TNPSC Diploma ITI Level Syllabus 2026: The Tamil Nadu Public Service Commission (TNPSC) conducts the Combined Technical Services (CTS) Diploma/ITI Level Examination annually to recruit candidates for various technical positions across Tamil Nadu government departments. With the 2026 notification scheduled for release on July 7, 2026, and the written examination commencing from September 20, 2026, aspirants must begin their preparation with a thorough understanding of the syllabus and exam pattern.
The TNPSC CTS Diploma/ITI Level Examination is designed to assess candidates for technical posts requiring specialized knowledge in their respective trades. The selection process consists of a written examination followed by certificate verification, with merit lists prepared based solely on written examination performance.
Key Dates for TNPSC CTS Diploma ITI Level 2026:
| Event | Date |
|---|---|
| Notification Release | July 7, 2026 |
| Written Examination Commencement | September 20, 2026 |
| Examination Duration | 7 Days |
The written examination follows a two-paper format designed to evaluate both general competency and technical expertise. Candidates must qualify in the Tamil eligibility test for their other papers to be evaluated.
Paper I is conducted in a single session and consists of three parts:
| Part | Subject | Questions | Marks |
|---|---|---|---|
| Part A | Tamil Eligibility Test (SSLC Standard) | 100 | 150* |
| Part B | General Studies | 75 | Included |
| Part C | Aptitude & Mental Ability | 25 | Included |
*Part A is qualifying in nature. Candidates must score a minimum of 40% (60 marks) for their other papers to be evaluated. These marks are NOT counted for ranking purposes.
The second paper focuses on the candidate’s trade-specific knowledge at the ITI/Diploma standard. This paper carries the highest weightage for final ranking:
| Subject | Questions | Marks | Duration |
|---|---|---|---|
| Trade Subject (ITI/Diploma Standard) | 200 | 300 | 3 Hours |
Final Merit Calculation: Ranking is based on 450 marks total (Paper I Part B & C: 150 marks + Paper II: 300 marks).
The syllabus is divided into two main sections:
This section carries 75% weightage, making it the most important part.
This section carries 25% weightage and is scoring.
The recruitment process generally includes:
TNPSC has released trade-specific syllabi for various ITI and Diploma-level technical subjects. The syllabus is comprehensive, covering both theoretical concepts and practical applications relevant to each trade.
The Instrument Mechanic syllabus covers ten comprehensive units focusing on measurement, control systems, and instrumentation principles:
Unit I: Safety & Basic Electricity
Elementary first aid, basic hand tools, precision measuring instruments
Ohm’s law, Kirchhoff’s law, series and parallel circuits
Electrical components: resistors, capacitors, inductors, transformers
AC/DC motors, stepper motors, and instrument transformers
Unit II: Electrical Measuring Instruments
Absolute and secondary instruments
PMMC instruments, Ohm meter, megger/insulation tester
AC instruments: MI, electrodynamometer, watt meter, energy meter
Unit III: Digital Electronics
PN junction diode, special diodes, transistors (CB, CE, CC configurations)
Rectifiers (half wave, full wave, bridge), filters, voltage regulators
Thyristor devices: SCR, TRIAC, DIAC
Operational amplifiers, IC 555 applications, logic gates and flip-flops
Unit IV: Measurement of Motion and Pressure
Static and dynamic characteristics of measurement systems
Stress and strain measuring instruments, tachometers, speedometers
Pressure sensors, transducers, manometers, calibration techniques
Unit V: Measurement of Flow
Basic fluid properties, flow rate units, flow meter types
Head type, variable area, mass flow meters
Solid flow measurement, calibration and installation procedures
Unit VI: Measurement of Level
Direct and indirect level measurement methods
Level instruments for open and closed channels
Conductivity and capacitance level instruments
Unit VII: Measurement of Temperature
Primary and secondary temperature standards
Thermocouples, RTD, thermistors, pyrometers
Recorders: strip chart, circular chart, paperless recorders
Unit VIII: Final Control Elements
Pneumatic, hydraulic, and electrical actuators
Control valves: types and flow characteristics
PLC systems, I/O devices, programming basics
Unit IX: Networking
Network types, cables, networking tools
SCADA and DCS fundamentals, HART communicators
Field bus, Ethernet, EDDL basics
Unit X: Basic Hydraulics, Pneumatics & Analytical Instruments
Pascal’s law, Bernoulli’s principle, hydraulic fluid properties
Pneumatic power system components
pH meter, conductivity meter, dissolved oxygen meter
For Field Assistant posts under TANGEDCO, the trade syllabus covers the following comprehensive topics:
| Topic | Key Areas |
|---|---|
| Safety Rules & Tool Handling | Safety signs, electrical hazards, prevention, first aid, protective equipment |
| Fundamentals of Electrical & Electronics | Ohm’s Law, Kirchhoff’s Law, AC/DC circuits, Star & Delta connections, transistors |
| Electrical Machines | DC generators, motors, alternators, single/three-phase motors, starting methods |
