic balance

•        Important IS Codes: IS 732 (code of practice for electrical installations); IS 3043 (earthing); IS 1646 (electrical installations in buildings - fire safety); IS 694 (PVC cables)

Weightage Analysis and Preparation Strategy

The 75 Part B questions are drawn proportionally from across all major topic areas of the Electrician trade curriculum. Questions test both theoretical knowledge (principles, formulae, definitions, standards, safety rules) and applied understanding (fault diagnosis, calculations, material selection, tool usage, quality checks). The following approach maximises Part B preparation efficiency:

•        Revise systematically from NCVT ITI Electrician trade theory textbooks for Semester 1 and Semester 2

•        Focus on definitions, formulae, standards (BIS/IS codes), safety regulations, and technical specifications - these are directly testable as MCQs

•        Practise numerical calculations relevant to the trade (e.g., circuit calculations for Electrician, speed/feed calculations for Fitter/Turner/Machinist)

•        Study common faults, their causes, symptoms, and remedies for all major equipment in the trade

•        Revise tools, instruments, and equipment used in the trade: their names, specifications, uses, and maintenance

•        Solve previous years' RRB ALP Part B question banks for your specific trade

•        Allocate 60 minutes of daily trade-specific study alongside Part A preparation throughout the preparation period

Frequently Asked Questions

Q1. Is CBT 2 Part B merit-based or qualifying?

CBT 2 Part B is qualifying only. A minimum score of 35% is required to pass Part B. The marks scored in Part B are not added to the merit list. Only Part A marks determine the final ranking.

Q2. What happens if a candidate fails Part B?

Candidates who score below 35% in Part B are disqualified regardless of their Part A performance. They will not be considered for Document Verification or further selection stages.

Q3. How should I divide study time between Part A and Part B?

Since Part A determines the final merit and Part B is qualifying, prioritise Part A in your preparation. However, allocate at least 30 to 40% of study time to Part B to ensure you comfortably clear the 35% qualifying threshold. Aiming for 50 to 55 marks (about 70%) in Part B provides a safe buffer.

Q4. Is the Part B syllabus the same as the ITI exam syllabus?

Yes. The RRB ALP Part B syllabus is directly based on the NCVT ITI curriculum for the relevant trade. Candidates who have completed their ITI in the relevant trade and revised their course material systematically are well positioned for Part B.