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Exam Review

Key Facts: Craftsman Motor Vehicles Maintenance Exam

60 items

Written CBT question count

Q-Net Craftsman qualification standard

60 minutes

Written CBT duration

Q-Net examination timetable

60% (36/60)

Written and practical passing threshold

HRD Korea grading regulations

~4 hours

Hands-on practical exam duration

Q-Net 자동차정비기능사 qualification listing

KRW 14,500

Written exam registration fee

Q-Net jmCd=6281 fee schedule (checked 2026-09-20)

KRW 41,300

Practical exam registration fee

Q-Net jmCd=6281 fee schedule (checked 2026-09-20)

2 years

Written pass exemption validity

National Technical Qualifications Act Enforcement Decree Art. 21

자동차정비기능사 is the official South Korean craftsman certification for automotive maintenance. The 2026 written CBT consists of 60 four-choice questions in 60 minutes (passing score: 60/100, 36 correct), followed by an approximately 4-hour work-type practical. Official fees are KRW 14,500 written and KRW 41,300 practical. OpenExamPrep provides 100 independent English practice questions across engine, chassis, electrical/electronic, safety, and vehicle-checking topics.

Sample Craftsman Motor Vehicles Maintenance Practice Questions

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

1In a four-stroke spark-ignition engine (4행정 가솔린 기관), what happens during the intake stroke (흡입행정)?
A.Both valves stay closed while the piston rises and compresses the mixture
B.The intake valve (흡기밸브) opens, the exhaust valve stays closed, and the descending piston draws in air-fuel mixture
C.The spark plug fires near TDC and the piston is driven downward on the power stroke
D.The exhaust valve opens and the rising piston pushes burned gas into the exhaust manifold
Explanation: On the intake stroke (흡입행정) the intake valve opens, the exhaust valve remains seated, and piston descent creates manifold depression that fills the cylinder with air-fuel mixture (or air only on a port-injected or GDI engine with fuel added separately). This is the first of the four Otto-cycle strokes used on ordinary automobile engines.
2During the compression stroke (압축행정) of a four-stroke automobile engine, which valve condition is required?
A.Intake valve open, exhaust valve closed
B.Exhaust valve open, intake valve closed
C.Both intake and exhaust valves closed so the trapped charge can be compressed
D.Both valves held slightly open to provide overlap throughout the stroke
Explanation: Compression (압축행정) requires a sealed chamber: both valves closed while the piston rises toward TDC. Sealing lets cylinder pressure and temperature rise so the spark (gasoline) or injected diesel fuel can ignite the charge. Valve overlap is a brief crank-angle window around TDC exhaust/intake, not a condition that lasts the whole compression stroke.
3On the power stroke (폭발행정 / 팽창행정) of a gasoline automobile engine, what initiates downward piston work?
A.Ignition of the compressed mixture by the spark plug (점화플러그) near TDC, with both valves closed
B.Opening the exhaust valve so atmospheric pressure pushes the piston down
C.A diesel-style unthrottled air charge with no spark and no fuel
D.Intake-valve opening so manifold vacuum pulls the piston downward
Explanation: Near the end of compression the spark plug ignites the mixture. Rapid combustion raises pressure while both valves stay closed, so expanding gas drives the piston down on the power stroke (폭발·팽창행정). That downward force is the only stroke that produces net crankshaft work in the four-stroke cycle.
4Which statement correctly describes the exhaust stroke (배기행정) in a four-stroke automobile engine?
A.The intake valve opens wide so fresh mixture scavenges the cylinder at BDC
B.Both valves remain closed while the piston rises, trapping exhaust for EGR
C.The spark plug fires again at BDC to burn leftover hydrocarbons
D.The exhaust valve (배기밸브) opens and the rising piston pushes burned gas out of the cylinder
Explanation: On the exhaust stroke (배기행정) the exhaust valve opens (often slightly before BDC) and the piston rises, expelling burned gas into the exhaust manifold. A short overlap near TDC can help scavenging, but the defining motion is an open exhaust valve with a rising piston.
5A single cylinder has a swept volume (행정체적) of 400 cm³ and a clearance volume (연소실 체적) of 50 cm³. What is the compression ratio (압축비)?
A.6.0 : 1
B.9.0 : 1
C.8.0 : 1
D.50.0 : 1
Explanation: Compression ratio (압축비) is (Vs + Vc) / Vc. Substituting Vs = 400 cm³ and Vc = 50 cm³ gives (400 + 50) / 50 = 450 / 50 = 9.0. A 9:1 ratio is typical of many naturally aspirated gasoline automobile engines; diesel ratios are much higher.