| Transformers | EMF equation, types, efficiency, cooling methods, protective devices |
| Measuring Instruments | Ammeter, voltmeter, multimeter, wattmeter, energy meter, megger |
| Power Generation | Thermal, nuclear, hydel, solar, wind energy, solar cells & panels |
| Transmission & Distribution | LV, MV, HV lines, conductors, insulators, substations, breakers, relays |
| Control Panels & Wiring | Relays, contactors, MCCB, MCB, ELCB, RCCB, domestic/industrial wiring |
For candidates in the Computer Hardware and Network Maintenance trade, the syllabus covers ten detailed units:
Unit I: Safety and Electronic Components
Semiconductor devices: DIAC, SCR, TRIAC, operational amplifiers
SMPS working principles, types, specifications, troubleshooting
Unit II: Computer Hardware Introduction
Computer generations, classifications, internal components
Processors (Intel: Celeron, Core i3/i5/i7, AMD), memory types (RAM, ROM, EPROM)
Hard disk drives (HDD) concepts: sector, track, cylinder
Unit III: Preventive Maintenance
POST, BIOS, CMOS, UEFI, power protection devices
RAID concepts, RAID levels, SATA/eSATA cables and connectors
Monitor characteristics, thick and thin clients, NAS
Unit IV: Operating System Installation and Utilities
Hard disk operations, partitioning (MBR and GPT), bad sector management
OS installation procedures, control panel, device driver installation
Linux commands, file system, shell scripting, UNIX concepts
Unit V: Laptop Hardware
Laptop block diagram, parts identification
Touchpad, docking station, wireless internet configuration
Unit VI: MS-Office and Peripherals
Word processing (MS-Word), spreadsheets (Excel), presentations (PowerPoint)
Printers: Dot Matrix, Laser, Inkjet, scanners, multifunction printers
Unit VII: Network Components and Internet
Network topologies (Star, Ring, Bus, Tree, Mesh), OSI and TCP/IP models
Network components: modems, hubs, routers, switches, access points
Internet protocols (HTTP, SMTP, FTP), DNS servers
Unit VIII: Network Security
Wired and wireless network security, remote device management
Surveillance using network devices, Aadhar-based authentication
Unit IX: Windows and Linux Server
Active Directory, DNS, DHCP, Routing and Remote Access
Apache web server, SAMBA, virtualization concepts
Unit X: Cloud Computing
World Wide Web, search engines, email systems, SPAM management
Cloud computing, virtualization (Type 1 and 2 hypervisors)
TNPSC has released syllabi for several other ITI standard technical subjects for the 2026 examination cycle:
Diesel Mechanic
Mechanic Agricultural Machinery
Fire Technology and Industrial Safety Management
Remotely Piloted Aircraft (Drone Pilot)
Desktop Publishing Operator
Plumber
Marine Engine Fitter
Painter General
Technician Power Electronics System
For Diploma-level candidates, subject-specific syllabi are available for various engineering disciplines including:
Civil Engineering
Mechanical Engineering
Electrical and Electronics Engineering
Electronics and Communication Engineering
Instrumentation Engineering
Automobile Engineering
Architecture
Textile Technology
Candidates can download the official TNPSC syllabus from the Commission’s website:
Official Syllabus Page: https://tnpsc.gov.in/English/syllabus.html
For each trade or diploma subject, separate PDF links are available. Candidates should carefully verify that they are referring to the syllabus for their specific post, as the content varies significantly across different trades.
Given the comprehensive nature of the syllabus, candidates should adopt a structured preparation approach:
With 300 marks and 200 questions, Paper II is the most critical component. Candidates should:
Thoroughly review the official trade syllabus
Practice numerical problems related to electrical measurements, circuit calculations, and instrumentation principles
Study practical applications and safety procedures
The General Studies section covers topics relevant to India and Tamil Nadu including history, geography, polity, and current affairs.
Practice quantitative aptitude, logical reasoning, and mental ability questions at SSLC standard.
While qualifying in nature, candidates must secure 40% in the Tamil Eligibility Test to have their other papers evaluated.
The syllabus and exam pattern are subject to modification until the date of notification publication. Candidates should verify the latest information from the official website.
Physical tests may be required for certain posts such as Field Assistant, which includes a mandatory pole climbing test.
Document verification is part of the selection process for all posts.
The TNPSC Diploma ITI Level Examination 2026 offers significant opportunities for technical candidates seeking government positions in Tamil Nadu. With the notification expected on July 7, 2026, and the examination scheduled from September 20, 2026, candidates have ample time to prepare systematically.
Success in this examination requires dedicated preparation focused on the specific trade syllabus, regular practice of technical problems, and consistent review of general studies topics. Candidates are advised to download the official trade syllabus from the TNPSC website and create a structured study plan covering all units comprehensively.
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