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ISRO SAC Technician B Syllabus 2026, Exam Pattern
TISRO SAC Technician B Syllabus 2026, Exam Pattern, Exam Date 2026
Detail Information about ISRO SAC has published notification 2026 for the recruitment of Technician B vacancies. Those Candidates who are Interested to the following vacancy and completed all Eligibility Criteria can read the Notification & Apply Online. In this page we provide the Complete Syllabus of this Recruitment with Latest Update Exam Pattern and the Exam Date also.
ISRO SAC Syllabus 2026 - Overview
ISRO SAC Syllabus 2026 - Overview
| Organisation Name | Indian Space Research Organisation, Space Applications Centre, Ahmedabad |
| Post Name | Technician B (Fitter, Machinist, Electronics Mechanic, Lab Assistant Chemical Plant, IT/ ICTSM/ITESM, Electrician, Refrigeration and Air Conditioning, Pharmacist A) |
| Total Post | 55 |
| Application Mode | Online |
| Category | Syllabus and Exam Pattern |
| Official Website | isro.gov.in |
ISRO SAC Technician B Syllabus 2026
Trade Related Question :
Fitter) :
1. Marking off and layout tools, dividers, scribing block - description, classification, material, care & maintenance.
2. Try square, ordinary depth gauge, protractor- description, uses and cares.
3. Uses, care & maintenance of cold chisels- materials, types, cutting angles.
4. Power Saw, band saw, Circular saw machines used for metal cutting.
5. Micrometer- outside and inside - principle, features, parts graduation, reading, use and care, Micrometer depth gauge, parts, graduation, reading, use and care. Digital micrometer.
6. Vernier calipers, principle, construction, graduations, reading, use and care. Vernier bevel protractor, construction, graduations, reading, use and care, dial Vernier Caliper, Digital Vernier caliper, Vernier height gauge: material construction, parts, graduations (English & Metric) uses, care and maintenance.
7. Drilling processes: common type (bench type, pillar type, radial type), gang and multiple drilling machine, Determination of tap drill size.
8. Marking and measuring tools , wing compass, tinman9s square tools, snips, types and uses, Tinman9s hammers and mallets type-sheet metal tools, types, specifications, uses.
9. Trammel- description, parts, uses.
10. Hand grooves- specifications and uses.
11. Sheet and wire gauge.
12. Precautions in electric and gas welding. (Before, during, after), safety equipment and their uses.
13. Machines and accessories, welding transformer, welding generators, Welding hand tools: Hammers, welding description, types and uses, description, principle, method of operating, carbon dioxide welding.
14. H.P. welding equipment: description, principle, method of operating, L.P. welding equipment:description, principle, method of operating.
15. Types of Joints- Butt and fillet as per BIS SP:46-1988 specifications. Gases and gas cylinder description, kinds, main difference and uses.
16. Setting up parameters for ARC welding machines-selection of Welding electrodes.
17. Oxygen acetylene cutting – machine description, parts, uses, method of handling cutting torchdescription, parts, function and uses.
18. Drill- material, types, (Taper shank, straight shank) parts and sizes, Drill angle-cutting angle for different materials, cutting speed feed, R.P.M. for different materials, Drill holding devices - material, construction and their uses, Drill troubles: causes and remedy. Drill kinds: Fraction, metric, letters and numbers, grinding of drill.
19. Counter sink, counter bore and spot facing-tools and nomenclature,
20. Reamer - material, types (Hand and machine reamer), kinds, parts and their uses, Determining hole size (or reaming), Reaming procedure.
21. Screw threads: terminology, parts, types and their use, Screw pitch gauge: material, parts and uses.
22. Taps British standard (B.S.W., B.S.F., B.A. & B.S.P.) and metric /BIS (coarse and fine) material, Parts (shank body, flute, cutting edge).
23. Equality of lips, correct clearance, dead centre, length of lips.
24. Grinding wheel: Abrasive, grade structures, bond, specification, use, mounting and dressing, Selection of grinding wheels. Bench grinder parts and use.
25. Interchange ability: Necessity in Engg, field definition, BIS Definition, types of limit, terminology of limits and fits- basic size, actual size, deviation, high and low limit, zero line, tolerance zone, Different standard systems of fits and limits. British standard system, BIS system.
