100+ Free ITI/NCVT Mechanic Machine Tool Maintenance (AITT Theory) Practice Questions

Pass your DGT/NCVT Craftsmen Training Scheme — Mechanic Machine Tool Maintenance (MMTM) (Job role: Machine Tool Maintenance Mechanic, NCO 7233.0100) All India Trade Test Trade Theory exam on the first try — instant access, no signup required.

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Sample ITI/NCVT Mechanic Machine Tool Maintenance (AITT Theory) Practice Questions

Try these sample questions to test your ITI/NCVT Mechanic Machine Tool Maintenance (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 must be used to extinguish electrical fires on machine tools safely and without leaving conductive residue?

A.Soda acid fire extinguisher

B.Foam type fire extinguisher

C.Carbon dioxide (CO2) fire extinguisher

D.Water jet fire extinguisher

Explanation: Carbon dioxide (CO2) fire extinguishers are non-conductive, non-corrosive, and do not leave any residue, making them ideal for electrical fires on sensitive machine tool controls. Other options like water, soda acid, and foam contain moisture that can cause electric shocks to the operator and permanently damage the machine's electrical circuits.

2What is the recommended category of Personal Protective Equipment (PPE) and standard practice when performing spindle maintenance on a running lathe machine?

A.Wear loose leather gloves to protect fingers from hot chips

B.Do not wear gloves, loose clothing, or jewelry, and tie back long hair

C.Wear a thick cotton apron with loose ties for chest protection

D.Wear heavy-duty rubber gloves for vibration damping

Explanation: When working around rotating machinery like lathe spindles, wearing gloves, loose clothing, or jewelry is strictly prohibited because they can easily get caught in the rotating spindle, lead screw, or chuck, pulling the operator's limbs into the machine. Hair must be tied back, and tight-fitting work clothes must be worn for maximum safety.

3How is the least count of a metric Vernier caliper calculated if the main scale has 1 mm divisions and the Vernier scale has 50 divisions matching 49 main scale divisions?

A.0.05 mm

B.0.02 mm

C.0.01 mm

D.0.10 mm

Explanation: The least count (LC) of a Vernier caliper is calculated as: 1 Main Scale Division (MSD) - 1 Vernier Scale Division (VSD). Here, 1 MSD = 1 mm. Since 50 Vernier divisions equal 49 mm, 1 VSD = 49/50 mm = 0.98 mm. Therefore, LC = 1 mm - 0.98 mm = 0.02 mm.

4What is the correct procedure to calculate the final reading on a metric outside micrometer (range 25-50 mm) when the barrel shows 38.5 mm and the thimble coincides with the 24th division?

A.38.5 + 24 = 62.50 mm

B.38.50 + 0.24 = 38.74 mm

C.25.00 + 38.50 + 0.24 = 63.74 mm

D.38.00 + 0.24 = 38.24 mm

Explanation: For a metric micrometer, the reading is the sum of the barrel (sleeve) reading and the thimble reading multiplied by the least count (0.01 mm). In this case, the barrel reading is 38.50 mm, and the thimble reading is 24 divisions x 0.01 mm = 0.24 mm. Adding them together gives: 38.50 mm + 0.24 mm = 38.74 mm. Note that the range is 25-50 mm, but the barrel graduation already displays the actual dimension (38.5 mm), so we do not add the 25 mm offset again.

5What is the primary difference between a plunger-type and a lever-type Dial Test Indicator (DTI) when performing machine tool alignment tests?

A.Plunger-type DTIs are only used for measuring internal bores, while lever-type DTIs are used for outer surfaces

B.Plunger-type DTIs measure axial movement parallel to the plunger spindle, whereas lever-type DTIs utilize a pivoted stylus to measure angular/radial displacement in tight spaces

C.Plunger-type DTIs have a least count of 0.1 mm, while lever-type DTIs always have a least count of 0.001 mm

D.Plunger-type DTIs operate electromagnetically, whereas lever-type DTIs operate pneumatically

Explanation: A plunger-type DTI measures linear displacement parallel to its plunger shaft and has a longer measuring range (typically 5-10 mm). A lever-type DTI features a pivoted contact point (stylus) that oscillates in an arc, making it highly sensitive and compact enough to measure runout, parallelism, and concentricity in confined spaces or bores where a straight plunger cannot fit.

6Which grade of file is specifically designed for rapid removal of a large volume of metal during rough work, and has the coarsest teeth distribution?

A.Bastard file

B.Second cut file

C.Smooth file

D.Dead smooth file

Explanation: A bastard file has relatively large, widely spaced teeth (coarse grade), which allows for rapid material removal with minimum effort. It is used in the initial stage of fitting to bring the workpiece close to the required size, followed by second cut and smooth files for final sizing and surface finish.

7What is the purpose of applying Prussian Blue to a surface plate during the hand scraping of a machine guideway?

A.To act as a lubricant for the scraper tool to prevent dulling

B.To transfer paint to the high spots of the guideway, revealing which areas need to be scraped off

C.To chemically etch the surface to make it softer for manual scraping

D.To prevent the cast iron guideway from rusting during reconditioning

Explanation: During reconditioning of machine tool guideways, Prussian Blue (a pigment paste) is thinly applied to a reference master surface plate. When the guideway is rubbed against this surface plate, the pigment transfers only to the contacting high spots. The technician then scrapes away these marked high spots, repeating the process until a uniform distribution of contact spots is achieved.

