Free Practice Questions for Craftsman Computer Aided Mechanical Drawing

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Key Facts: Craftsman Computer Aided Mechanical Drawing Exam

60 items

Written CBT question count

Q-Net Craftsman qualification specification

60 minutes

Written CBT examination time limit

Q-Net national technical qualification CBT rules

60 / 100

Passing mark for written (36/60 items) and practical

National Technical Qualifications Act Enforcement Rules

KRW 14,500

Written examination fee

Q-Net portal fee schedule (checked 2026)

KRW 23,300

Practical examination fee

Q-Net qualification detail page (2026)

2 years

Exemption period for written exam pass

National Technical Qualifications Act Enforcement Decree Article 21

전산응용기계제도기능사 is HRD Korea's craftsman-grade mechanical drafting qualification, with the Ministry of Trade, Industry and Energy as competent ministry. The 60-minute written CBT is 60 four-option items (pass mark 60/100) on one merged subject, 기계설계제도, covering drawing conventions, machine elements, measurement, machining and materials. Fees are KRW 14,500 written and KRW 23,300 practical on Q-Net. OpenExamPrep provides independent English MCQ practice, not an official translation or a CAD practical simulation.

Sample Craftsman Computer Aided Mechanical Drawing Practice Questions

Try these sample questions to review concepts for the Craftsman Computer Aided Mechanical Drawing exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1According to the Korean Industrial Standards (KS D 3752), what does the material designation 'SM45C' represent?

A.Alloy tool steel with 4.5% chromium content

B.Carbon steel for machine structural use containing approximately 0.45% carbon

C.Spring steel with a minimum tensile strength of 450 MPa

D.Gray cast iron with a pearlite matrix and 0.45% sulfur

Explanation: In KS D 3752, 'SM' stands for Steel Machine (기계구조용 탄소강재), '45' indicates the median nominal carbon content of 0.45% (actual range 0.42% to 0.48%), and 'C' represents Carbon. It is widely normalized or quenched and tempered to produce shafts, gears, and pins.

2How do the mechanical properties of plain carbon steel change at room temperature as its carbon content increases from 0.1% up to approximately 0.8% (eutectoid point)?

A.Tensile strength decreases while elongation and impact toughness increase

B.Hardness decreases while forgeability and machinability improve linearly

C.Hardness and tensile strength increase while ductility, elongation, and impact toughness decrease

D.Ductility and toughness increase continuously without any change in hardness

Explanation: As carbon content increases in unhardened carbon steel up to the eutectoid composition (0.77~0.8% C), the proportion of hard cementite (Fe3C) increases at the expense of soft ferrite. Consequently, both hardness (경도) and tensile strength (인장강도) increase, whereas elongation (연신율), reduction in area, and impact toughness decrease.

3What is the primary characteristic indicated by the material symbol 'SS400' specified in KS D 3503?

A.Rolled steel for general structure with a minimum tensile strength of 400 N/mm²

B.Stainless steel plate with 40.0% chromium and nickel alloy content

C.Cast carbon steel with a guaranteed yield strength of 400 MPa

D.Special tool steel with a Vickers hardness value of 400 HV

Explanation: In KS D 3503, 'SS' stands for Steel Structure (일반구조용 압연강재) and '400' denotes the minimum guaranteed tensile strength of 400 N/mm² (or MPa). Unlike SM45C where the number indicates carbon content, SS structural steels specify mechanical strength.

4Which material designation represents a chromium-molybdenum structural alloy steel widely used in heavy-duty shafts and connecting rods due to its high hardenability and resistance to temper brittleness?

A.GC250

B.SM20C

C.SPS5

D.SCM440

Explanation: SCM440 (KS D 3867) is a chromium-molybdenum structural alloy steel (크롬-몰리브덴강) containing approx. 0.40% C with Cr and Mo additions. Molybdenum prevents temper brittleness and improves hardenability, making SCM440 ideal for high-strength machine shafts, studs, and transmission gears.

5What is the key metallurgical reason why ductile cast iron (구상흑연주철, GCD450) exhibits significantly higher tensile strength and elongation compared to ordinary gray cast iron (회주철, GC200)?