26. Maintenance : -Total productive maintenance, Autonomous maintenance, Routine maintenance, Maintenance schedule, Retrieval of data from machine manuals, Preventive maintenance-objective and function of Preventive maintenance, Section inspection, Visual and detailed, lubrication survey, system of symbol and colour coding, Revision, simple estimation of materials, use of handbooks and reference table, Possible causes for assembly failures and remedies, Installation, maintenance and overhaul of machinery and engineering equipment.
27. Templates and Radius/fillet gauge, feeler gauge, hole gauge, and their uses, care and maintenance.
28. Metallurgical and metal working processes such as Heat treatment.
29. Various heat treatment methods - normalizing, annealing, hardening and tempering, purpose of each method, tempering colour chart.
30. Annealing and normalizing, Case hardening and carburising and its methods, process of carburising (solid, liquid and gas).
31. Gauges and types of gauge commonly used in gauging finished product, Method of selective assembly 8Go9 system of gauges, hole plug basis of standardization.
Machinist :
1. Drill, Tap, Die-types & application. Determination of tap drill size. Basic terminology related to screw thread. Reamer- material, types (Hand and machine reamer), parts and their uses, determining hole size for reaming, Reaming procedure.
2. Vernier height gauge: construction, graduations, Vernier setting & reading. Care and maintenance of Vernier height Gauge. Vernier caliper-its parts, principle, reading, uses & care. Outside micrometrics parts, principle, reading, uses, Reading of Vernier Micrometer), care & maintenance.
3. Drilling machines-types &their application, construction of Pillar & Radial drilling machine. Countersunk, counter bore and spot facing-tools and nomenclature. Cutting Speed, feed, depth of cut and Drilling time calculations.
4. Interchangeability: Necessity in Egg., field, Limit- Definition, types, terminology of limits and fits basic size, actual size, deviation, high and low limit, zero-line, tolerance zone, allowances. Different standard systems of fits and limits. (British standard system & BIS system)
5. Slotter– Classification, principle, construction, Safety precaution. Introduction and their indexing process on a Slotter by its Rotary table graduations. Driving mechanisms, quick return motion and speed ratio. Safety points to be observed while working on a Slotter. Job holding devices-vice, clamps, V-block, parallel block etc. Slotting tools- types, tool angles. Spline – types and uses.
6. Coolant & lubricant –Introduction, types, properties, application & applying methods.
7. Milling Machine: Introduction, types, parts, construction and specification. Driving and feed mechanism of Milling Machine. Different types of milling cutters & their use. Cutter nomenclature. Different milling operations - plain, face, angular, form, slot, gang and straddle milling etc. Up and down milling. Different types of milling attachments and their uses.
8. Jigs and Fixtures– Introduction, principle, types, use, advantages & disadvantages. Properties of metals general idea of physical, mechanical properties of metals, colour, weight, hardness toughness, malleability, ductility their effect on machinability.
9. Heat Treatment – Introduction, necessity, types, Purposes, different methods of Heat Treatment. Heat Treatment of Plain Carbon Steel. Indexing-introduction & types. Indexing head-types & constructional details, function of indexing plates and the sector arms. Calculation for direct and simple indexing.
10. Grinding – Introduction, grinding wheel- abrasive, types, bond, grade, grid, structure, standard marking system of grinding wheel, selection of the grinding wheel. Dressing, types of dresser. Glazing and Loading of wheels – its causes and remedies. Roughness values and their symbols.
11. Surface Grinder –Types, Parts, construction, use, methods of surface grinding
12. Cylindrical grinder: Introduction, parts, construction, types, specification, safety, different methods of cylindrical grinding. Cutting speed, feed, depth of cut, machining time calculation. Wet grinding and dry grinding, various types of grinding wheels and their application, grinding defects and remedies.
13. Tool & cutter grinder- Introduction, parts, construction, use and specification, different types of tool rest & their application. Various methods of cutter grinding. Various cutter grinding attachments and their uses.
14. Geometrical tolerances, definition, symbol and their application. Depth Micrometer – Parts, reading, uses and safety. Different types of micrometers and their uses. Inside Micrometer – its parts, reading and uses. Bore Dial Gauge – its parts, reading and uses. Telescopic gauge. Gauges – different types and their uses, difference between Gauges and Measuring Instruments. Gear introduction, use and type. Elements of a spur gear. Gear tooth of each forms types, merits and demerits of each.
