100+ Free ITI/NCVT Sheet Metal Worker (AITT Theory) Practice Questions

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Sample ITI/NCVT Sheet Metal Worker (AITT Theory) Practice Questions

Try these sample questions to test your ITI/NCVT Sheet Metal Worker (AITT Theory) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which of the following personal protective equipment (PPE) is most essential to prevent severe cuts when handling raw sheet metal plates in a workshop?

A.Heavy leather gloves

B.Thin nitrile gloves

C.Polyester knit gloves

D.Rubber coated gardening gloves

Explanation: Heavy leather gloves are highly resistant to cuts and punctures, making them the standard safety requirement for handling raw, sharp sheet metal edges. Nitrile, polyester, or rubber-coated gardening gloves lack the structural integrity and thickness needed to protect hands from the slicing action of sheet metal.

2What type of fire extinguisher is specifically recommended for extinguishing fires involving electrical installations and wiring in a sheet metal workshop?

A.Carbon dioxide (CO2) extinguisher

B.Water-type fire extinguisher

C.Foam-type fire extinguisher

D.Wet chemical fire extinguisher

Explanation: Carbon dioxide (CO2) extinguishers are non-conductive and leave no residue, making them ideal for electrical (Class C in some systems, Class E in others) fires. Water and foam extinguishers conduct electricity and can cause severe shock, while wet chemical extinguishers are designed for hot kitchen fats and are not suitable for electrical panels.

3Why is a wooden or bossing mallet preferred over a steel hammer when flattening or forming sheet metal components?

A.To prevent stretching the metal and leaving tool marks or dents

B.To allow the worker to strike with greater force

C.To speed up the hardening process of the metal

D.To reduce the noise level in the workshop

Explanation: Wooden or bossing mallets have a softer contact face that distributes force, allowing sheet metal to be flattened or shaped without localized stretching, thinning, or marking the surface. A steel hammer will dent, stretch, and work-harden thin sheets, altering their thickness and dimensions undesirably.

4Which type of hand snips is designed specifically for cutting straight lines in sheet metal up to 1.2 mm thickness?

A.Straight snips

B.Bent snips

C.Aviation left-cut snips

D.Circle snips

Explanation: Straight snips have straight blades designed for making linear cuts along a scribed line on flat sheets. Bent snips are offset to keep the worker's hand above the metal when cutting curves, while aviation left-cut snips are compound-lever tools designed for cutting curves to the left.

5What is the primary function of bent snips in a sheet metal shop?

A.Cutting along circular or curved layout lines

B.Cutting thick structural angle iron sections

C.Making deep notched cutouts in heavy plates

D.Splitting steel pipes longitudinally

Explanation: Bent snips feature curved cutting blades and angled handles that raise the user's hand away from the metal plate. This geometry allows the blades to easily follow curved layout lines, circles, and arcs without binding or tearing the metal. They are not intended for heavy plate, structural shapes, or pipe splitting.

6Which tool is used to align matching holes in two overlapping sheet metal pieces prior to inserting a rivet?

A.Drift pin

B.Center punch

C.Prick punch

D.Scriber

Explanation: A drift pin (or drift) is a tapered steel tool inserted into mismatched holes in overlapping sheets. Tapping the drift pin forces the sheets to slide until their holes align perfectly, allowing the rivet to be inserted easily. Punches are used to mark positions, and scribers are used for marking lines.

7What is the key structural feature and application of a cross-peen hammer in sheet metal work?

A.The peen is wedge-shaped and runs perpendicular to the handle; used for bending and stretching metal in one direction

B.The peen is spherical; used for heavy-duty riveting and punching holes

C.The peen is wedge-shaped and runs parallel to the handle; used for setting flat rivets

D.The face is made of soft lead; used for planishing curved panels

Explanation: A cross-peen hammer has a wedge-shaped peen oriented at right angles (perpendicular) to the handle. This design allows the worker to concentrate force along a narrow line, making it highly effective for bending edges, forming profiles, and stretching metal along a single axis. Straight-peen hammers have the wedge parallel to the handle.

8Which grade and type of file is best suited for quickly removing stock and finishing soft metals like aluminum and lead without clogging the teeth?

A.Curved-cut (Vixen) file

B.Double-cut smooth file

C.Single-cut bastard file

D.Dead-smooth mill file

Explanation: Curved-cut files, often referred to as Vixen files, have large, curved teeth that cut rapidly and are self-cleaning. This prevents soft, ductile metals like aluminum, copper, and lead from clogging (pinning) the teeth. Double-cut and fine single-cut files clog rapidly when used on soft metals.

