Free Practice Questions for Engineer General Machinery
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Key Facts: Engineer General Machinery Exam
80 items
Official written exam paper length (4 subjects × 20)
Q-Net Engineer General Machinery (jmCd 1021, 2024 integrated syllabus)
120 minutes
Written examination duration (30 minutes per subject)
Q-Net 필기시험 접수안내 (기사·산업기사 과목별 30분)
40 / 60
Passing standard: 40% individual subject floor (과락) and 60% overall average
National Technical Qualifications Act Enforcement Rules
KRW 19,400
Written exam registration fee
Q-Net 일반기계기사 page, checked 2026-09-20
KRW 43,400
Practical exam registration fee (composite: written + CAD)
Q-Net 일반기계기사 page, checked 2026-09-20
2 years
Exemption duration for written test pass
National Technical Qualifications Act Enforcement Decree Article 21
일반기계기사 is South Korea's benchmark Engineer-grade mechanical qualification (jmCd 1021, MOTIR / HRD Korea). Under the integrated 2024 syllabus, the official written exam comprises 80 MCQs across four subjects (20 per subject, 30 min each, 120 min total) requiring a 40% per-subject floor and 60% overall average, followed by a composite practical exam (복합형) combining written design calculations (필답형, 50 pts) and 2D/3D CAD drafting (작업형, 50 pts). Official Q-Net fees are KRW 19,400 (written) and KRW 43,400 (practical). OpenExamPrep provides an independent 100-question English MCQ practice bank.
Sample Engineer General Machinery Practice Questions
Try these sample questions to review concepts for the Engineer General Machinery exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1According to Korean Standard KS B 0001 (기계제도 기본 통칙) and ISO drafting conventions, which line type and thickness must be used to represent the visible outlines (외형선) of a mechanical part?
2In mechanical engineering drawings governed by KS B 0001, how does the standard third-angle projection method (제3각법) arrange the viewer, the projection plane, and the target object?
3When sectioning a symmetrical cylindrical component in machine drafting, which sectioning method removes one quarter of the object to display both the external view and internal structure on either side of the centerline?
4Under KS B 0401 (치수공차 및 끼워맞춤), which statement correctly defines a transition fit (중간 끼워맞춤)?
5A cylindrical bearing assembly is specified with a hole-basis fit of Ø50 H7/g6 under KS B 0401. The basic size is 50 mm, with standard limit deviations given as Hole Ø50 H7 (+0.025 mm, 0 mm) and Shaft Ø50 g6 (-0.009 mm, -0.025 mm). What are the maximum and minimum clearances (최대 틈새 및 최소 틈새) for this joint?
6A press-fit coupling requires an interference fit specified as Ø40 H7/p6. The tolerances are Hole Ø40 H7 (+0.025 mm, 0 mm) and Shaft Ø40 p6 (+0.042 mm, +0.026 mm). What are the maximum and minimum interferences (최대 죔새 및 최소 죔새)?
7In Geometric Dimensioning and Tolerancing (GD&T, 기하공차) under KS B 0242 / ISO 1101, which of the following geometric characteristics is classified strictly as a form tolerance (모양 공차) and therefore cannot reference a datum?
8A shaft feature drawing contains a GD&T feature control frame displaying an arrow tilted at 45 degrees pointing to a horizontal line alongside 'Ø 0.03 | A-B'. What type of geometric tolerance does this symbol represent?
9In surface roughness designation under KS B 0617 / ISO 1302, what parameter is defined as the arithmetical mean deviation of the assessed profile (산술평균 거칠기) from the mean line within the sampling length?
10A triple-start metric power screw (3줄 나사) has a nominal pitch p = 4 mm. If the screw rotates at 120 rpm, what is the axial linear velocity of the driven nut?
About the Engineer General Machinery Exam
Engineer General Machinery (일반기계기사) is South Korea's benchmark Engineer-grade national technical qualification in mechanical engineering, administered by the Human Resources Development Service of Korea (HRD Korea / Q-Net) under the Ministry of Trade, Industry and Resources (MOTIR / 산업통상부). Following the 2024 qualification reform that integrated General Machinery and Mechanical Design, the written examination evaluates 80 four-option multiple-choice questions across four core subjects: Machine Drafting and Design, Mechanical Materials and Manufacturing, Structural Analysis, and Thermal and Fluid Analysis. Candidates passing the written paper advance to a demanding composite practical examination (복합형) comprising written machine design calculations (필답형, 50 points) and computer-aided 2D drafting and 3D solid modeling (작업형, 50 points). OpenExamPrep provides an independent English-language MCQ study adaptation designed for mastery of core mechanical engineering principles, authentic calculations, and Korean technical terminology.
