100+ Free ITI/NCVT Tool & Die Maker (AITT Theory) Practice Questions

Pass your DGT/NCVT Craftsmen Training Scheme — Tool and Die Maker (Job role: Tool and Die Maker, NCO 7222.0200/7222.0300) All India Trade Test Trade Theory exam on the first try — instant access, no signup required.

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Sample ITI/NCVT Tool & Die Maker (AITT Theory) Practice Questions

Try these sample questions to test your ITI/NCVT Tool & Die Maker (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 type of fire extinguisher is specifically recommended for extinguishing electrical fires on machine tools in a tool room?

A.Water-filled fire extinguisher

B.Carbon Dioxide (CO2) fire extinguisher

C.Foam-type fire extinguisher

D.Soda-acid fire extinguisher

Explanation: Carbon dioxide (CO2) fire extinguishers are ideal for electrical fires because CO2 is non-conductive, leaves no residue, and will not damage sensitive electronic or electrical components of machine tools. Water-filled and foam-type extinguishers contain conductive fluids that pose electrical shock hazards, while soda-acid types are chemically corrosive.

2What is the angle of a prick punch used for positioning dividers and highlighting scribed layout lines?

A.30 degrees

B.60 degrees

C.90 degrees

D.120 degrees

Explanation: A prick punch has an angle of 30 degrees, which creates a narrow, deep point suitable for locating the legs of dividers during layout operations. A 60-degree punch is a dot punch used for witness marks, and a 90-degree punch is a center punch used to create starting points for drilling.

3What is the least count of a standard metric vernier caliper where 49 main scale divisions are divided into 50 vernier scale divisions?

A.0.01 mm

B.0.02 mm

C.0.05 mm

D.0.10 mm

Explanation: The least count is calculated as 1 Main Scale Division (MSD) minus 1 Vernier Scale Division (VSD). Here, 1 MSD = 1 mm. 50 VSD = 49 MSD = 49 mm, which means 1 VSD = 49/50 = 0.98 mm. Therefore, Least Count = 1 mm - 0.98 mm = 0.02 mm.

4Which grade of slip gauge (gauge block) is designated for calibration of other slip gauges in calibration laboratories?

A.Grade II

B.Grade I

C.Grade 0

D.Grade 00

Explanation: Grade 00 slip gauges are the most precise calibration grade block sets, used primarily in reference standards laboratories to calibrate other gauge blocks and high-precision reference equipment. Grade 0 is used for inspection purposes, while Grades I and II are used in toolrooms and workshop inspections respectively.

5What is the primary mechanism that causes two clean slip gauges to stick together during the wringing process?

A.Magnetic attraction

B.Molecular adhesion and atmospheric pressure

C.Electrostatic force

D.Chemical bonding of surfaces

Explanation: Wringing is the process of sliding two slip gauges together with a twisting motion, creating a thin film of air/oil displacement that joins them by molecular adhesion and atmospheric pressure. This allows multiple gauges to be combined to form a single, highly accurate dimension without stack-up error. Wringing does not clean the gauges, measure thermal expansion, or magnetize them.

6Which type of fit is obtained when the tolerance zones of the hole and the shaft overlap each other completely or partially?

A.Clearance fit

B.Interference fit

C.Transition fit

D.Shrink fit

Explanation: A transition fit occurs when the tolerance zones of the mating parts overlap, meaning that depending on the actual sizes of the assembled hole and shaft, either a clearance or an interference fit may result. Clearance fits always have the hole larger than the shaft, and interference fits always have the shaft larger than the hole.

7Why is a diamond abrasive lap used for precision lapping operations on tungsten carbide punch inserts?

A.Because diamond is the cheapest abrasive material

B.Because diamond is the only abrasive hard enough to efficiently cut tungsten carbide

C.Because diamond provides a chemical reaction that softens carbide

D.Because diamond prevents thermal expansion during lapping

Explanation: Tungsten carbide is extremely hard (often over 70 HRC equivalent) and cannot be efficiently cut or lapped by conventional abrasives like silicon carbide or aluminum oxide. Diamond is the hardest known material and is necessary to abrade and polish carbide surfaces to a mirror finish. Diamond is expensive, acts mechanically rather than chemically, and does not inherently control thermal expansion.

8Which type of scraper is best suited for removing high spots from curved or cylindrical sleeve bearing surfaces?