15. Vertical Milling Machine- its parts. Method of boring in Vertical milling. Difference between Horizontal and Vertical Milling Machine. Reamer – types, elements and uses. Calculations for cutting Reamer. Twist drill-nomenclature, cutter selection. Calculations for cutting twist drill.
16. VMC.CNC technology basics, Comparison between CNC VMC and conventional milling machines. Concepts of positioning accuracy, repeatability. CNC VMC machine elements and their functions -bed, chuck, Auto tool changer (ATC), ball screws, guide ways, LM guides, coolant system, hydraulic system, chip conveyor, rotary table, pallet changer, console, spindle motor and drive, axes motors, encoders, control switches. Feedback, CNC interpolation, open and close loop control systems. Machining operations and the tool paths in them - Face milling, Side milling, Pocket milling, Drilling, Countersinking, Rigid tapping, floating tapping Reaming, Rough boring, Finish boring, Spot facing. Concept of Co-ordinate geometry& polar coordinate points, concept of machine axis, axes convention on CNC lathes, work zero, machine zero.
17. Absolute and incremental programming. Programming - sequence, formats, different codes and words. ISO G and M codes for CNC milling. Canned cycles for drilling, peck drilling, reaming, tapping, finish boring. Subprograms.
18. Writing part programs as per drawing & check using CNC program verification software. Process planning, work holding, tool and cutting parameters selection according to the part geometry and dimensions. Program checking in single block and dry run modes -necessity and method. Tool offsets adjustment on first part for close tolerance dimensions, by oversizing (for outside dimensions) or under sizing (for inside dimensions) the dimension to prevent part rejection.
19. Process planning & sequencing, tool layout & selection and cutting parameters selection. Work offset, tool length offset, tool radius offset. Work holding with temporary holding and fixtures. Truing of part and fixture. Machine operation modes - Jog, MDI, MPG, Edit, Memory. Entering and editing programs on machine console, entering offsets data in offsets page. Use of Emergency stop, Reset, Feed rate override, spindle speed override, edit lock on/off buttons and keys.
20. Collisions due to program errors, effects of collisions. Costs associated with collisions - tool breakage, machine damage, injuries. Program execution in different modes like manual, single block and auto. Collisions due to improper machine setup and operation - causes and effects. Recovering from collisions. State the importance of Helical inter-polar and thread milling, advantage and limitation in CNC machine.
21. Tool wear and necessity for wear offsets change, entering wear offsets in offsets page. Effects of sudden machine stoppage due to power shutdown or use of emergency stop. Restarting machine from sudden stoppage.
22. Means of program transfer through electronic media. Productivity concepts, cycle time, machine down time, causes of down time - breaks, machine breakdown, inspection, part loading and unloading, chip cleaning. Effect of down time on profitability, reducing down time. Machine hour rate, components of machine hour rate - principal repayment, interest, overheads (power, tooling, space, salaries, indirect expenses). Calculation of machining cost, cost of down time.
23. Cutter radius compensation (CRC) and why it is necessary. Cutting tool materials, application of various materials. Cutting tool geometry for face mill, end mill, drill, countersink, tap, finish bore, reamer. Insert holding methods face mill, insert type end mill and insert type drill. Insert cutting edge geometry. Cutting parameters- cutting speed, feed rate, depth of cut. Tool wear, tool life, relative effect of each cutting parameter on tool life. Selection of cutting parameters from a tool manufacturer's catalogue for various operations.
24. Calculations for cutting helical slab/ cylindrical cutter. Calculations for cutting End Mill cutter. Bevel gear-elements, types, application, calculation for cutting bevel gear. Cam-types, elements & application, Plate cam manufacturing & calculations. Drum cam- its calculation, advantages, types of follower & its purposes. Worm wheel-application, elements & calculation, Worm-calculation. Types of Keys and their uses. Variation - types and causes. Testing of Gear and error.
2. Vernier height gauge: construction, graduations, Vernier setting & reading. Care and maintenance of Vernier height Gauge. Vernier caliper-its parts, principle, reading, uses & care. Outside micrometrics parts, principle, reading, uses, Reading of Vernier Micrometer), care & maintenance.