Exam sponsor: HRD Korea (Q-Net) / Ministry of Trade, Industry and Resources (MOTIR / 산업통상부). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.
Assessment
Written paper covering 기계제도 및 설계 (Machine Drafting & Design), 기계재료 및 제작 (Mechanical Materials & Manufacturing), 구조해석 (Structural Analysis), and 열·유체해석 (Thermal & Fluid Analysis) with 20 items and 30 minutes each (80 items / 120 minutes total), followed by a composite practical examination (복합형) combining written machine design calculations (필답형, approx. 2 hours, 50 points) and 2D/3D CAD drafting/modeling (작업형, approx. 5 hours, 50 points). OpenExamPrep study weights cover all four written subjects.
Time Limit
120 minutes for the four written subjects (30 minutes each); practical: composite (approx. 2 hours written design calculations + 5 hours 2D/3D CAD)
Passing Score
Written: 40+ per subject (과락 floor) and 60 average; practical: 60/100
Exam / Certification Fees
KRW 19,400 written / KRW 43,400 practical (Q-Net, 2026-09-20)
Exam sponsor websiteFees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.
Official sources
- Q-Net Engineer General Machinery (일반기계기사) exam page (jmCd=1021) · Source checked 2026-09-20Official Korean/English titles, 산업통상부 (MOTIR), HRD Korea, 2026 Engineer session schedules, written/practical fees KRW 19,400 / 43,400, and current 출제기준 qualification specifications under the 2024 integrated syllabus.
- Q-Net national technical qualification grading method (Engineer grade) · Source checked 2026-09-20Written: four-option MCQ, 20 items per subject, 40 points per subject floor (과락) and 60 points overall average. Practical: 60/100.
- Q-Net written-exam timing (기사·산업기사 과목별 30분) · Source checked 2026-09-20Total 120 minutes for 4 subjects (30 minutes per subject).
- National Technical Qualifications Act Enforcement Decree — 2-year written-pass exemption · Source checked 2026-09-20Article 21 provides a two-year exemption from the written exam for candidates who pass the written paper.
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.
Machine Drafting and Design (기계제도 및 설계)
KS B 0001 drafting conventions, orthographic projections (1st and 3rd angle), sectioning methods, KS B 0401 limits and fits (clearance, transition, interference fits; hole/shaft basis), GD&T symbols, surface roughness (Ra, Rz), threaded fasteners, power screws, keys and splines, riveted and welded joints, shafts under combined bending and torsion, rolling bearings L10 life, journal bearings and Sommerfeld number, spur/helical/bevel gears, belt and chain drives, and friction clutches/brakes.
Mechanical Materials and Manufacturing (기계재료 및 제작)
Iron-carbon (Fe-C) equilibrium phase diagram, heat treatments (annealing, normalizing, quenching, tempering), surface hardening (carburizing, nitriding, induction), alloy steels, tool steels, stainless steels, cast irons, non-ferrous alloys (aluminum, brass, bronze, titanium), engineering ceramics and polymers, sand/die/investment casting and casting defects, metal forming (forging, rolling, extrusion, drawing, sheet bending, deep drawing LDR), cutting mechanics, Merchant's circle, tool geometry, Taylor's tool life equation, grinding wheels, non-traditional machining (EDM, ECM, laser), and welding processes.
Structural Analysis (구조해석)
Axial stress and strain, Hooke's law, elastic constants (E, G, K, ν), thermal stress, statically indeterminate structures, shear force and bending moment diagrams (SFD/BMD), beam flexural stress (σ = My/I), beam transverse shear stress (τ = VQ/Ib), beam deflection methods (double integration, moment-area, superposition, Castigliano's theorem), combined loading, Mohr's circle for plane stress, failure theories (Tresca, von Mises, Rankine), fatigue and S-N endurance limits, mean stress corrections (Goodman, Soderberg), Euler column buckling (Pcr = π²EI/(KL)²), and single-degree-of-freedom mechanical vibrations (natural frequency, damping ratio, resonance, transmissibility).
