RRB ALP Electronic Mechanic Syllabus

The RRB ALP CBT 2 Part B -- Electronic Mechanic 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 Electronic Mechanic trade at the ITI certificate level.

Quick Facts: ALP Electronic Mechanic 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 Electronic Mechanic trade theory and practical knowledge at the ITI level before the examination.

Detailed Electronic Mechanic Trade Syllabus (Part B)

The Electronic Mechanic 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. Electronic Devices and Circuits

•        Semiconductor Physics: covalent bonding; energy bands; intrinsic and extrinsic semiconductors; carrier concentration; drift and diffusion; Hall effect

•        p-n Junction Diode: V-I characteristics; forward and reverse bias; dynamic resistance; junction capacitance; diode applications (half-wave and full-wave rectifier; clipper; clamper; voltage multiplier; voltage regulator)

•        Zener Diode: characteristics; Zener voltage; voltage regulation; line and load regulation; Zener as voltage reference

•        Bipolar Junction Transistor (BJT): NPN and PNP; CE, CB, CC configurations; input and output characteristics; h-parameters; Q-point and biasing (fixed bias, voltage divider bias, emitter bias); small signal equivalent circuit; amplifier types (common emitter amplifier -- gain, phase, input and output impedance)

•        Field Effect Transistors: JFET (N-channel, P-channel; V-I characteristics; pinch-off voltage; Vgs(off); transconductance); MOSFET (depletion and enhancement type; construction; symbols; characteristics); applications

•        Special Devices: UJT (construction, characteristics, relaxation oscillator); SCR (construction, V-I characteristics, triggering, latching, holding current, applications in power control); DIAC; TRIAC; IGBT

•        Operational Amplifier: ideal OPAMP characteristics; virtual short; inverting amplifier; non-inverting amplifier; voltage follower; summing amplifier; difference amplifier; integrator; differentiator; comparator (open loop); Schmitt trigger; precision rectifier

•        Feedback Amplifiers: types (voltage-shunt, voltage-series, current-shunt, current-series); effect on gain, bandwidth, distortion, input and output impedance; Barkhausen criterion

•        Oscillators: RC phase shift oscillator; Wien bridge oscillator; Colpitts oscillator; Hartley oscillator; crystal oscillator -- frequency calculation and operation

•        Power Amplifiers: class A, B, AB, C; efficiency; push-pull; crossover distortion; heat sink; class D -- basics

2. Digital Electronics

•        Number Systems: binary; octal; hexadecimal; conversion; BCD; Gray code; excess-3; ASCII; 1's and 2's complement

•        Boolean Algebra: theorems (De Morgan's); SOP and POS; canonical forms; simplification using K-map (2, 3, 4 variable); Quine-McCluskey method

•        Logic Gates: AND, OR, NOT, NAND, NOR, XOR, XNOR; symbols; truth tables; universal gates; realization of any gate using NAND or NOR

•        Combinational Circuits: half adder and full adder; half subtractor and full subtractor; 4-bit parallel adder (IC 7483); comparator (IC 7485); multiplexer (4:1, 8:1, 16:1); demultiplexer; priority encoder; decoder (74138); BCD-to-7 segment decoder

•        Sequential Circuits: SR latch; gated SR; D latch; flip-flops (SR, JK, D, T, master-slave JK) -- truth tables, excitation tables, conversion

•        Registers: SISO, SIPO, PISO, PIPO; universal shift register (IC 74194); applications

•        Counters: ripple counter; synchronous counter; BCD counter; ring counter; Johnson counter; up-down counter; decade counter (IC 7490, IC 74192); modulo-N counter design

•        Logic Families: TTL (standard, LS, ALS, FAST, S); CMOS (4000, 74HC, 74HCT); ECL; comparison (speed, power, noise margin, fan-out, fan-in)

•        ADC and DAC: types of DAC (binary weighted, R-2R ladder); types of ADC (flash, successive approximation, dual slope); resolution; accuracy; sampling theorem

3. Signals and Systems

•        Signals: classification (continuous/discrete; periodic/aperiodic; energy/power; even/odd; deterministic/random)

•        Fourier Analysis: Fourier series; Fourier transform and inverse; properties; Parseval's theorem

•        Laplace Transform: properties; transfer function; poles and zeros; inverse Laplace transform

•        z-Transform: basics; DFT and FFT; application in digital signal processing

•        Filters: ideal filter characteristics; Butterworth and Chebyshev filters; active filter design (LPF, HPF, BPF, BSF using OPAMP); notch filter; all-pass filter

4. Communication Systems

•        Analog Modulation: AM (DSB-FC, DSB-SC, SSB, VSB) -- modulation index, bandwidth, power; FM -- frequency deviation, modulation index, Bessel functions, Carson's rule; PM