3. Drilling machines-types &their application, construction of Pillar & Radial drilling machine. Countersunk, counter bore and spot facing-tools and nomenclature. Cutting Speed, feed, depth of cut and Drilling time calculations.
4. Interchangeability: Necessity in Egg., field, Limit- Definition, types, terminology of limits and fits basic size, actual size, deviation, high and low limit, zero-line, tolerance zone, allowances. Different standard systems of fits and limits. (British standard system & BIS system)
5. Slotter– Classification, principle, construction, Safety precaution. Introduction and their indexing process on a Slotter by its Rotary table graduations. Driving mechanisms, quick return motion and speed ratio. Safety points to be observed while working on a Slotter. Job holding devices-vice, clamps, V-block, parallel block etc. Slotting tools- types, tool angles. Spline – types and uses.
6. Coolant & lubricant –Introduction, types, properties, application & applying methods.
7. Milling Machine: Introduction, types, parts, construction and specification. Driving and feed mechanism of Milling Machine. Different types of milling cutters & their use. Cutter nomenclature. Different milling operations - plain, face, angular, form, slot, gang and straddle milling etc. Up and down milling. Different types of milling attachments and their uses.
8. Jigs and Fixtures– Introduction, principle, types, use, advantages & disadvantages. Properties of metals general idea of physical, mechanical properties of metals, colour, weight, hardness toughness, malleability, ductility their effect on machinability.
9. Heat Treatment – Introduction, necessity, types, Purposes, different methods of Heat Treatment. Heat Treatment of Plain Carbon Steel. Indexing-introduction & types. Indexing head-types & constructional details, function of indexing plates and the sector arms. Calculation for direct and simple indexing.
10. Grinding – Introduction, grinding wheel- abrasive, types, bond, grade, grid, structure, standard marking system of grinding wheel, selection of the grinding wheel. Dressing, types of dresser. Glazing and Loading of wheels – its causes and remedies. Roughness values and their symbols.
11. Surface Grinder –Types, Parts, construction, use, methods of surface grinding
12. Cylindrical grinder: Introduction, parts, construction, types, specification, safety, different methods of cylindrical grinding. Cutting speed, feed, depth of cut, machining time calculation. Wet grinding and dry grinding, various types of grinding wheels and their application, grinding defects and remedies.
13. Tool & cutter grinder- Introduction, parts, construction, use and specification, different types of tool rest & their application. Various methods of cutter grinding. Various cutter grinding attachments and their uses.
14. Geometrical tolerances, definition, symbol and their application. Depth Micrometer – Parts, reading, uses and safety. Different types of micrometers and their uses. Inside Micrometer – its parts, reading and uses. Bore Dial Gauge – its parts, reading and uses. Telescopic gauge. Gauges – different types and their uses, difference between Gauges and Measuring Instruments. Gear introduction, use and type. Elements of a spur gear. Gear tooth of each forms types, merits and demerits of each.
15. Vertical Milling Machine- its parts. Method of boring in Vertical milling. Difference between Horizontal and Vertical Milling Machine. Reamer – types, elements and uses. Calculations for cutting Reamer. Twist drill-nomenclature, cutter selection. Calculations for cutting twist drill.
16. VMC.CNC technology basics, Comparison between CNC VMC and conventional milling machines. Concepts of positioning accuracy, repeatability. CNC VMC machine elements and their functions -bed, chuck, Auto tool changer (ATC), ball screws, guide ways, LM guides, coolant system, hydraulic system, chip conveyor, rotary table, pallet changer, console, spindle motor and drive, axes motors, encoders, control switches. Feedback, CNC interpolation, open and close loop control systems. Machining operations and the tool paths in them - Face milling, Side milling, Pocket milling, Drilling, Countersinking, Rigid tapping, floating tapping Reaming, Rough boring, Finish boring, Spot facing. Concept of Co-ordinate geometry& polar coordinate points, concept of machine axis, axes convention on CNC lathes, work zero, machine zero.
17. Absolute and incremental programming. Programming - sequence, formats, different codes and words. ISO G and M codes for CNC milling. Canned cycles for drilling, peck drilling, reaming, tapping, finish boring. Subprograms.
