ISRO Technician Electronics Mechanics Syllabus & Exam Pattern 2025: Download PDF

The Indian Space Research Organisation (ISRO) has released the ISRO Technician Electronics Mechanics syllabus and exam pattern 2025 at the official website. Candidates should become acquainted with the ISRO Technician Fitter Syllabus & Exam Pattern in order to understand the marking structure and topics covered. The selection process will include a screening test, written exam, and skill test. 

The exam is an objective type test, according to the ISRO Technician B Electronics Mechanics Exam Pattern. Each paper contains 80 multiple-choice questions.  To be eligible for the position of ISRO Technician B Electronics Mechanics, candidates must obtain the minimum ISRO Technician B cut-off marks.

Download the ISRO Technician B Electronics Mechanics Syllabus as PDF here!

 

🧑‍🔧 ISRO Technician-B Exam Pattern (Written Test)

📌 Stage 1: Written Test

• Type of Test: Objective-Type / Multiple Choice Questions (MCQs) 

• Number of Questions: 80 questions 

• Duration: 90 minutes (1.5 hours) 

• Marks:
  • +1 mark for each correct answer 
  • Negative marking: 0.33 marks deducted for each wrong answer

• Total Marks: 80 marks 

• Language: Usually in English+ Hindi (confirm in official notification).

📌 Qualifying Criteria (Example from VSSC Notification):

• UR & EWS: Minimum 32 out of 80 marks

• Other reserved categories: Lower minimum qualifying marks (e.g., 24/80) depending on reservation rules. 

🛠️ Stage 2: Skill / Trade Test

• After qualifying the written exam, candidates are called for a skill/trade test specific to their trade (e.g., Fitter, Electrician, Electronics Mechanic, etc.). 

• Purpose: Assess hands-on and practical abilities related to the specific Technician-B trade. 

• Marks: Skill test may be qualifying in nature (scores may not count toward final merit) — this varies by notification

  Stage	Exam / Test	Details
  Stage-1	Written Test (MCQ)	Conducted by Indian Space Research Organisation (ISRO)
  	Type of Questions	Objective / Multiple Choice Questions (MCQs)
  	Total Questions	80
  	Duration	90 Minutes (1.5 Hours)
  	Total Marks	80 Marks
  	Marking Scheme	+1 mark for correct answer
  	Negative Marking	−0.33 mark for each wrong answer
  	Question Level	ITI / Trade-based + Basic General topics
  	Language	English (as per notification)
  	Qualifying Marks (UR)	32 / 80 (example, varies by category)

Electronics Mechanics Syllabus

TECHNICAL THEORY- 80 MARKS

Basic Electrical Concepts

1. DC THEORY (electric charges, potential difference, voltage, current, resistance), Ohm’s Law and Kirchhoff’s Law, Maximum power transfer theorem, Active Passive Components, types, construction, color-coding and power rating.

2.  AC THEORY- Basics of AC , terms like +ve cycle, -ve cycle, frequency and time period,  Principles of induction, inductive reactance and types of inductors. Capacitance, capacitive reactance, types of capacitors and impedance, RLC Series, RLC parallel, resonance

3.  Cells & batteries:- types, construction, charging process and efficiency.
4.  Single-phase and three-phase supply.

5.  Magnet- Properties of magnets, electromagnetism and relays & Fuses.

6.  Transformer- principal, construction and types

7. Electrical and Electronics Measurement- Principles of electrical and electronic Measuring instruments, its Characteristics & Errors, Principles and parts of simple meters.

8.  Sensor and Transducer- Types of Sensors (RTD,  LVDT, Thermo couple, LDR, Photo Cell.

9.  CRO and DSO

10.  Semiconductor materials, Semiconductor devices, PN junction,
11.  Different types of diodes, rectifier configurations and filter circuits, Forward/reverse biasing of diodes.
12.  Transistors, types, construction and applications,

1. Special Transistor-  FET, JFET, MOSFET, IGBT and their characteristics.

2. Amplifiers  

3. Oscillators

13. Digital Electronics

1. Analog vs Digital signals.

2.  Number systems (Decimal, binary, octal, hexadecimal etc.).

3.  Various iogic gates and their truth tables

4. Logic Families

5. Combinational logic circuits, Adders, Sub-tractor, Decoders and Multiplexer.

6. Flip-flops and their applications.

7.  Counter

8. Register

14. a) Principle and working of Op-Amp and IC 555 timer.

     b). Ideal characteristics, advantages and applications.

15. 555 Timer

16. Soldering and De-soldering
a) Different types of soldering guns, temperature and wattages.
b) Solder materials, flux and other related materials.

17. SMPS

18. UPS

19. Chopper

20. Wave Shaping Circuit

21. Analog Communication- Modulation, Demodulation, PAM, PWM & PPM Techniques.

22. Digital Communication- PCM, DM, ADM, SHIFT KEYING

23. Mobile communication- Mobile communication and cell phones CDMA, GSM.

24. Fiber Optical Communication
a) Optical Amplifier, Properties, Advantages.
b) Optical Cables, Joints, Measuring Tools and Equipment

25. Radio Receiver

26. Microprocessor 8085,8086

27. Micro-Controller 8051,
a) Architecture & Applications of 8051.

28. Solar Power and Renewable Energy
a) Solar cells, conversion of solar radiation to electricity Test Equipment.
b) Principles of photo voltaic cells and PV characteristics, Solar Cell Constructions.

29. PCB

30. Surface Mount Technology (SMT)
a) SMT, advantages and components.
b) Soldering of SMT- assemblies, reflow soldering.
c) Static charges, ESD prevention and non-soldering interconnections.
d) Rework and repair concepts for PCBs.
e) PGA (Programmable Gated Array Packages)

31. Television- Principles of LCD and LED TVs, 3D TV and remote control operation.

32. Safety Device

33. Fire, Safety and Precations

34. Basic of DC GENERATOR

35. Basic of Alternator

36. Basic of DC and AC Motor

37. Basic of Computer

 38. Tools and Safety