A.All carbon is completely dissolved as interstitial austenite at room temperature

B.Graphite flakes are converted into spheroidal nodules by adding magnesium (Mg) or cerium (Ce), reducing internal notch stress

C.Rapid water quenching from 1100°C transforms the entire iron matrix into brittle martensite

D.The carbon content is lowered below 0.02% to turn the cast iron into pure ferrite

Explanation: In gray cast iron, graphite exists as sharp flakes that act as severe internal stress risers (notches), causing brittle failure. By inoculating molten iron with magnesium (Mg) or cerium (Ce), the graphite precipitates as spheres (spheroids), minimizing notch concentration and dramatically boosting tensile strength, ductility, and impact toughness in GCD450.

6What is the primary operational procedure and metallurgical purpose of quenching (담금질)?

A.Heating above the critical temperature into the austenite range followed by rapid cooling in water or oil to form martensite

B.Reheating a hardened piece below the A1 line followed by air cooling to eliminate brittleness

C.Holding the steel in a furnace for several days at 300°C to maximize pearlite grain size

D.Slow cooling inside a switched-off furnace to obtain the softest possible microstructure

Explanation: Quenching (담금질) consists of heating hypoeutectoid steel to 30~50°C above the A3 transformation temperature (austenite range) and rapidly cooling it in water or oil. This suppresses the pearlite transformation and forms a hard, supersaturated solid solution of carbon in body-centered tetragonal iron known as martensite (마르텐사이트).

7Which heat treatment operation is performed immediately after quenching to relieve internal residual stresses, reduce brittleness, and impart toughness (인성)?

A.Normalizing (불림)

B.Carburizing (침탄)

C.Tempering (뜨임)

D.Sub-zero treatment (심랭처리)

Explanation: As-quenched martensite is extremely hard, brittle, and contains severe internal thermal and transformational residual stresses. Tempering (뜨임) involves reheating the quenched component below the A1 critical temperature (typically 150~650°C) to relieve residual stresses and trade excessive hardness for improved toughness and ductility.

8What is the primary cooling method and operational objective of full annealing (완전풀림) in steel heat treatment?

A.Quenching into ice brine to obtain maximum surface hardness

B.Rapid air blasting on an open workshop floor to develop uniform fine grains

C.Submerging in a hot oil bath at 250°C to create bainite structures

D.Slow cooling inside the furnace (노랭) to relieve residual stress, soften the steel, and improve machinability

Explanation: Full annealing (완전풀림) involves heating hypoeutectoid steel 30~50°C above A3 and then allowing it to cool very slowly inside the furnace (노랭). This produces coarse pearlite and ferrite, minimizing hardness, relieving residual casting or forging stresses, and optimizing machinability.

9In heat treatment terminology, what cooling medium and objective define the normalizing (불림) process?

A.Water quenching to transform coarse pearlite into martensite

B.Still air cooling (공랭) from above the upper critical line to refine grains and standardize mechanical properties

C.Furnace cooling over 48 hours to minimize tensile strength

D.Liquid nitrogen immersion to eliminate retained austenite

Explanation: Normalizing (불림) involves heating the steel 30~50°C above the A3 or Acm line, soaking, and then cooling in still air (공랭). Because air cooling is faster than furnace cooling, it produces a finer, more uniform pearlite microstructure, eliminates internal stresses from prior casting or rolling, and establishes a standardized reference state.

10Which surface hardening process diffuses nitrogen into the surface of alloy steel at relatively low temperatures (500~550°C) without requiring subsequent quenching, thereby minimizing thermal distortion?

A.Pack carburizing (고체침탄법)

B.Induction surface hardening (고주파 열처리)

C.Nitriding (질화법)

D.Flame hardening (화염경화법)

Explanation: Nitriding (질화법) heats steel containing aluminum, chromium, or molybdenum in dissociated ammonia gas (NH3) at 500~550°C. Nascent nitrogen diffuses into the surface forming extremely hard alloy nitrides (up to 1000~1200 HV). Because it is carried out below the A1 transformation temperature and does not require quenching, distortion is exceptionally low.