9Which hand tool is specifically designed for cutting internal circular holes or tight curved slots starting from a pre-drilled pilot hole?

A.Circular (aviation curve) snips

B.Straight snips

C.Standard hacksaw

D.Cold chisel

Explanation: Circular or aviation curve snips have narrow, curved blades and a compound action that enables them to fit inside a relatively small pilot hole and cut tight, continuous curves or circles. Straight snips are too wide to turn within a small radius, hacksaws cannot cut curves, and chisels distort the metal around the cut.

10What is the recommended cutting edge angle of a flat cold chisel when used for cutting general-purpose mild steel sheets?

A.60 degrees

B.30 degrees

C.80 degrees

D.45 degrees

Explanation: A cutting edge angle of 60 degrees provides the ideal balance between sharpness and mechanical strength for a cold chisel working on mild steel. A smaller angle (like 30 or 45 degrees) would dull or chip rapidly, while a larger angle (like 80 degrees) is meant for extremely hard metals and requires excessive force to cut mild steel.

About the ITI/NCVT Sheet Metal Worker (AITT Theory) Exam

The CTS Sheet Metal Worker trade trains candidates in cutting, bending, forming, and joining sheet metal of various materials and thicknesses (gauges). Coursework includes blueprint reading, pattern layout development (parallel line, radial line, triangulation), folding machines and hand stakes operations, seaming (grooved seams, Pittsburgh locks), riveting, soft soldering, silver brazing, and gas/arc/spot welding. Successful trainees earn the National Trade Certificate (NTC) after AITT.

Assessment

One-year CTS trade (1200 hours + 150 hours OJT/group project), NSQF Level 3, trade code DGT/1025. 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 Fee

CBT fee ₹213 per trainee for AITT July 2026 mains (plus applicable payment-gateway charges). Practical fees are separate — confirm with your ITI. (Directorate General of Training (DGT), Ministry of Skill Development and Entrepreneurship)

ITI/NCVT Sheet Metal Worker (AITT Theory) Exam Content Outline

10%

Safety & Hand Tools

Workshop safety, protective gear, snips, stakes (funnel, beak-iron, half-moon), hammers, mallets, punches, and chisels.

15%

Measuring & Marking Instruments

Steel rules, micrometers, vernier calipers, steel squares, wing compasses, dividers, and trammels.

15%

Sheet Metal Properties & Gauges

Ferrous and non-ferrous sheets, Standard Wire Gauge (SWG) thickness, physical properties of steel, brass, copper, and aluminum.

25%

Layout & Surface Development

Development of templates, parallel line development (prisms, cylinders), radial line development (cones, pyramids), and triangulation methods.

20%

Forming, Seaming & Folding Operations

Shearing, folding, bending, beading, channeling. Types of joints and seams (lap, grooved, pan, double, Pittsburgh lock).

15%

Joining Methods: Riveting, Soldering & Welding

Rivets and riveting tools, soft and hard soldering, brazing fluxes, and gas/arc/resistance spot welding on sheets.

How to Pass the ITI/NCVT Sheet Metal Worker (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: One-year CTS trade (1200 hours + 150 hours OJT/group project), NSQF Level 3, trade code DGT/1025. 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 fee: CBT fee ₹213 per trainee for AITT July 2026 mains (plus applicable payment-gateway charges). Practical fees are separate — confirm with your ITI.

Keys to Passing

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Focus on highest-weighted sections
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ITI/NCVT Sheet Metal Worker (AITT Theory) Study Tips from Top Performers

1Study layout calculations for bend allowances and seam allowances (e.g. grooved seam requires adding 1.5 to 3 times the seam width).

2Understand the difference between parallel line development (used for ducts, elbows, cylinders) and radial line development (used for funnels, transitions).

3Know the types of rivets (snap head, pan head, counter-sunk) and the causes of riveting defects (cracked heads, sheet buckling).

Frequently Asked Questions

What is the standard wire gauge (SWG) range for sheet metal?

In ITI terminology, sheet metal typically refers to metal with a thickness from 8 SWG (approx 4.06 mm) down to 30 SWG (approx 0.31 mm). Anything thicker is considered plate.

What are folding stakes and how are they used?

Stakes are sheet metal anvils used for folding, seaming, and forming shapes by hand. Examples include the beak-iron (for cones), pipe stake (for tubes), and half-moon stake (for flanging circular edges).

How are conical shapes developed in pattern layouts?

Conical and pyramidal shapes are developed using the radial line development method, where the layout is drawn from a single focal apex point.

100+ Free ITI/NCVT Sheet Metal Worker (AITT Theory) Practice Questions

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