Thermal and Fluid Analysis (열·유체해석)
State properties, ideal gas law, specific heats (Cp, Cv, k), First Law of Thermodynamics for closed and open systems, Second Law, Carnot efficiency, COP of refrigeration/heat pumps, entropy and Clausius inequality, gas power cycles (Otto, Diesel, Brayton), steam power Rankine cycle (reheat, regeneration), vapor compression refrigeration, fluid statics (hydrostatic pressure, center of pressure, buoyancy), continuity equation, Bernoulli's equation, Pitot and Venturi flowmeters, momentum equation on vanes, pipe flow (laminar Hagen-Poiseuille, turbulent Reynolds number, Darcy-Weisbach friction head loss), and boundary layer theory (skin friction drag, form drag, separation).
Preparing for the Engineer General Machinery Exam
What You Need to Know
- Passing score: Written: 40+ per subject (과락 floor) and 60 average; practical: 60/100
- Assessment: Written paper covering 기계제도 및 설계 (Machine Drafting & Design), 기계재료 및 제작 (Mechanical Materials & Manufacturing), 구조해석 (Structural Analysis), and 열·유체해석 (Thermal & Fluid Analysis) with 20 items and 30 minutes each (80 items / 120 minutes total), followed by a composite practical examination (복합형) combining written machine design calculations (필답형, approx. 2 hours, 50 points) and 2D/3D CAD drafting/modeling (작업형, approx. 5 hours, 50 points). OpenExamPrep study weights cover all four written subjects.
- Time limit: 120 minutes for the four written subjects (30 minutes each); practical: composite (approx. 2 hours written design calculations + 5 hours 2D/3D CAD)
- Exam / certification fees: KRW 19,400 written / KRW 43,400 practical (Q-Net, 2026-09-20) Official sources
Using Our Practice Resources
- Work through all 100 available questions
- Review every answer and explanation
- Track weak areas and revisit them
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Engineer General Machinery: Suggested Study Strategy
Frequently Asked Questions
What is the official structure of the Engineer General Machinery (일반기계기사) examination under the 2024 integrated syllabus?
Starting in 2024, the qualification integrated the former Engineer General Machinery and Engineer Mechanical Design syllabi into a streamlined 4-subject written examination and a composite practical exam. Phase 1 is a 120-minute written examination featuring 80 four-option multiple-choice questions (20 questions each across Machine Drafting & Design, Mechanical Materials & Manufacturing, Structural Analysis, and Thermal & Fluid Analysis). Phase 2 is a composite practical examination (복합형, 100 points) consisting of written machine design calculation (필답형, approx. 2 hours, 50 points) and 2D/3D CAD drafting/modeling (작업형, approx. 5 hours, 50 points).
What are the passing criteria and the 'gwarak' (과락) rule?
To pass the written examination, a candidate must obtain an overall average score of at least 60% (48 out of 80 questions correct across all four subjects) AND achieve at least 40% in every individual subject (at least 8 out of 20 correct per subject). Scoring below 40% (fewer than 8 correct) in any single subject constitutes an automatic disqualification ('gwarak', 과락), regardless of the overall average. The composite practical exam requires an aggregate score of at least 60 points out of 100.
What are the exam registration fees and where do candidates register?
As published on Q-Net (jmCd 1021, verified for 2026), the written exam registration fee is KRW 19,400, and the practical exam fee is KRW 43,400. Registration is conducted online through the official HRD Korea portal (q-net.or.kr) during designated national testing windows.
How long is a written exam pass valid for the practical exam?
Under Article 21 of the Enforcement Decree of the National Technical Qualifications Act (국가기술자격법 시행령 제21조), a candidate who passes the written examination is granted an exemption from the written test for exactly 2 years from the date of the written pass announcement, during which they can challenge the practical examination.
What is OpenExamPrep's relationship to the official Q-Net examination?
OpenExamPrep provides an independent English-language MCQ practice bank covering the written topics and Korean technical terminology. It is not affiliated with or endorsed by HRD Korea or 산업통상부 (MOTIR). The official Q-Net examination is administered in Korean, and candidates must take the official test and practical paper through Q-Net.