A.Flat scraper

B.Triangular scraper

C.Half-round scraper

D.Bull-nosed scraper

Explanation: The half-round scraper has a curved profile that matches the contour of cylindrical surfaces (like sleeve bearings and bushings), making it ideal for scraping and highlighting contact points on curved surfaces. Flat scrapers are for flat surfaces, triangular scrapers are for internal corners and small holes, and bull-nosed scrapers are for flat or large radii.

9When using a 200 mm sine bar to inspect an angle of 30 degrees, what should be the height of the slip gauge stack?

A.50 mm

B.100 mm

C.150 mm

D.173.2 mm

Explanation: The formula for a sine bar setup is sin(theta) = Height of slip gauges (H) / Length of sine bar (L). Here, sin(30) = 0.5, and L = 200 mm. Thus, H = L * sin(theta) = 200 * 0.5 = 100 mm.

10Which comparator operates on the principle of back-pressure changes caused by the restriction of air flow through a measuring nozzle?

A.Dial indicator comparator

B.Pneumatic comparator

C.Optical comparator

D.Electrical comparator

Explanation: Pneumatic comparators (such as Solex air gauges) rely on air flow and pressure changes. When the measuring nozzle is brought close to a workpiece, the gap restricts air flow, causing a change in back-pressure that is proportional to the size deviation. This change is displayed on a manometer or pressure gauge. Dial indicators are mechanical, optical comparators use light and magnification, and electrical comparators use inductance or capacitance changes.

About the ITI/NCVT Tool & Die Maker (AITT Theory) Exam

The CTS Tool and Die Maker trade trains candidates in high-precision fitting, conventional and CNC machining, and design/manufacturing of Jigs & Fixtures, Press Tools (shearing, forming, progressive dies), and Plastic Injection Moulds/casting dies. Coursework covers GD&T symbols, 3-2-1 location principle, shear clearances, sprue/runner layout, CNC programming (G/M codes), EDM operations, and heat treatment of tool steels. Successful trainees earn the National Trade Certificate (NTC) after AITT.

Assessment

Two-year CTS trade (2400 hours + 300 hours OJT/group project), NSQF Level 4, trade code DGT/1022. 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 Tool & Die Maker (AITT Theory) Exam Content Outline

10%

Safety & Precision Fitting

Workshop safety, PPE, limits/fits/tolerances (ISO), and precision measurement using verniers, micrometers, and slip gauges.

15%

Conventional Machining Operations

Lathe cutting parameters, milling methods (up/down milling), indexing head, surface and cylindrical grinding.

10%

Engineering Drawing & GD&T

Orthographic projections, assembly drawings, sectioning, Geometric Dimensioning & Tolerancing (GD&T) symbols.

15%

Jigs & Fixtures

Principles of location (3-2-1 principle), clamping devices, drill bushings, indexing fixtures, and design considerations.

20%

Press Tools & Shearing Dies

Cutting actions (blanking, piercing), clearance calculations, progressive dies, bending dies, drawing dies, and press tonnage.

15%

Dies & Moulds (Plastic & Casting)

Injection moulding die parts (core, cavity, sprue, runner, gate, ejector pins), pressure die casting dies, and cooling design.

15%

CNC Programming & EDM

CNC lathe/milling codes (G00, G01, G02, G03), part programming, and non-conventional machining (EDM, Wire Cut EDM).

How to Pass the ITI/NCVT Tool & Die Maker (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/1022. 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

Complete 500+ practice questions
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ITI/NCVT Tool & Die Maker (AITT Theory) Study Tips from Top Performers

1Practice calculations for blanking/piercing shear force: Force = Perimeter x Thickness x Shear Strength.

2Understand injection moulding die structures, especially the function of the sprue, runners (balanced vs unbalanced), gates, and cooling channels.

3Review ISO tolerances and symbols for fit (e.g., H7/g6 clearance fit) and GD&T characteristics (flatness, cylindricity, position).

Frequently Asked Questions

What are Jigs and Fixtures in tool making?

A jig is a tooling device that holds, supports, and locates a workpiece and guides a cutting tool (e.g., drill jig with bushings). A fixture holds and locates the workpiece but does not guide the tool (e.g., milling fixture).

What is the 3-2-1 location principle?

It is a locating method that restricts nine of the twelve degrees of freedom of a workpiece by using three locators in the primary plane, two in the secondary plane, and one in the tertiary plane.

What is the difference between blanking and piercing in press tools?

In blanking, the cut-out piece is the useful part (the blank). In piercing, the cut-out piece is scrap (producing a hole in the parent sheet).

100+ Free ITI/NCVT Tool & Die Maker (AITT Theory) Practice Questions

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