18. Writing part programs as per drawing & check using CNC program verification software. Process planning, work holding, tool and cutting parameters selection according to the part geometry and dimensions. Program checking in single block and dry run modes -necessity and method. Tool offsets adjustment on first part for close tolerance dimensions, by oversizing (for outside dimensions) or under sizing (for inside dimensions) the dimension to prevent part rejection.
19. Process planning & sequencing, tool layout & selection and cutting parameters selection. Work offset, tool length offset, tool radius offset. Work holding with temporary holding and fixtures. Truing of part and fixture. Machine operation modes - Jog, MDI, MPG, Edit, Memory. Entering and editing programs on machine console, entering offsets data in offsets page. Use of Emergency stop, Reset, Feed rate override, spindle speed override, edit lock on/off buttons and keys.
20. Collisions due to program errors, effects of collisions. Costs associated with collisions - tool breakage, machine damage, injuries. Program execution in different modes like manual, single block and auto. Collisions due to improper machine setup and operation - causes and effects. Recovering from collisions. State the importance of Helical inter-polar and thread milling, advantage and limitation in CNC machine.
21. Tool wear and necessity for wear offsets change, entering wear offsets in offsets page. Effects of sudden machine stoppage due to power shutdown or use of emergency stop. Restarting machine from sudden stoppage.
22. Means of program transfer through electronic media. Productivity concepts, cycle time, machine down time, causes of down time - breaks, machine breakdown, inspection, part loading and unloading, chip cleaning. Effect of down time on profitability, reducing down time. Machine hour rate, components of machine hour rate - principal repayment, interest, overheads (power, tooling, space, salaries, indirect expenses). Calculation of machining cost, cost of down time.
23. Cutter radius compensation (CRC) and why it is necessary. Cutting tool materials, application of various materials. Cutting tool geometry for face mill, end mill, drill, countersink, tap, finish bore, reamer. Insert holding methods face mill, insert type end mill and insert type drill. Insert cutting edge geometry. Cutting parameters- cutting speed, feed rate, depth of cut. Tool wear, tool life, relative effect of each cutting parameter on tool life. Selection of cutting parameters from a tool manufacturer's catalogue for various operations.
24. Calculations for cutting helical slab/ cylindrical cutter. Calculations for cutting End Mill cutter. Bevel gear-elements, types, application, calculation for cutting bevel gear. Cam-types, elements & application, Plate cam manufacturing & calculations. Drum cam- its calculation, advantages, types of follower & its purposes. Worm wheel-application, elements & calculation, Worm-calculation. Types of Keys and their uses. Variation - types and causes. Testing of Gear and error.
Electronics Mechanic) :
1. Hand tools and their uses
Identify, tools; filing, hacksawing, fitting, drilling, and basic metalwork.
2. Basics of AC and Electrical Cables
Identify, test, measure, and prepare electrical cables; basic electrical concepts and cable specs.
3. Single range meters -set meters; check continuity; measure voltage and current.
4. Cells & Batteries
Identify terminals, measure voltage, charge/discharge, test readiness, types and specifications.
5. AC & DC measurements
Use multimeter, CRO/DSO, and function generator to measure and observe electrical parameters; learn meter types, controls, and maintenance
6. Digital Storage Oscilloscope
Identify controls, measure signal parameters, print signals, and build/test function generator; learn features and applications of DSO and CRO.
7. Soldering/ De-soldering and Various Switches
Practice soldering/de-soldering, repair PCB tracks, identify and use various switches, and make switch panel boards.
8. Active and Passive Components
Identify and test resistors, inductors, capacitors, relays, and circuit breakers; Ohm’s and Kirchhoff’s laws; RC circuits and resonance circuits.
9. Power Supply Circuits
Test diodes and transformers; build and test rectifiers; measure ripple; voltage regulators; transformer types and diode basics.
10. IC Regulators
Test diodes and transformers, build and test rectifiers and voltage regulators, measure ripple and regulation. Construct fixed and variable IC-based voltage regulators (78/79 series, LM317T, IC723). diode biasing, transformer types, rectifier efficiency, and regulator principles.
11. Transistor
Identify and test transistors, understand construction and terminals, learn biasing, characteristics, and applications as switches and amplifiers.
