100+ Free ITI Solar Technician Electrical (AITT Theory) Practice Questions

Pass your ITI/NCVT Solar Technician (Electrical) — All India Trade Test (AITT) Theory under Craftsmen Training Scheme (CTS) exam on the first try — instant access, no signup required.

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Sample ITI Solar Technician Electrical (AITT Theory) Practice Questions

Try these sample questions to test your ITI Solar Technician Electrical (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 ITI solar workshop, which class of fire extinguisher is appropriate for an energised electrical panel fire?

A.CO2 or dry-chemical extinguisher rated for electrical fires

B.Class A water extinguisher

C.Foam extinguisher designed only for Class B liquid fuels

D.Class D extinguisher for combustible metals

Explanation: Energised electrical fires require non-conductive agents such as CO2 or dry chemical. Water and ordinary foam can create shock and spread risk on live equipment.

2Which personal protective equipment is most appropriate when handling lead-acid solar batteries during electrolyte checks?

A.Cotton gloves only, with no eye protection

B.Acid-resistant gloves, safety goggles or face shield, and apron

C.Insulated rubber gloves rated only for HV live-line work

D.Hearing protection only

Explanation: Lead-acid electrolyte is corrosive. Acid-resistant gloves, eye/face protection and an apron reduce chemical injury risk during specific-gravity checks and topping up.

3Under common industrial safety-sign conventions used in ITI workshops, a blue circular sign typically indicates:

A.A prohibition such as 'no smoking'

B.A safe-condition or first-aid location only

C.A mandatory action such as required PPE

D.A warning of a falling-object hazard

Explanation: Blue circular signs convey mandatory actions (for example, wear eye protection). Red often prohibits; yellow warns; green indicates safe condition/first aid.

4Before working on a DC solar array string, the safest first step is to:

A.Short the positive and negative MC4 connectors together to discharge the array

B.Spray water on the modules to stop generation

C.Remove only the inverter AC fuse and leave DC connected

D.Isolate the array at the DC isolator/combiner and verify zero voltage with a suitable meter

Explanation: Safe isolation means opening the DC isolator/combiner path and verifying absence of voltage with an appropriately rated meter before handling conductors.

5Used lead-acid solar batteries at end of life should be:

A.Sent through an authorised recycler/hazardous-waste channel

B.Buried on site to avoid transport cost

C.Thrown into general municipal mixed waste

D.Drained into a storm-water drain then discarded

Explanation: Spent lead-acid batteries are hazardous waste. Authorised recycling recovers lead and acid safely and is the required disposal route in the CTS syllabus.

6Which tool is used to measure earth-electrode resistance during earthing checks in the Solar Technician trade?

A.Clip-on tong tester only

B.Earth tester (or Megger earth-resistance mode)

C.Spirit level

D.Clinometer

Explanation: An earth tester (or insulation tester with earth-resistance function) measures electrode resistance. Tong testers measure current; spirit levels and clinometers are for alignment/angle.

7Elementary first aid for a minor acid splash to the skin from battery electrolyte should begin with:

A.Neutralising with undiluted alkali on the skin immediately

B.Covering with grease to seal the burn

C.Prolonged flushing with plenty of clean water and seeking medical advice if needed

D.Ignoring it if pain is mild

Explanation: Immediate dilution by flushing with clean water is the standard first response for minor acid splash. Do not apply strong alkali to skin; seek further care if irritation persists.

8Which statement about ladder/scaffold work while installing rooftop PV modules is correct?

A.Metal ladders may be leant directly on live overhead lines if modules are off

B.Tools may be thrown up to the roof to save climbing trips

C.PPE is optional above 3 m if the weather is calm

D.Three-point contact, stable footing and fall protection where required are essential

Explanation: Working at height for rooftop PV requires stable access, three-point contact on ladders and appropriate fall protection. Never throw tools or ignore PPE.

9Ohm's law states that for a metallic conductor at constant temperature:

A.V = I × R

B.V = I / R

C.P = V / I

D.R = V × I

Explanation: Ohm's law: voltage V equals current I times resistance R (V = IR). Power is typically P = VI or I²R.

10In a series DC circuit with three resistors, the current through each resistor is:

A.Different and proportional only to resistance

B.The same through each resistor

C.Zero in the middle resistor

D.Inversely proportional to supply voltage only

Explanation: Series connection shares one path, so the same current flows through each resistor. Voltage divides across resistances.

About the ITI Solar Technician Electrical (AITT Theory) Exam

Solar Technician (Electrical) is a one-year engineering CTS trade delivered through ITIs. Trainees learn workshop safety, basic electricity, solar radiation measurement, PV cells/modules, batteries and charge controllers, solar DC appliances, inverters/PCUs, installation and commissioning of PV and hybrid plants, IEC-related module tests, O&M best practices, and bills of materials for solar products. AITT theory CBT plus practical assessment lead to the NTC.

Assessment

Summative AITT under DGT/NCVT for the one-year CTS Solar Technician (Electrical) engineering trade (NSQF Level 3/3.5 revisions; 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 Solar Technician Electrical (AITT Theory) Exam Content Outline

Workshop Safety & Tools

OSH, electrical fire extinguishers, battery PPE, DC isolation and earthing tools.

12%

Electrical Fundamentals

Ohm's law, circuits, MC4s, protection devices, soldering/crimping and instruments.

Solar Radiation Fundamentals

GHI/DNI, pyranometers, shading, tilt/orientation and AM1.5/STC concepts.

12%

PV Modules & Characteristics

STC, I–V/MPP, cell types, Voc/Isc, diodes, temperature and array wiring.

Batteries & Storage

Ah, SOC/DoD, hydrometer, series/parallel banks and maintenance.

Charge Controllers

PWM vs MPPT, blocking diodes and LVD protection.

Solar DC Appliances

Home lighting, street lights, lanterns and DC pumps.

10%

Inverters & Hybrid Systems

PCU/inverters, anti-islanding, AJB, cables and SPDs.

16%

Installation & Commissioning

Site survey, mounts, earthing, polarity and commissioning checks.

PV Testing & IEC Standards

IEC 61730, hot spots and module diagnostic tests.

Operation & Maintenance

Cleaning, structures, inverter/JB service and SOPs.

BOM & Solar Products

Project BOMs, module assembly and product commissioning.

How to Pass the ITI Solar Technician Electrical (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 Solar Technician (Electrical) engineering trade (NSQF Level 3/3.5 revisions; 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 Solar Technician Electrical (AITT Theory) Study Tips from Top Performers

1Map revision to CTS learning outcomes with heavy professional-knowledge hours: PV modules/batteries/controllers, installation & commissioning, inverters/PCUs and electrical fundamentals.

2Practice CBT-style timing with mixed sets; remember WSC and Engineering Drawing items sit inside the Trade Theory block on the real 75-question paper.

3Pair theory with workshop practice — MC4 crimping, series/parallel array measurements, PWM vs MPPT comparisons, earth testing and module I–V checks — because formative and practical assessments still require 60%.

Frequently Asked Questions

What is the ITI/NCVT Solar Technician (Electrical) AITT theory exam?

It is the All India Trade Test theory CBT administered by DGT for trainees completing the one-year CTS Solar Technician (Electrical) 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 Solar Technician (Electrical) 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.