100+ Free ITI Mechanic Auto Electrical & Electronics (AITT Theory) Practice Questions

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Sample ITI Mechanic Auto Electrical & Electronics (AITT Theory) Practice Questions

Try these sample questions to test your ITI Mechanic Auto Electrical & Electronics (AITT Theory) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In an automotive workshop, which fire extinguisher class is appropriate for a fuel-spillage petrol fire?

A.Class B (foam/CO2/dry chemical) extinguisher

B.Class A water extinguisher only

C.Class C extinguisher for flammable-gas fires only

D.Class D for combustible metals only

Explanation: Petrol and other flammable liquid fires are Class B under Indian fire-class conventions (IS 2190). Foam, CO2 or dry-chemical extinguishers starve or smother liquid-fuel flames. Water (Class A) can spread burning petrol and must not be used on fuel spills.

2Which safety sign colour typically indicates a mandatory personal-protection requirement in the workshop?

A.Yellow and black for mandatory PPE

B.Blue circular signs for mandatory actions such as PPE

C.Green square for mandatory PPE only

D.Red triangle for mandatory PPE

Explanation: Under common industrial safety-sign conventions (ISO 7010 style), mandatory actions including required PPE use a blue circular sign. Yellow and black warn of hazards; red prohibits or indicates fire equipment.

3Used engine oil in an ITI auto workshop should be disposed of by:

A.Pouring it into a storm-water drain

B.Burning it openly in the yard

C.Collecting it for authorised recycling or disposal as hazardous waste

D.Mixing it with coolant and discarding as general rubbish

Explanation: Used engine oil is hazardous waste. Collecting it for authorised recycling or disposal protects groundwater and complies with environmental and workshop safety rules.

4A centre punch is primarily used to:

A.Measure inside diameters of bores

B.Cut external threads on a bolt

C.Check flatness of a surface plate

D.Mark a starting point for drilling so the bit does not wander

Explanation: A centre punch makes a conical indentation that locates and guides a twist drill. Without it, the drill tends to walk on the surface. It is a marking tool, not a measuring, threading or flatness tool.

5Which measuring instrument is most suitable for checking the outside diameter of a valve stem to 0.01 mm precision?

A.Outside micrometer

B.Steel rule

C.Feeler gauge alone

D.Try square

Explanation: An outside micrometer is a precision instrument designed for accurate external diameter measurement, typically reading to 0.01 mm or finer. Steel rules lack that resolution; feeler gauges measure gaps; try squares check squareness.

6A lock washer under a nut is used mainly to:

A.Increase thread pitch permanently

B.Resist loosening from vibration

C.Seal oil pressure in a gallery

D.Act as a bearing race

Explanation: Lock washers and similar locking devices add friction or spring tension so nuts resist vibration-induced loosening on vehicles. They do not change thread pitch, seal galleries or serve as bearings.

7When selecting a tap-drill size for a metric thread, the drill diameter should generally be approximately:

A.Equal to the major outside diameter of the bolt

B.Twice the major diameter

C.Approximately the minor (root) diameter of the internal thread

D.Half the pitch only, ignoring diameter

Explanation: A tap-drill hole is sized near the minor diameter (rule of thumb: major diameter minus pitch for metric) so the tap can form full-height internal threads without excessive torque. Drilling to the major diameter would leave no material for threads.

8Phillips and blade flat screwdrivers differ mainly in:

A.The voltage rating stamped on the handle

B.Being usable only on metric or only on imperial fasteners

C.The hardness of the shaft steel only

D.Their tip shape matching different screw-head recesses

Explanation: Blade tips fit slotted heads; Phillips tips fit cruciform recesses. Using the wrong tip damages the fastener and tool. Tip geometry, not voltage, unit system, or shaft hardness alone, is the primary distinction.

9Limits, fits and tolerances in auto components describe:

A.Permitted size variation and how mating parts assemble as clearance, transition or interference

B.Only the colour of paint on parts

C.Only the mass of the finished vehicle

D.The octane rating of fuel

Explanation: Limits define allowable maximum and minimum sizes; tolerance is the difference between those limits; fits describe how a shaft and hole relate as clearance, transition or interference. These concepts are central to workshop inspection of auto parts.

10Before grinding a chisel or centre punch on a pedestal grinder, the trainee should first:

A.Remove the eye shield to see better

B.Check wheel condition, adjust the tool rest and wear eye protection

C.Hold the tool with oily rags for grip

D.Stand directly in the plane of the rotating wheel

Explanation: Grinding safety requires a sound wheel, a correctly set tool rest, and eye protection plus face shield where required. Removing guards, using oily rags and standing in the wheel plane increase injury risk if the wheel breaks.

About the ITI Mechanic Auto Electrical & Electronics (AITT Theory) Exam

Mechanic Auto Electrical & Electronics is a one-year engineering CTS trade delivered through ITIs. Trainees learn workshop safety and fitting, basic electricity/electronics, battery service, vehicle wiring and joints, ignition, starting and charging systems, EFI/MPFI/EDC sensors and ECU diagnosis, EPS/ABS, HVAC, lighting, body electrical accessories and vehicle network buses. AITT theory CBT plus practical assessment lead to the NTC.

Assessment

Summative AITT under DGT/NCVT for the one-year CTS Mechanic Auto Electrical & Electronics trade (NSQF Level 3.5; 1200 notional hours + 150 hours OJT/group project). Engineering-trade CBT: 75 MCQs / 150 marks in 2 hours — Trade Theory 38 + Workshop Calculation & Science 6 + Engineering Drawing 6 (100 marks) and Employability Skills 25 (50 marks). Trade Practical is assessed separately; formative (internal) assessment is maintained by the ITI. Successful candidates receive the National Trade Certificate (NTC).