12. Amplifier
Build and test various transistor amplifiers (fixed, emitter, voltage divider bias, common emitter, collector, biasing, configurations, characteristics, gain, and feedback.
13. Oscillators
Build and test Colpitts, Hartley, RC phase shift, and crystal oscillators; demonstrate astable, monostable, and bistable multivibrators; understand positive feedback.
14. Wave shaping circuits
Build and test shunt, series, dual clippers, clampers, and Zener diode peak clippers;
15. Power Electronic Components
Identify power components; build and test FET amplifiers, SCR circuits, TRIAC dimmers, and UJT oscillators;, terminals, and applications.
16. MOSFET & IGBT
Identify and test MOSFETs and IGBTs, characteristics, switching speed, and differences from FETs and transistors.
17. Opto Electronics
Test LEDs, circuits with photovoltaic cells, photodiodes, and phototransistors; characteristics and applications of optical sensors and opto-isolators.
18. Basic Gates
truth tables of logic gates; build gates using NAND/NOR; test digital ICs; learn digital basics and number systems.
19. Combinational Circuits:
Build and test adders, subtractors, decoders, encoders, multiplexers, and demultiplexers.
20. Flip Flops:
Identify and test various flip-flop ICs (RS, D, T, JK), latches, and understand timing and applications.
21. Op-Amp & Timer 555 Applications:
Test analog ICs, Op-Amp circuits (amplifiers, integrators, comparators), and construct timer 555 circuits (astable, monostable, VCO, PWM).
22. Electronic Cables & Connectors
Types of cables/connectors, soldering, testing, and PC/network cable setups.
23. Basic SMD (2, 3, 4 terminal components)
Identify, de-solder, and solder 2, 3, 4 terminal SMD parts; check PCB continuity; find loose solder and broken tracks. Learn SMD advantages, reflow soldering, hardware selection, and inspection.
24. SMD Soldering and De-soldering
Set up SMD soldering station, use crimping tools for various IC packages, solder/de-solder ICs, rework defective components, inspect solder quality, and understand SMT equipment like pick-and place machines and reflow ovens.
25. PCB Rework
Inspect, test, and repair single and double-layer PCBs. Detect solder joint defects, fix damaged tracks, pads, and solder masks. Learn ESD prevention and non-soldering interconnections.
26. Protection devices
Identify types of fuses, holders, MCBs, ELCBs, contactors, and relays; understand fuse ratings and working voltages. Test MCBs, ELCBs, DC motors, and stepper motors; understand motor control and protection devices.
27. Communication electronics
Practice AM/FM modulation and demodulation, test transmitters/receivers, study antennas, modulation types, and digital signal techniques.
28. Microcontroller (8051)
Identify ICs, configure ports, blink LEDs, use timers, write simple programs. Learn architecture, memory, registers, and compare 8051/8052. Intro to PIC.
29. Sensors, Transducers used in IoT Applications
Identify and use sensors (temperature, proximity, load cells). Measure and detect signals. Basics of transducers. Connect and program microcontroller (LED, buzzer, sensors). Intro to IoT and smart systems.
30. Analog IC Applications
Build simple projects using ICs 741, 723, 555, 7106, 7107.
Examples: laptop protector, battery monitor, metal detector, smoke detector, water level controller, etc.
Focus on component use and IC data. (45 Hrs practical + 9 Hrs discussion)
31. Digital IC Applications
32. Fiber optic communication
33. Digital panel Meter
Use LED/LCD displays with driver ICs to show text and measure current.
Learn seven-segment displays, multiplexing, and DPM ICs.
34. SMPS and Inverter
Identify, dismantle, test, troubleshoot, repair, install SMPS and inverters.
Build/test DC-DC converters. Learn working principles.
35. UPS
Connect and test battery and load; identify UPS components and circuits; monitor voltages; perform backup load test. UPS types, principles, specs, installation, and protections.
36. Solar Power (Renewable Energy System)
Wire solar controller, connect batteries & inverter, test solar panel with load, install solar inverter, measure charging time. Learn solar energy principles, PV cells, modules, systems, controllers, and safety.
37. LED Lights
Identify and connect LED stacks and circuits. Series/parallel LED strings and matrix. Test voltages.