About the Craftsman Computer Aided Mechanical Drawing Exam

Craftsman Computer Aided Mechanical Drawing (전산응용기계제도기능사) is a national technical qualification administered by HRD Korea through Q-Net, with the Ministry of Trade, Industry and Energy as the competent ministry. Its written paper is a single merged subject, 기계설계제도, built on NCS units that span 2D drawing work and management, 3D shape modelling and review, fastening and power transmission element design, use of basic measuring instruments, basic lathe and milling work, and assembly drawing interpretation; the older three-subject structure of 기계재료 및 요소, 기계가공법 및 안전관리 and 기계제도 was consolidated into it. Passing the written paper leads to a CAD practical test of about five hours in which the candidate produces a 2D detail drawing and a 3D model from a given assembly drawing. OpenExamPrep provides an independent English-language MCQ study adaptation; it is not an official translation and it does not simulate the CAD practical.

Exam sponsor: HRD Korea (Q-Net) / Ministry of Trade, Industry and Energy (MOTIE). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Written examination of 60 four-option CBT questions in 60 minutes on the single official subject 기계설계제도 - the former three-subject split into 기계재료 및 요소, 기계가공법 및 안전관리 and 기계제도 was consolidated into this one NCS-based subject - followed by a work-type CAD practical test in 기계설계제도 실무 of about 5 hours in which a 2D detail drawing and a 3D model are produced from a given assembly drawing.

Time Limit

60 minutes written; approx. 5 hours practical

Passing Score

Written: 60/100 (36/60); practical: 60/100

Exam / Certification Fees

KRW 14,500 written / KRW 23,300 practical (Q-Net, 2026)

Exam sponsor website

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

Official sources

Q-Net qualification detail page for Craftsman Computer Aided Mechanical Drawing (전산응용기계제도기능사) · Source checked 2026-09-21Official qualification record: written subject, practical subject, fees and sitting schedule.
Enforcement Rules of the National Technical Qualifications Act, Table 8 (국가기술자격법 시행규칙 [별표 8]) · Source checked 2026-09-21Statutory subjects: 필기시험 기계설계제도 / 실기시험 기계설계제도 실무. The earlier three-subject split was consolidated into this single NCS-based subject.
Korean Industrial Standards for technical drawing (KS B 0001 and related KS B/KS D standards) · Source checked 2026-09-21Drawing conventions, line precedence, sectioning rules, dimensioning symbols, limits and fits (KS B 0401), geometric tolerancing (KS B 0425), surface texture (KS B 0161, KS B 0617), and material designations.

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.

Main item

2D drawing work and management (2D도면작업·관리)

A-series sheet sizes and the lower-right title block, enlargement and reduction scales, line types and the precedence order outline-hidden-cutting plane-centre-centroid-dimension, third angle projection, auxiliary and detail views, full, half, broken-out and revolved sections, parts never hatched, spherical and chamfer callouts, and chain versus baseline dimensioning.

Main item

3D modelling and data exchange (3D형상모델링·검토)

Relative and polar CAD coordinate entry, fillet and chamfer, extrude, revolve, sweep, loft and shell, Boolean union, difference and intersection, and why STEP preserves B-rep solids where STL and DXF do not.

Main item

Fastening and power transmission elements (체결·동력전달요소설계)

M-designation threads and lead of multi-start screws, taper versus parallel pipe threads, castle nut and split pin, Woodruff keys and splines, shaft torsion sizing and critical speed, Oldham couplings, bearing codes such as 6204ZZ and 6308, spur gear pitch, tip and centre distances, helical thrust, bevel and worm drives, spring rates and the capstan formula.

Main item

Measurement and surface texture (기본측정기 사용)

Vernier least count, micrometer ratchet stop, dial indicators, sine bar geometry, gauge block wringing, Ra definition, KS B 0617 machining-prohibited and machining-required symbols, and the conventional triangle finish grades.