•        Demodulation: envelope detector; product detector; FM demodulator (limiter-discriminator, PLL)

•        Pulse Modulation: PAM; PWM; PPM; PCM (sampling, quantisation, quantisation noise, companding)

•        Digital Modulation: ASK; FSK; PSK (BPSK, QPSK); QAM; BER vs SNR

•        Transmission Lines: characteristic impedance; propagation constant; reflection coefficient; VSWR; Smith chart basics

•        Antennas: radiation pattern; gain; directivity; half-wave dipole; quarter-wave monopole; Yagi-Uda; loop antenna

•        Radio Communication: AM and FM broadcasting; superheterodyne receiver; IF amplifier; AGC; squelch; single sideband (SSB); two-way radio systems

•        Optical Fibre Communication: types (single mode, multimode step-index, multimode graded-index); attenuation; dispersion; connectors; splicing; OTDR; light sources (LED, LASER) and detectors (PIN, APD)

5. Microprocessor and Microcontroller

•        8085 Microprocessor: architecture; registers (accumulator, BC, DE, HL, SP, PC, flags); addressing modes; instruction set (data transfer, arithmetic, logical, branch, machine control); interrupt structure (RST 5.5, 6.5, 7.5, INTR, TRAP); 8085 programs

•        8086 Microprocessor: architecture; segmented memory; BIU and EU; instruction set overview; real mode; protected mode basics; interfacing

•        8051 Microcontroller: architecture; on-chip resources (RAM 128B, ROM 4KB, four 8-bit I/O ports, two timers, serial port, two interrupt levels); register set; addressing modes; instruction set; timer programming; serial port programming; interrupt programming

•        Peripheral Interfacing (8085 basis): 8255 PPI (modes 0, 1, 2); 8253/8254 timer; 8259 interrupt controller; 8251 USART; ADC0804; DAC0808

•        Embedded Systems: definition; embedded vs general-purpose; RTOS basics; microcontroller vs microprocessor; applications in consumer electronics, automotive, industry

6. Electronic Instruments and Measurement

•        Cathode Ray Oscilloscope (CRO): working principle; controls (time/div, volts/div, triggering); measurement of voltage, frequency, phase, pulse width; Lissajous figures

•        Function Generator: types of waveforms (sine, square, triangular, ramp, pulse); AM and FM modulation output; frequency range

•        Digital Multimeter (DMM): operation; AC/DC voltage and current; resistance; capacitance; frequency; diode test; transistor test; true RMS measurement

•        Signal Generators: RF signal generator; audio oscillator; sweep generator

•        Logic Analyser: purpose; timing diagram; state table; trigger; application in digital circuit debugging

•        Power Supply: bench power supply; regulated and unregulated; dual tracking supply; variable voltage and current control

•        LCR Meter: measurement of inductance, capacitance, resistance; Q-factor; impedance measurement; frequency of measurement

7. Electronic Circuit Assembly, PCB and Maintenance

•        Soldering: types (soft soldering, silver soldering); soldering iron types and selection; solder composition (Sn-Pb, lead-free SnAgCu); flux types; soldering procedure; desoldering (solder sucker, desoldering braid); SMT soldering

•        PCB Technology: single-sided; double-sided; multilayer; substrate materials (FR4, Rogers); copper thickness (oz); via types; pads; tracks; silk screen; solder mask; gerber files; PCB design basics

•        Component Identification: colour code of resistors; capacitor codes; inductor codes; transistor and IC identification; SMD component markings

•        Electronic Assembly: reading circuit diagrams; placing and soldering components; testing before power-on; electrostatic discharge (ESD) precautions; cleanroom basics

•        Fault Finding: systematic approach; signal tracing; substitution method; half-splitting; using oscilloscope and multimeter for fault location

•        Consumer Electronics Maintenance: TV (LED/LCD -- power supply, T-con, panel, backlight, main board faults); mobile phone basics; LED driver; SMPS (switched mode power supply) circuits

8. Computer and Networking Basics

•        Computer Hardware: CPU; RAM; ROM; hard disk; SSD; GPU; motherboard; power supply; I/O ports

•        Operating System: Windows and Linux basics; device drivers; file system; networking in OS

•        Networking: OSI model; TCP/IP; LAN; WAN; Ethernet; Wi-Fi; IP addressing; router; switch; hub; firewall

•        IT Security: password; encryption basics; virus protection; firewall; email security; phishing awareness

Weightage Analysis and Preparation Strategy

The 75 Part B questions are drawn proportionally from across all major topic areas of the Electronic Mechanic 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 Electronic Mechanic 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.