8Which formula is used to calculate the correct tap drill size (TDS) for cutting an M12 thread with a pitch of 1.75 mm using a standard hand tap?

A.TDS = Major Diameter + Pitch (12 + 1.75 = 13.75 mm)

B.TDS = Major Diameter - Pitch (12 - 1.75 = 10.25 mm)

C.TDS = Major Diameter / Pitch (12 / 1.75 = 6.85 mm)

D.TDS = Major Diameter - (2 * Pitch) (12 - 3.5 = 8.50 mm)

Explanation: A widely accepted practical formula for calculating the tap drill size (TDS) for standard metric threads is: TDS = Major Diameter (D) - Pitch (P). For M12 x 1.75, TDS = 12 mm - 1.75 mm = 10.25 mm (usually rounded to the nearest standard drill size, which is 10.2 or 10.3 mm). Drilling too small of a hole will cause tap breakage, while drilling too large will result in weak, shallow threads.

9Which type of fit is obtained when the tolerance zones of the hole and shaft overlap, meaning that depending on the actual sizes of the mating parts, either a clearance or an interference fit may result?

A.Clearance fit

B.Interference fit

C.Transition fit

D.Shrink fit

Explanation: A transition fit is one where the tolerance zones of the hole and shaft overlap. Consequently, assembling a batch of parts can yield a slight clearance fit or a slight interference fit depending on the exact dimensions of the individual hole and shaft. Transition fits are typically used for locating fits where precision alignment is required, such as dowel pins and gear hubs on shafts.

10What does 'H7/g6' represent in the ISO limits and fits system, and which basis system does it follow?

A.A transition fit following the shaft basis system

B.A clearance fit following the hole basis system

C.An interference fit following the hole basis system

D.A clearance fit following the shaft basis system

Explanation: In 'H7/g6', the capital letter 'H' indicates a hole-basis system where the lower deviation of the hole is zero (basic size). The lowercase 'g' indicates a shaft tolerance zone that is completely below the zero line, providing a clearance fit. Thus, H7/g6 represents a standard clearance fit (precision sliding/running fit) under the hole-basis system.

About the ITI/NCVT Mechanic Machine Tool Maintenance (AITT Theory) Exam

The CTS Mechanic Machine Tool Maintenance (MMTM) trade trains candidates in preventive and breakdown maintenance, assembly, alignment, and testing of machine tools. Coursework includes conventional machining (lathe, milling, grinding), mechanical transmission servicing (gears, clutches, bearings), fluid power systems (hydraulics and pneumatics), CNC machine mechanisms, PLC control panels, and troubleshooting workflows. 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/1041. 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 Mechanic Machine Tool Maintenance (AITT Theory) Exam Content Outline

10%

Safety & Basic Fitting

Workshop safety, PPE, basic fitting operations (marking, filing, sawing, drilling, tapping, grinding) and tools.

20%

Mechanical Transmission Elements

Maintenance of gears, belts, pulleys, keys, couplings, shafts, clutches, bearings (sliding and rolling contact), and lubrication systems.

20%

Machine Tool Operation & Alignment

Leveling and alignment of lathes, milling machines, shapers, and grinders. Geometrical tests and wear diagnostics.

20%

Hydraulic & Pneumatic Systems

Pumps, compressors, control valves, actuators, hydraulic circuits, pneumatic symbols, and electro-pneumatic logic.

15%

CNC Machine Maintenance

CNC axis layout, ball screws, linear guides, ATC/APC mechanisms, coolant/lubrication, and basic G/M code diagnostics.

15%

Electrical, Electronic & PLC Controls

AC/DC motors, starters, solenoids, limit switches, sensors, PLC architecture, and fault tracing in control panels.

How to Pass the ITI/NCVT Mechanic Machine Tool Maintenance (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/1041. 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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Focus on highest-weighted sections
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ITI/NCVT Mechanic Machine Tool Maintenance (AITT Theory) Study Tips from Top Performers

1Review hydraulic and pneumatic ISO symbols, valve configurations (e.g., 4/3-way directional control valves), and cylinder speed controls.

2Understand the methods for checking lathe spindle runout and bed leveling using dial test indicators and precision spirit levels.

3Study PLC ladder logic symbols, input/output addressing, and basic troubleshooting of limit switches and proximity sensors.

Frequently Asked Questions

What is the full form of MMTM in ITI?

MMTM stands for Mechanic Machine Tool Maintenance, a key engineering trade under the Craftsmen Training Scheme (CTS).

Does the MMTM course cover hydraulics and pneumatics?

Yes, fluid power systems, including hydraulic pumps, pneumatic valves, cylinder actuators, and control circuits, are heavily emphasized in the syllabus.

How is the AITT CBT exam structured for MMTM?

The exam consists of 75 MCQs total: 50 questions in the Trade Theory block (38 theory, 6 WSC, 6 ED) and 25 questions in Employability Skills.

100+ Free ITI/NCVT Mechanic Machine Tool Maintenance (AITT Theory) Practice Questions

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