6If mechanical valve clearance (밸브 간극) is larger than specification, which symptom is most likely?
A.The valve stays off its seat when hot and is quickly burned
B.The hydraulic lash adjuster overfills and holds the valve constantly open
C.Valve clatter (타핏 음) with late opening, early closing, and reduced valve lift
D.Compression rises because the valve now seals earlier in the stroke
Explanation: Excessive 밸브 간극 means the cam must take up extra lash before the valve moves, so the valve opens late, closes early, and never reaches full lift. The extra metal-to-metal impact is heard as tappet noise. Net valve event duration shrinks, so filling and exhaust suffer rather than compression rising.
7If mechanical valve clearance (밸브 간극) is smaller than specification, what is the primary risk once the engine reaches operating temperature?
A.Thermal expansion takes up the remaining lash so the valve cannot seat, causing burning and lost compression
B.The cam lobe never contacts the tappet, so the cylinder goes dead
C.Valve noise becomes loud because impact clearance increases with heat
D.The timing belt jumps teeth because lash controls belt tension
Explanation: Valve stems and seats grow as they heat. A too-small cold clearance can go to zero in service, holding the valve slightly open. Exhaust valves are especially vulnerable: hot gas leaks across the face, the seat no longer transfers heat, and the valve burns. Compression and idle quality then collapse on that cylinder.
8A shim-over-bucket tappet (심 조정식 밸브) has a specified intake clearance of 0.20 mm. Measured clearance is 0.32 mm and the current shim is 2.50 mm thick. Which replacement shim restores the specification?
A.2.38 mm (thinner by the full measured clearance)
B.2.50 mm (no change; grind the cam instead)
C.2.70 mm (thicker by 0.20 mm, the spec value)
D.2.62 mm (thicker by the 0.12 mm excess clearance)
Explanation: On a shim-over-bucket train, a thicker shim reduces clearance. Excess clearance is 0.32 − 0.20 = 0.12 mm, so the new shim is 2.50 + 0.12 = 2.62 mm. After oiling the bucket, re-measure; automobile service manuals list shim steps in 0.05 mm or 0.025 mm increments around that calculated thickness.
9How does a hydraulic lash adjuster (유압식 래시 어저스터, HLA) maintain valve clearance in many automobile engines?
A.A mechanical screw is factory-set once and never uses engine oil
B.Engine oil pressure fills the adjuster so running clearance stays near zero without a feeler-gauge routine
C.A leaf spring in the rocker replaces oil pressure at all temperatures
D.Clearance is taken up by stretching the timing chain rather than the tappet
Explanation: An HLA is a small hydraulic jack in the tappet or rocker. Oil pressure and a check valve extend the plunger to take up lash, so the valve train runs at essentially zero clearance and does not need periodic feeler adjustment. A leak-down or dirt-stuck plunger causes tick or, if pumped up, a held-open valve.
10Why must a rubber timing belt (타이밍 벨트) on an interference automobile engine (간섭 엔진) be replaced at the specified interval even if it has not snapped?
A.Belt teeth control oil-pump pressure, which falls slowly with age
B.A worn belt is designed to slip like a drive belt to protect the valves
C.Age, heat, and mileage crack or skip belt teeth; on an interference engine that can let pistons strike open valves
D.The belt is a wear item only on diesel engines, so gasoline engines can ignore the interval
Explanation: A toothed 타이밍 벨트 synchronizes the camshaft(s) with the crankshaft. Rubber hardens, cracks, and loses teeth with heat and time. On an interference engine (간섭 엔진) piston-to-valve clearance is small enough that a jumped or broken belt lets a piston hit a valve that is still open, bending valves and sometimes damaging pistons.

About the Craftsman Motor Vehicles Maintenance Exam

Craftsman Motor Vehicles Maintenance (자동차정비기능사) is South Korea's national technical qualification for automotive service technicians, administered by HRD Korea under the Ministry of Land, Infrastructure and Transport (MOLIT). The written CBT assesses automobile engine, chassis, electrical/electronic maintenance, and safety-management knowledge. In 2012 the former Automobile Inspection Craftsman (자동차검사기능사) was merged into this qualification; this bank uses current inspection rules only where they support the present safety and vehicle-checking scope. Passing candidates proceed to the approximately 4-hour work-type practical in 자동차정비 실무. The questions on this page are an independent English-language MCQ study adaptation by OpenExamPrep; they are not an official translation or format simulation.

