CDL Combination Vehicles 한국어 모의고사 2026
Free CDL Combination Vehicles practice — required for Class A (tractor + trailer). Real test is in English; native-language explanations + English-term glossary. ~20 questions on the real test, 80% to pass. 모든 문제를 무료로 연습하고 20문항 모의고사를 실제 합격선 80%로 채점하세요.
🚛 CDL 운행 전 점검 — 단계별
단계별 운행 전 점검 체크리스트 — 7단계 방법, 엔진, 일주 점검, 캡 내 에어 브레이크 점검과 자동 탈락 항목 →
🎯 주제별 연습
Driving Combination Vehicles Safely
Driving combination vehicles safely: rollover risks, steering gently to avoid the crack-the-whip effect, braking early, railroad-highway crossings, preventing trailer skids, and turning wide because of off-tracking.
Coupling and Uncoupling
Step-by-step procedure to safely couple and uncouple a tractor and semi-trailer (AAMVA §6.4): inspect the fifth wheel, line up, chock wheels, back under, test the coupling, visually check the locking jaws around the kingpin, connect lines, raise the landing gear, and remove chocks.
Inspecting a Combination Vehicle
The additional checks for combination vehicles beyond the general pre-trip: the coupling system (fifth wheel, kingpin, locking jaws), sliding fifth wheel, landing gear, air and electrical lines, and the combination-vehicle air-brake check (air to all trailers, tractor protection valve, trailer emergency and service brakes).
Air Lines & Electrical Connections
Combination-vehicle air-brake connections: the trailer hand valve, tractor protection valve, trailer air supply control (red knob), service and emergency air lines, glad hands and color-coding, trailer air tanks, shut-off valves, and the trailer electrical cord.
ABS on Combination Vehicles
Antilock braking systems on tractors, trailers and converter dollies: which units must have ABS, yellow malfunction lamps, how ABS helps you keep steering control without shortening stopping distance, braking normally, and mixed-ABS towing.
📚 이 시험 학습 가이드
🧰 이 자격증으로 할 수 있는 일
일자리 보기 →🧭 이 길의 다음 단계 — 신규 이민자 커리어 경로
이 시험이 미국 면허·자격 사다리에서 어디에 속하는지 확인하세요 — 중위 급여와 각 실제 시험의 응시 언어 포함 →
📋 준비물
- ✓
Proof of identity & U.S. residency
Documents required vary by state — check your state DMV's CDL page.
- ✓
Social Security number
- ✓
DOT medical certificate (for the CDL/CLP)
Most CDL applicants must be medically certified; bring your med card.
📅 예약 방법
- 1
Study the CDL manual
Use your state's CDL manual (AAMVA model) for General Knowledge, Air Brakes and Combination Vehicles.
- 2
Apply for a Commercial Learner's Permit (CLP)
Pass the required knowledge tests at your state DMV to get the CLP, then practice before the skills test.
- 3
Check your state's specifics
Test languages, fees, scheduling (appointment vs walk-in) and retake rules vary by state — see the per-state table on this page.
💡 시험 당일 팁
- •Required for a Class A license (tractor + trailer). Master coupling/uncoupling and the combination inspection.
- •Know rollover prevention (keep cargo low/centered, slow in turns), off-tracking (turn wide), and trailer-skid recovery (release brakes).
🔗 공식 자료
FMCSA — Commercial Driver's License ↗
Federal CDL overview, classes, endorsements, and English-language-proficiency rules.
AAMVA — CDL Testing ↗
The model CDL manual & testing system that state CDL manuals are based on.
Find your state's CDL manual & test info ↗
Languages, fees, scheduling and pass rules vary by state — see your state DMV (and our per-state table).
❓ 자주 묻는 질문
CDL Combination Vehicles 시험은 몇 문항이며 몇 개를 맞혀야 합격하나요?
CDL Combination Vehicles 필기시험은 20문항이며 16개(80%)를 맞혀야 합격합니다.
CDL Combination Vehicles 시험에서 몇 개까지 틀려도 되나요?
20문항 중 최대 4개까지 틀려도 합격합니다.
CDL Combination Vehicles 시험에 무엇을 가져가야 하나요?
Proof of identity & U.S. residency — Documents required vary by state — check your state DMV's CDL page. Social Security number DOT medical certificate (for the CDL/CLP) — Most CDL applicants must be medically certified; bring your med card.
CDL Combination Vehicles 시험은 어떻게 예약하고 보나요?
1. Study the CDL manual: Use your state's CDL manual (AAMVA model) for General Knowledge, Air Brakes and Combination Vehicles. 2. Apply for a Commercial Learner's Permit (CLP): Pass the required knowledge tests at your state DMV to get the CLP, then practice before the skills test. 3. Check your state's specifics: Test languages, fees, scheduling (appointment vs walk-in) and retake rules vary by state — see the per-state table on this page.