Free Practice Questions for ITI/NCVT Mechanic Consumer Electronics (AITT Theory)

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Sample ITI/NCVT Mechanic Consumer Electronics (AITT Theory) Practice Questions

Try these sample questions to review concepts for the ITI/NCVT Mechanic Consumer Electronics (AITT Theory) exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which type of fire extinguisher is recommended for extinguishing electrical fires in an electronics workshop?

A.Water-type fire extinguisher

B.Carbon Dioxide (CO2) or dry chemical powder extinguisher

C.Foam-type fire extinguisher

D.Soda-acid fire extinguisher

Explanation: Carbon dioxide (CO2) and dry chemical powder (DCP) extinguishers are non-conductive and safe for electrical fires (Class C in Indian standards, Class E in some international standards). Water and foam conduct electricity and can cause severe shock or worsen the fire. CO2 is particularly favored for electronics because it leaves no residue that could corrode circuits.

2What is the immediate first-aid step to be taken when a person receives an electric shock in the workshop?

A.Pull the victim away from the source with bare hands

B.Switch off the main power supply immediately or use an insulating material to isolate the victim

C.Pour cold water on the victim to reduce burns

D.Administer oral liquids to keep the victim hydrated

Explanation: The first priority is safety: immediately switch off the power supply or use a non-conductive object (like dry wood, plastic, or rubber) to separate the victim from the live conductor. Touching the victim directly while they are still in contact with the live current will cause the rescuer to get shocked as well. Once isolated, check breathing and begin CPR if necessary.

3What is the primary cause of a 'dry solder' joint in electronic circuit assembly?

A.Using lead-free solder wire

B.Component movement or vibration while the solder is cooling down

C.Soldering iron temperature being too high

D.Using excessive flux on the joint

Explanation: A dry joint (cold joint) occurs when the component lead or wire moves while the solder is transitioning from liquid to solid state, resulting in a fractured, dull, and mechanically weak joint with high electrical resistance. Other causes include insufficient heat or dirty leads. It can be identified by its dull, grainy appearance rather than a shiny, smooth concavity.

4Why is the tip of a professional soldering iron plated with iron and chrome over a copper core?

A.To reduce the overall weight of the soldering iron

B.To combine the high thermal conductivity of copper with the durability and oxidation resistance of iron and chrome

C.To increase the electrical resistance of the tip for direct heating

D.To allow the tip to bend easily into custom shapes

Explanation: Copper is used as the core of soldering iron tips because it has excellent thermal conductivity. However, molten solder dissolves copper rapidly, so the tip is plated with iron for durability, nickel for solder wetting, and chrome on the shank to prevent solder from climbing up. This multi-metal plating ensures rapid heat transfer while preventing the tip from corroding away quickly.

5What is the primary function of rosin flux in electronic soldering?

A.To act as an adhesive to hold the components in place permanently

B.To remove oxide films from the metal surfaces and prevent oxidation during heating

C.To lower the melting point of the solder alloy to room temperature

D.To insulate the joint and prevent short circuits after soldering

Explanation: Rosin flux melts at a lower temperature than solder and chemically cleans oxides from the copper track and component leads. This allows the molten solder to wet the surfaces properly and form a strong intermetallic bond. It also prevents new oxide layers from forming during the high temperatures of soldering.

6Which hand tool is specifically designed to remove molten solder from a PCB through-hole joint using vacuum action?

A.Desoldering wick (solder braid)

B.Desoldering pump (solder sucker)

C.Needle-nose tweezers

D.Hot air rework station

Explanation: A desoldering pump, commonly known as a solder sucker, uses a spring-loaded piston to create a sudden vacuum when released. When the nozzle is placed against a solder joint melted by a soldering iron, the vacuum sucks the molten solder into the pump chamber, leaving the lead free. This is ideal for cleaning through-holes on double-sided boards.

7In which situation is a technician most likely to use long-nose (needle-nose) pliers instead of combination pliers?

A.Cutting heavy-gauge steel armored cables

B.Gripping, bending, or reaching components in tight or confined spaces on a chassis

C.Crimping heavy-duty insulated terminal lugs

D.Peeling insulation off flat ribbon cables

Explanation: Long-nose pliers have long, slender jaws that taper to a point, making them perfect for holding, bending, and reaching wires or components in restricted spaces where fingers or combination pliers cannot fit. They also feature fine serrations at the tip for secure gripping of small parts.

8What is the main advantage of using a crimping tool to terminate wires with lugs compared to soldering them?

A.It creates a joint with higher electrical resistance to control current flow

B.It provides a fast, mechanically reliable, and vibration-resistant solderless connection

C.It allows the wire to be disconnected easily without any tools

D.It melts the metal sleeve of the lug to fuse with the copper wire

Explanation: Crimping uses mechanical pressure to deform a terminal sleeve around a stranded wire, creating a cold weld that is gas-tight and highly resistant to mechanical vibration. Soldering can make the wire brittle near the joint due to solder wicking, whereas a crimped joint remains flexible and is faster to produce in commercial applications.

9What is the composition and melting point of a standard eutectic tin-lead solder alloy used in electronics?