Main item

Lathe, milling and machine operations (기본작업)

Tailstock and lathe construction, cutting speed and spindle speed calculation, tailstock offset taper turning, chip formation and built-up edge, up- and down-milling, dividing head indexing, drill point angle, counterboring and spot facing, grinding wheel designation, truing, dressing, glazing and loading, CNC G- and M-codes and canned cycles, and rotating-machinery safety.

Main item

Materials, heat treatment and tolerancing (조립도면해독·재료)

SM45C, SS400, SCM440, grey and ductile cast irons, brasses, phosphor bronze, duralumin and white metal, quenching, tempering, annealing, normalising and nitriding, limits and fits including hole-basis and shaft-basis systems and clearance and interference calculations, and form, orientation, location and runout geometric tolerances.

Preparing for the Craftsman Computer Aided Mechanical Drawing Exam

What You Need to Know

Passing score: Written: 60/100 (36/60); practical: 60/100
Assessment: Written examination of 60 four-option CBT questions in 60 minutes on the single official subject 기계설계제도 - the former three-subject split into 기계재료 및 요소, 기계가공법 및 안전관리 and 기계제도 was consolidated into this one NCS-based subject - followed by a work-type CAD practical test in 기계설계제도 실무 of about 5 hours in which a 2D detail drawing and a 3D model are produced from a given assembly drawing.
Time limit: 60 minutes written; approx. 5 hours practical
Exam / certification fees: KRW 14,500 written / KRW 23,300 practical (Q-Net, 2026) Official sources

Using Our Practice Resources

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Craftsman Computer Aided Mechanical Drawing: Suggested Study Strategy

1Work from the single subject 기계설계제도 and its NCS units rather than the retired three-subject split; the paper mixes drawing, elements, measurement, machining and materials freely.

2Learn the KS drawing conventions as rules you can state: the precedence order of coinciding lines, which elements are never hatched along their axis, and how threads and gears are drawn.

3Drill the limits and fits arithmetic until it is automatic - tolerance, maximum and minimum limit size, maximum and minimum clearance, and maximum and minimum interference - and remember that H holes have zero lower deviation and h shafts zero upper deviation.

4Memorise the gear formulas as a family: d = mz, da = m(z + 2), a = m(z1 + z2)/2, and whole depth 2.25m for a full-depth tooth.

5Know the machining calculations: V = πDN/1000, N = 1000V/πD, tailstock offset s = L(D - d)/2l, and dividing head n = 40/Z.

6Learn the KS material codes by what the number means - carbon content in SM45C, minimum tensile strength in SS400 - and pair each heat treatment with its cooling medium.

7Group the geometric tolerances by class: form tolerances take no datum, orientation and location tolerances do, and runout is measured in rotation.

8Keep the Korean terms alongside the English concepts, because the official Q-Net CBT is delivered in Korean.

Frequently Asked Questions

What is Craftsman Computer Aided Mechanical Drawing (전산응용기계제도기능사)?

It is South Korea's official national technical qualification for CAD-based mechanical drafting and design, administered by HRD Korea via Q-Net under the Ministry of Trade, Industry and Energy (MOTIE). It certifies competence in reading and producing mechanical production drawings according to Korean Industrial Standards (KS).

Who is eligible to register for the exam?

There are no restrictions. As a Craftsman (기능사) level examination under the National Technical Qualifications Act, anyone can apply regardless of academic background, major, or prior CAD experience.

What is the examination structure and passing grade?

The written exam is a 60-minute CBT with 60 four-option multiple-choice questions on the single official subject 기계설계제도, which replaced the older three-subject split. The passing score is 60 out of 100 (at least 36 correct answers). The practical exam is a work-type CAD test in 기계설계제도 실무 lasting about 5 hours, also requiring 60 points or more out of 100.

What are the fees and written pass exemption rules?

The official Q-Net fees are KRW 14,500 for the written CBT and KRW 23,300 for the CAD practical test. Passing the written examination grants a two-year exemption from retaking it.

Is this practice bank affiliated with HRD Korea or MOTIE?

No. This practice bank is an independent English-language MCQ study adaptation by OpenExamPrep designed to assist learners in understanding mechanical design principles and Korean standards. It is not an official translation, not an official CBT simulator, and does not simulate CAD software tasks.