150+ Free CDL Tanker Practice Questions
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Key Facts: CDL Tanker Exam
80%
Passing Score
49 CFR 383.133
~20
Questions
Varies by state
$10-25
Endorsement Test Fee
State DMV
1,000 gal
Tank Capacity Threshold
FMCSA
N
Endorsement Code
CDL endorsement
X = H + N
Hazmat + Tanker Combined
FMCSA
The CDL Tanker Endorsement (N) knowledge test requires an 80% passing score on approximately 20 multiple-choice questions. The test covers liquid surge and slosh dynamics, tank vehicle inspection, driving techniques (smooth braking, speed management), weight distribution, emergency procedures, and FMCSA regulations. The endorsement is required for hauling 1,000+ gallons of liquid or gaseous cargo in tanks. Combined with Hazmat (H), it creates the X endorsement for hazardous liquid transport.
About the CDL Tanker Exam
The CDL Tanker Endorsement (N) is required for commercial drivers who transport liquid or gaseous materials in tanks. The knowledge test covers tank vehicle characteristics, driving techniques, inspection procedures, and emergency protocols specific to hauling tanker cargo under federal (49 CFR 383) and state DMV standards.
Questions
20 scored questions
Time Limit
30 minutes
Passing Score
80%
Exam Fee
$10-25 (State DMV / FMCSA)
CDL Tanker Exam Content Outline
Tank Vehicle Characteristics
Liquid surge and slosh dynamics, center of gravity, baffled vs unbaffled tanks, smooth bore tanks, outage (ullage), weight distribution, rollover risks
Driving Techniques
Smooth acceleration and braking, speed management on curves, following distance, lane changes, downhill operations, effects of partially loaded tanks
Inspection and Safety
Pre-trip inspection of tanks, valves, and piping, emergency vents, manhole covers, tank structural integrity, leaks and damage, safety equipment
Emergency Procedures and Regulations
Spill response, emergency stops, tank vehicle fires, 49 CFR 383 requirements, combined endorsements (X = H + N), FMCSA tanker regulations
How to Pass the CDL Tanker Exam
What You Need to Know
- Passing score: 80%
- Exam length: 20 questions
- Time limit: 30 minutes
- Exam fee: $10-25
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
CDL Tanker Study Tips from Top Performers
Frequently Asked Questions
How many questions are on the CDL Tanker endorsement test?
The CDL Tanker Endorsement (N) knowledge test typically has 20 multiple-choice questions (exact count varies by state). You need 80% (16/20) to pass. The test focuses on tank vehicle characteristics, driving techniques, inspection procedures, and emergency protocols.
What is liquid surge and why does it matter?
Liquid surge (also called slosh) is the movement of liquid inside a partially loaded tank. When you brake, accelerate, or turn, the liquid shifts and creates momentum that pushes the vehicle in the direction the liquid is moving. This makes tanker vehicles more prone to rollovers and harder to stop. Baffled tanks reduce surge but do not eliminate side-to-side movement.
What is the difference between baffled and unbaffled tanks?
Baffled tanks have internal walls (baffles) with holes that slow the forward-and-backward surge of liquid. Unbaffled (smooth bore) tanks have no internal walls and allow unrestricted liquid movement. Smooth bore tanks are used for food-grade products (easier to clean) but are the most dangerous because surge is completely unrestricted. Drivers must use extra caution with smooth bore tanks.
Do I need the CDL Tanker endorsement?
You need the Tanker endorsement (N) if you will be driving a commercial motor vehicle that transports liquid or gaseous materials in a tank with a rated capacity of 1,000 gallons or more. If you also transport hazardous materials in a tank, you need the X endorsement (combination of Hazmat H + Tanker N).
What is outage and why is it important?
Outage (also called ullage) is the amount of empty space left in a tank after loading. Liquids expand when heated, so tanks are never completely filled. Outage allows room for expansion and prevents dangerous pressure buildup. The required outage depends on the liquid being transported and ambient temperature conditions.
How should I drive a tanker vehicle on curves?
Slow down before entering the curve, not during it. Tanker vehicles have a higher center of gravity, making them especially susceptible to rollovers on curves. The posted speed limit on curves is designed for cars, not heavy tanker trucks. Reduce speed to well below the posted limit, especially when the tank is partially loaded (worse surge effect).