Time Limit

2 hours for CBT (AITT July 2026 DGT guidelines). Practical duration follows the DGT/State Directorate schedule for the sitting.

Passing Score

33% minimum in Trade Theory and in Employability Skills; 60% minimum in Trade Practical and Formative Assessment (DGT CTS pass regulation / AITT July 2026 guidelines). No grace marks.

Exam Fee

CBT fee ₹213 per trainee for AITT July 2026 mains (plus applicable payment-gateway charges). Practical and other institute fees are notified separately on SIDH — confirm with your ITI. (Directorate General of Training (DGT) / National Council for Vocational Training (NCVT))

ITI Mechanic Auto Electrical & Electronics (AITT Theory) Exam Content Outline

12%

Workshop Safety, Tools, Measurement & Fitting

OSH, tools, precision gauges, fasteners, drilling, taps/dies and fitting.

Basic Electricity & Circuit Testing

Ohm's law, series/parallel circuits, multimeters, fuses and voltage drop.

Battery Systems

Lead-acid/SMF batteries, hydrometer, charging and parasitic drain.

Basic Electronics

Diodes, transistors, MOSFETs, logic gates and connector tests.

Vehicle Specs, Engine & Dashboard

VIN/specs, SI/CI engines, gauges and service equipment.

Wiring Circuits & Electrical Components

Switches, relays, protection devices, harnesses and wiring diagrams.

Ignition Systems

Coils, plugs, sensors and distributor-less ignition.

10%

Starting & Charging Systems

Starter tests, alternator, regulator and drive-belt service.

12%

EFI, MPFI, EDC & Engine Sensors

EFI/CRDI components, ECU, sensors, DTCs and scan tools.

EPS, ABS & Transmission Electronics

Electric steering, ABS/EBD and electronic transmission sensors.

HVAC Comfort Systems

A/C circuit, compressor, gauges, heating and climate sensors.

Automotive Lighting

Headlamps, signals, brake/park lights and flasher circuits.

Accessories, Safety Systems & Vehicle Networks

Horn, wipers, windows, airbags/immobilizer and CAN/LIN buses.

Workshop Calculation, Science & Engineering Drawing

WSC numeracy/science and orthographic/isometric drawing for CBT.

How to Pass the ITI Mechanic Auto Electrical & Electronics (AITT Theory) Exam

What You Need to Know

Passing score: 33% minimum in Trade Theory and in Employability Skills; 60% minimum in Trade Practical and Formative Assessment (DGT CTS pass regulation / AITT July 2026 guidelines). No grace marks.
Assessment: Summative AITT under DGT/NCVT for the one-year CTS Mechanic Auto Electrical & Electronics trade (NSQF Level 3.5; 1200 notional hours + 150 hours OJT/group project). Engineering-trade CBT: 75 MCQs / 150 marks in 2 hours — Trade Theory 38 + Workshop Calculation & Science 6 + Engineering Drawing 6 (100 marks) and Employability Skills 25 (50 marks). Trade Practical is assessed separately; formative (internal) assessment is maintained by the ITI. Successful candidates receive the National Trade Certificate (NTC).
Time limit: 2 hours for CBT (AITT July 2026 DGT guidelines). Practical duration follows the DGT/State Directorate schedule for the sitting.
Exam fee: CBT fee ₹213 per trainee for AITT July 2026 mains (plus applicable payment-gateway charges). Practical and other institute fees are notified separately on SIDH — confirm with your ITI.

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

ITI Mechanic Auto Electrical & Electronics (AITT Theory) Study Tips from Top Performers

1Map revision to CTS learning outcomes that carry heavy professional-knowledge hours: starting/charging, EFI/MPFI/EDC sensors, lighting, HVAC and wiring diagnosis.

2Practice CBT-style timing with mixed sets that include a few Workshop Calculation & Science and Engineering Drawing items, since those 12 questions sit inside the Trade Theory block.

3Pair theory with workshop practice — multimeter voltage-drop tests, battery hydrometer checks, starter bench tests, scan-tool DTCs and headlamp aiming — because formative and practical assessments still require 60%.

Frequently Asked Questions

What is the ITI/NCVT Mechanic Auto Electrical & Electronics AITT theory exam?

It is the All India Trade Test theory CBT administered by DGT for trainees completing the one-year CTS Mechanic Auto Electrical & Electronics course at ITIs. Engineering-trade CBT covers Trade Theory (with Workshop Calculation & Science and Engineering Drawing) plus Employability Skills; a separate Trade Practical exam is also required for the National Trade Certificate.

How many questions and how much time are in the AITT CBT?

Per DGT AITT July 2026 guidelines, the CBT is 75 multiple-choice questions for 150 marks in two hours: 50 questions (100 marks) in the Trade Theory block (38 trade theory + 6 WSC + 6 engineering drawing) and 25 Employability Skills questions (50 marks).

What are the pass marks for Mechanic Auto Electrical & Electronics AITT?

DGT requires at least 33% in Trade Theory and 33% in Employability Skills, and at least 60% in Trade Practical and Formative Assessment. There are no grace marks. Confirm any session-specific notifications on the DGT exam corner or SIDH.

What is the CBT examination fee?

For AITT July 2026 mains, DGT notified a CBT fee of ₹213 per trainee (plus payment-gateway charges), payable online via SIDH. Practical fees are separate — ask your ITI for the exact amount for your sitting.