LED panel types and driving.
38. LCD and LED TV
Identify, dismantle, troubleshoot, repair, and test TVs and remotes.
Connect external devices. Learn basics of TV types, interfaces, and remotes.
Identify, tools; filing, hacksawing, fitting, drilling, and basic metalwork.
2. Basics of AC and Electrical Cables
Identify, test, measure, and prepare electrical cables; basic electrical concepts and cable specs.
3. Single range meters -set meters; check continuity; measure voltage and current.
4. Cells & Batteries
Identify terminals, measure voltage, charge/discharge, test readiness, types and specifications.
5. AC & DC measurements
Use multimeter, CRO/DSO, and function generator to measure and observe electrical parameters; learn meter types, controls, and maintenance
6. Digital Storage Oscilloscope
Identify controls, measure signal parameters, print signals, and build/test function generator; learn features and applications of DSO and CRO.
7. Soldering/ De-soldering and Various Switches
Practice soldering/de-soldering, repair PCB tracks, identify and use various switches, and make switch panel boards.
8. Active and Passive Components
Identify and test resistors, inductors, capacitors, relays, and circuit breakers; Ohm’s and Kirchhoff’s laws; RC circuits and resonance circuits.
9. Power Supply Circuits
Test diodes and transformers; build and test rectifiers; measure ripple; voltage regulators; transformer types and diode basics.
10. IC Regulators
Test diodes and transformers, build and test rectifiers and voltage regulators, measure ripple and regulation. Construct fixed and variable IC-based voltage regulators (78/79 series, LM317T, IC723). diode biasing, transformer types, rectifier efficiency, and regulator principles.
11. Transistor
Identify and test transistors, understand construction and terminals, learn biasing, characteristics, and applications as switches and amplifiers.
12. Amplifier
Build and test various transistor amplifiers (fixed, emitter, voltage divider bias, common emitter, collector, biasing, configurations, characteristics, gain, and feedback.
13. Oscillators
Build and test Colpitts, Hartley, RC phase shift, and crystal oscillators; demonstrate astable, monostable, and bistable multivibrators; understand positive feedback.
14. Wave shaping circuits
Build and test shunt, series, dual clippers, clampers, and Zener diode peak clippers;
15. Power Electronic Components
Identify power components; build and test FET amplifiers, SCR circuits, TRIAC dimmers, and UJT oscillators;, terminals, and applications.
16. MOSFET & IGBT
Identify and test MOSFETs and IGBTs, characteristics, switching speed, and differences from FETs and transistors.
17. Opto Electronics
Test LEDs, circuits with photovoltaic cells, photodiodes, and phototransistors; characteristics and applications of optical sensors and opto-isolators.
18. Basic Gates
truth tables of logic gates; build gates using NAND/NOR; test digital ICs; learn digital basics and number systems.
19. Combinational Circuits:
Build and test adders, subtractors, decoders, encoders, multiplexers, and demultiplexers.
20. Flip Flops:
Identify and test various flip-flop ICs (RS, D, T, JK), latches, and understand timing and applications.
21. Op-Amp & Timer 555 Applications:
Test analog ICs, Op-Amp circuits (amplifiers, integrators, comparators), and construct timer 555 circuits (astable, monostable, VCO, PWM).
22. Electronic Cables & Connectors
Types of cables/connectors, soldering, testing, and PC/network cable setups.
23. Basic SMD (2, 3, 4 terminal components)
Identify, de-solder, and solder 2, 3, 4 terminal SMD parts; check PCB continuity; find loose solder and broken tracks. Learn SMD advantages, reflow soldering, hardware selection, and inspection.
24. SMD Soldering and De-soldering
Set up SMD soldering station, use crimping tools for various IC packages, solder/de-solder ICs, rework defective components, inspect solder quality, and understand SMT equipment like pick-and place machines and reflow ovens.
25. PCB Rework
Inspect, test, and repair single and double-layer PCBs. Detect solder joint defects, fix damaged tracks, pads, and solder masks. Learn ESD prevention and non-soldering interconnections.
26. Protection devices
Identify types of fuses, holders, MCBs, ELCBs, contactors, and relays; understand fuse ratings and working voltages. Test MCBs, ELCBs, DC motors, and stepper motors; understand motor control and protection devices.