A.50% Tin / 50% Lead, melting range 183°C to 212°C

B.63% Tin / 37% Lead, melting sharply at 183°C

C.60% Tin / 40% Lead, melting range 183°C to 190°C

D.96.5% Tin / 3% Silver / 0.5% Copper, melting at 217°C

Explanation: A eutectic alloy has a specific composition that transitions directly from a solid to a liquid state at a single precise temperature, without a pasty (semi-solid) range. For tin-lead, this is 63% tin and 37% lead, which melts sharply at 183°C (361°F). The absence of a pasty state reduces the chance of dry joints due to component movement during cooling.

10To which point should an Electrostatic Discharge (ESD) safety wrist strap be connected to protect sensitive MOSFETs during repair?

A.The mains neutral wire of the workshop power socket

B.A verified electrical ground (earth) point through a 1-Megohm current-limiting safety resistor

C.The positive terminal of the circuit board's DC power supply

D.Any unpainted plastic chassis surface of the appliance being repaired

Explanation: An ESD wrist strap bleeds static charges from the technician's body safely to the earth ground. It must be connected to an earth ground through a 1-Megohm resistor. This resistor is critical for safety: it limits any current flowing through the technician to a safe level (less than 0.5mA at 240V) in case they accidentally touch live AC power.

About the ITI/NCVT Mechanic Consumer Electronics (AITT Theory) Exam

The CTS Mechanic Consumer Electronics Appliances trade trains candidates to diagnose, service, and repair domestic electronic devices and appliances. Coursework spans basic electricity, active/passive electronic components, power supply systems (SMPS, UPS, inverters), digital circuits, microcontrollers, audio equipment, LCD/LED TV systems, CCTV networks, fiber optics, and home appliance maintenance (microwaves, induction cooktops). Successful trainees earn the National Trade Certificate (NTC) after AITT.

Exam sponsor: Directorate General of Training (DGT), Ministry of Skill Development and Entrepreneurship. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Two-year CTS trade (2400 hours + 300 hours OJT/group project), NSQF Level 4, trade code DGT/1054. Summative AITT includes Trade Practical plus Computer-Based Test. Engineering-trade CBT: 75 questions / 150 marks / 2 hours covering Trade Theory (with Workshop Science & Calculation and Engineering Drawing items) and Employability Skills.

Time Limit

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

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 / Certification Fees

CBT fee ₹213 per trainee for AITT July 2026 mains (plus applicable payment-gateway charges). Practical fees are separate — confirm with your ITI.

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

10%

Safety, Hand Tools & Soldering

Workshop safety, PPE, ESD prevention, soldering/desoldering techniques, SMD rework, and hand tools.

15%

Basic Electricity & Electronics

Ohm's law, AC/DC, passive components (resistors, inductors, capacitors), active components (diodes, transistors, FETs, SCRs).

15%

Power Supplies & Regulators

Rectifiers, filters, linear and switched-mode power supplies (SMPS), UPS, inverters, and battery charger circuits.

15%

Digital Electronics & Microprocessors

Logic gates, combinational and sequential circuits, ADC/DAC converters, microcontrollers, and basic programming.

20%

Audio & Video Systems

Microphones, speakers, amplifiers, PA systems, LCD/LED TV architecture, display panels, and troubleshooting.

15%

Home Appliances & Security Systems

Microwave ovens, washing machines, solar panels, CCTV camera installation, DVR configuration, and fiber optic cabling.

10%

Test Equipment & Diagnostics

Operation of multimeters, oscilloscopes, signal generators, logic probes, and diagnostic workflows.

Preparing for the ITI/NCVT Mechanic Consumer 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: Two-year CTS trade (2400 hours + 300 hours OJT/group project), NSQF Level 4, trade code DGT/1054. Summative AITT includes Trade Practical plus Computer-Based Test. Engineering-trade CBT: 75 questions / 150 marks / 2 hours covering Trade Theory (with Workshop Science & Calculation and Engineering Drawing items) and Employability Skills.
Time limit: 2 hours for CBT (AITT July 2026 DGT guidelines). Practical duration follows the DGT/State Directorate schedule.
Exam / certification fees: CBT fee ₹213 per trainee for AITT July 2026 mains (plus applicable payment-gateway charges). Practical fees are separate — confirm with your ITI. Official sources

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ITI/NCVT Mechanic Consumer Electronics (AITT Theory): Suggested Study Strategy

1Familiarize yourself with logic gate truth tables, binary conversions, and basic microcontroller pin configurations.

2Study SMPS and linear regulator block diagrams and common fault scenarios (such as diode shorting or capacitor failure).

3Pay attention to display panel troubleshooting steps (backlight faults, T-Con board diagnostics) for LCD/LED TVs.

Frequently Asked Questions

What is the duration of the ITI Mechanic Consumer Electronics course?

It is a two-year Engineering trade under the Craftsmen Training Scheme (CTS) of the Directorate General of Training (DGT).

What is the pass criteria for the Consumer Electronics AITT exam?

A minimum of 33% is required in both Trade Theory (CBT) and Employability Skills, and 60% in Trade Practical and Formative Assessment.

Does the exam cover CCTV and security systems?

Yes, CCTV camera installation, digital video recorder (DVR) settings, and fiber optic networking are parts of the second-year CTS syllabus.

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