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

Assessment

The written exam is one combined 60-question, 60-minute subject: 자동차 엔진, 섀시, 전기·전자장치 정비 및 안전관리 (no per-subject 과락). The practical is an approximately 4-hour work-type assessment in 자동차정비 실무. OpenExamPrep provides 100 practice questions covering the related technical domains.

Time Limit

60 minutes for written CBT; approximately 4 hours for the work-type practical

Passing Score

Written: 60 points or more out of 100 (at least 36 of 60 correct); Practical: 60 points or more out of 100

Exam / Certification Fees

KRW 14,500 written / KRW 41,300 practical (total KRW 55,800)

Exam sponsor website

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

Official sources

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.

30%

Automobile Engine (자동차엔진)

Four-stroke operating cycles, valve clearance, lubrication and cooling circuits, gasoline/diesel fuel delivery, ignition, turbocharging, and basic aftertreatment.

30%

Automobile Chassis (자동차섀시)

Clutch and transmission service, driveline, suspension and steering geometry, wheels and tires, and hydraulic/ABS braking.

25%

Automobile Electrical Systems (자동차전기)

Starting and charging circuits, lighting, sensors and actuators, scan-tool basics, and introductory hybrid/EV isolation safety.

15%

Safety Management & Vehicle Checks (안전관리 및 차량 점검)

Shop safety, safe lifting and isolation, lighting and convenience-device checks, and current Motor Vehicle Management Act criteria relevant to braking, steering, and instrumentation.

Preparing for the Craftsman Motor Vehicles Maintenance Exam

What You Need to Know

  • Passing score: Written: 60 points or more out of 100 (at least 36 of 60 correct); Practical: 60 points or more out of 100
  • Assessment: The written exam is one combined 60-question, 60-minute subject: 자동차 엔진, 섀시, 전기·전자장치 정비 및 안전관리 (no per-subject 과락). The practical is an approximately 4-hour work-type assessment in 자동차정비 실무. OpenExamPrep provides 100 practice questions covering the related technical domains.
  • Time limit: 60 minutes for written CBT; approximately 4 hours for the work-type practical
  • Exam / certification fees: KRW 14,500 written / KRW 41,300 practical (total KRW 55,800) Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

Craftsman Motor Vehicles Maintenance: Suggested Study Strategy

1Treat the written paper as one 60-item Craftsman CBT: there is no 과락, so a weak engine section can be offset by chassis or electrical strength, but 36 correct answers are still required.
2Memorize 자동차관리법 시행규칙 [별표 15] inspection numbers that entered this qualification after the 2012 merger: side-slip ≤ 5 mm/m, total service-brake force ≥ 50% of 공차중량, parking brake ≥ 20%, same-axle left-right difference ≤ 8%, and speedometer indication error within +25% / −10% at 40 km/h.
3Practice Ohm's-law and charging-system calculations (voltage drop, current, resistance) and compression/valve-clearance arithmetic; craftsman papers include numeric shop-floor items.
4For the practical, use the current Q-Net candidate notice and 공개문제 for permitted tools, safety rules, task instructions, and any sitting-specific details; the official listing gives an approximate duration of 4 hours.

Frequently Asked Questions

What is Craftsman Motor Vehicles Maintenance (자동차정비기능사)?

It is a national technical qualification certified by the Human Resources Development Service of Korea (HRD Korea) under MOLIT, proving competence in diagnosing and servicing automobile engines, chassis, and electrical systems. From 1 January 2012 it also absorbed the former Automobile Inspection Craftsman (자동차검사기능사) qualification.

How is the official examination structured?

The written exam is a 60-minute Computer-Based Test (CBT) with 60 four-choice questions in the combined subject 자동차 엔진, 섀시, 전기·전자장치 정비 및 안전관리. The passing standard is 60% (36 correct out of 60) with no per-subject 과락. Candidates who pass become eligible for the approximately 4-hour work-type practical (자동차정비 실무).

Are there prerequisites to register for this exam?

No. Under the National Technical Qualifications Act, the Craftsman (기능사) grade has no eligibility prerequisites regarding age, formal education, or prior work experience.

How long is a passing written exam valid?

A passing written exam result remains valid for 2 years from the date of the written pass announcement under Article 21 of the National Technical Qualifications Act Enforcement Decree, allowing the candidate to sit for the practical exam within that window.

What are the official fees for the exam in 2026?

According to official Q-Net listings (jmCd=6281), the written CBT fee is KRW 14,500 and the hands-on practical exam fee is KRW 41,300, totaling KRW 55,800.