27. Communication electronics
Practice AM/FM modulation and demodulation, test transmitters/receivers, study antennas, modulation types, and digital signal techniques.
28. Microcontroller (8051)
Identify ICs, configure ports, blink LEDs, use timers, write simple programs. Learn architecture, memory, registers, and compare 8051/8052. Intro to PIC.
29. Sensors, Transducers used in IoT Applications
Identify and use sensors (temperature, proximity, load cells). Measure and detect signals. Basics of transducers. Connect and program microcontroller (LED, buzzer, sensors). Intro to IoT and smart systems.
30. Analog IC Applications
Build simple projects using ICs 741, 723, 555, 7106, 7107.
Examples: laptop protector, battery monitor, metal detector, smoke detector, water level controller, etc.
Focus on component use and IC data. (45 Hrs practical + 9 Hrs discussion)
31. Digital IC Applications
32. Fiber optic communication
33. Digital panel Meter
Use LED/LCD displays with driver ICs to show text and measure current.
Learn seven-segment displays, multiplexing, and DPM ICs.
34. SMPS and Inverter
Identify, dismantle, test, troubleshoot, repair, install SMPS and inverters.
Build/test DC-DC converters. Learn working principles.
35. UPS
Connect and test battery and load; identify UPS components and circuits; monitor voltages; perform backup load test. UPS types, principles, specs, installation, and protections.
36. Solar Power (Renewable Energy System)
Wire solar controller, connect batteries & inverter, test solar panel with load, install solar inverter, measure charging time. Learn solar energy principles, PV cells, modules, systems, controllers, and safety.
37. LED Lights
Identify and connect LED stacks and circuits. Series/parallel LED strings and matrix. Test voltages.
LED panel types and driving.
38. LCD and LED TV
Identify, dismantle, troubleshoot, repair, and test TVs and remotes.
Connect external devices. Learn basics of TV types, interfaces, and remotes.
IT/Computer :
1. Digital Logic.
2. Computer Organization and Architecture.
3. Programming and Data Structures.
4. Algorithms.
5. Theory of Computation.
6. Compiler Design.
7. Operating System.
8. Databases.
9. Information Systems and Software Engineering.
10. Computer Networks.
11. Web technologies.
Electrician :
1. Safety measures involved in the industry
2. Hand Tools
3. Fundamentals of Electricity
4. Wires, Joints and Soldering
5. Chemical Effects of Electric Current
6. Magnetism
7. D.C. Generators
8. D.C. Motors
9. Earthing
10. Alternating Current
11. Transformers
12. Alternator
13. Electrical Measuring Instruments
14. Illumination
15. AC Motor
16. Basic Electronics
17. Electrical Wiring
ISRO SAC Technician B Exam Pattern 2026
Duration : 90 Minutes
Negative Marking : 0.33
| S.No | Subject | No.of Question | Marks |
| 1 | Technical Subject | 80 | 80 |
| Total | 80 | 80 |
ISRO SAC Exam Date 2026 : 30th July 2026
Starting Date of Application Form : 24th October 2025
Last Date of Application Form : 13th November 2025
Total Post : 55
ISRO SAC Technician B Exam Free Online Test Series
Crack ISRO SAC Technician B exam 2026 with the help of Online Mock test Series or Free Mock Test. Every Sample Paper in ISRO SAC Technician B Exam has a designated weightage so do not miss out any Paper. Preprare and Practice Mock for ISRO SAC exam and check your test scores.
1
ISRO SAC Technician B Exam (Electronics Mechanic) - English80 questions • 90 mins • 80 marks
Free Test →ISRO SAC Technician B Exam Free Online Question Bank
ISRO SAC Technician B question answer with solutions are available in Hindi & English. Join MCQ, Important Questions, Question Bank, questions and answers for Free ISRO SAC Technician B exam preparation.
1
ISRO SAC Technician B Exam (Electronics Mechanic) - English80 questions • 90 mins • 80 marks
Free Questions →2
ISRO SAC Technician B Exam (IT/Computer) - English80 questions • 90 mins • 80 marks
Free Questions →Combo Offers
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FAQs
ISRO Sac Technician B 2026 Free Mock Test Frequently Asked Questions (FAQ's)
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