25 realistic Tank Vehicles practice questions for Minnesota CDL applicants. Required for: Vehicles with liquid or gaseous tanks ≥1,000 gallons. Official test: 20 questions, 16 correct to pass.
Question 1 of 25 · Emergencies
What action should a driver take if a tank starts to leak?
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A.
Stop immediately in a safe area and report the leak
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B.
Continue to destination
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C.
Try to close the leak
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D.
Drive faster
Correct answer: A.
Stop in a safe area, secure the area, and notify the carrier and emergency services.
Question 2 of 25 · HazMat Driving
Why is "no smoking" enforced near tankers?
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A.
Risk of fire and explosion from cargo vapors
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B.
Cleanliness
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C.
Tradition
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D.
OSHA rules only
Correct answer: A.
Vapors can ignite or explode; smoking is prohibited near tankers.
Question 3 of 25 · Vehicle Dynamics
How can drivers prevent tanker rollover?
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A.
Reduce speed in curves and ramps
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B.
Avoid sudden steering
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C.
Maintain proper load and securement
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D.
All of the above
Correct answer: D.
Slow speed, smooth steering, and proper loading all help prevent rollovers.
Question 4 of 25 · Loading
When loading tanks, what must drivers consider?
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A.
Outage requirements for the liquid
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B.
Weight distribution between compartments
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C.
Surge potential
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D.
All of the above
Correct answer: D.
Outage, weight distribution, and surge management all matter when loading tanks.
Question 5 of 25 · Emergency Equipment
What equipment must be on a HazMat tank vehicle?
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A.
Emergency response equipment
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B.
Spill kits as required
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C.
Communication devices
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D.
All of the above
Correct answer: D.
Carry spill response gear, communication, and any other required equipment.
Question 6 of 25 · Vehicle Dynamics
Why is liquid surge dangerous?
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A.
It can cause the truck to roll over
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B.
It can push the truck in the direction the wave moves
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C.
It can affect handling and braking
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D.
All of the above
Correct answer: D.
Surge can roll, push, and disrupt braking — drivers must anticipate it.
Question 7 of 25 · Loading
What's the consequence of overloading a tank?
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A.
Increased wear on tires and brakes
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B.
Possible tank rupture
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C.
Illegal weight violations
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D.
All of the above
Correct answer: D.
Overloading causes wear, legal trouble, and danger of tank failure.
Question 8 of 25 · Vehicle Dynamics
What can drivers do to control surge?
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A.
Brake gradually well before stopping
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B.
Accelerate gradually
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C.
Allow extra following distance
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D.
All of the above
Correct answer: D.
Smooth braking and acceleration, plus extra space, all help control surge.
Question 9 of 25 · Emergency Maneuvers
What's the best approach to handling a flat tire on a tanker?
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A.
Pull over safely and replace the tire or call for help
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B.
Continue driving
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C.
Drive faster to make it to the next exit
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D.
Stop in the middle of the road
Correct answer: A.
Stop safely and address the flat — driving on it can lead to bigger problems.
Question 10 of 25 · Loading
How can drivers tell if a tank is properly loaded?
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A.
Check that all compartments are filled within outage limits
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B.
Check the weight distribution
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C.
Confirm valves are closed
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D.
All of the above
Correct answer: D.
Verify outage, weight distribution, and closed valves before moving.
Question 11 of 25 · Tank Types
What is a "smooth bore" tank?
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A.
A tank with internal baffles
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B.
A tank without internal baffles or compartments
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C.
A heated tank
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D.
A two-compartment tank
Correct answer: B.
Smooth-bore tanks have no internal baffles, so liquid surge is unrestrained.
Question 12 of 25 · Adverse Conditions
What's the best practice for starting on slippery roads with a tanker?
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A.
Accelerate slowly to avoid wheel spin
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B.
Accelerate quickly
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C.
Use the lowest gear and slip clutch
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D.
Use parking brake
Correct answer: A.
Smooth, slow acceleration avoids spinning the drive tires.
Question 13 of 25 · Inspection
When checking tanks during pre-trip, what should be inspected?
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A.
Tank shell for cracks or corrosion
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B.
Manhole cover and seals
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C.
Discharge valves
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D.
All of the above
Correct answer: D.
Inspect the shell, seals, valves, and other tank components every pre-trip.
Question 14 of 25 · Operation
What's the recommended safe braking technique for tank trucks?
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A.
Apply brakes gradually well before stopping
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B.
Quick, hard braking
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C.
Use the engine retarder primarily
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D.
Brake at the last second
Correct answer: A.
Brake gradually and well in advance — sudden braking magnifies surge.
Question 15 of 25 · Vehicle Dynamics
How do drivers minimize side-to-side surge?
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A.
Avoid abrupt lane changes and turns
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B.
Take turns wide and slow
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C.
Use partial loads
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D.
Both A and B
Correct answer: D.
Smooth, slow inputs and wide turns help reduce side-to-side surge.
Question 16 of 25 · Vehicle Dynamics
What's a key safety feature in modern tankers?
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A.
Automatic emergency braking
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B.
Stability control systems
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C.
Reinforced tank shells
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D.
All of the above
Correct answer: D.
Modern tankers often combine ABS, stability control, and reinforced shells for safety.
Question 17 of 25 · CDL Rules
How are tanker drivers trained for hazardous cargo?
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A.
Same as regular drivers
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B.
They receive specialized training and may need HazMat endorsement
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C.
No specific training required
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D.
They are trained by the shipper
Correct answer: B.
Hazardous tankers require additional training and often a HazMat endorsement.
Question 18 of 25 · Loading
What is a vapor recovery system?
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A.
A way to recover heat
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B.
A system to recover vapors during loading and unloading to reduce emissions
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C.
An air brake component
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D.
A backup pump
Correct answer: B.
Vapor recovery captures vapors during transfer to limit emissions.
Question 19 of 25 · Adverse Conditions
What's the safe way to handle a tanker in heavy wind?
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A.
Slow down and grip steering firmly
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B.
Speed up to maintain control
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C.
Use the engine retarder
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D.
Lock the brakes
Correct answer: A.
High winds destabilize tankers; slow down and steer firmly.
Question 20 of 25 · Vehicle Dynamics
When is it most dangerous to brake suddenly in a tanker?
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A.
When tank is partially full
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B.
When tank is fully loaded
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C.
When tank is empty
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D.
When tank is heated
Correct answer: A.
Partial loads create the most surge during sudden braking.
Question 21 of 25 · Rail Crossings
What's the recommended safe practice when crossing railroad tracks with a tanker?
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A.
Stop within 15-50 feet of nearest rail and look and listen for trains
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B.
Speed up across the tracks
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C.
Stop on the tracks
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D.
Drive across normally
Correct answer: A.
Stop 15 to 50 feet from nearest rail. Don't shift gears while crossing.
Question 22 of 25 · Inspection
What is the proper way to inspect a tank before driving?
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A.
Check valves, manhole, and tank shell for leaks and damage
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B.
Just check the tires
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C.
Only inspect the engine
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D.
Skip inspection if you're in a hurry
Correct answer: A.
Inspect valves, manhole, shell, hoses, and other tank components every pre-trip.
Question 23 of 25 · Vehicle Dynamics
What are some hazards of driving smooth-bore tankers?
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A.
Side-to-side and forward-and-back surge
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B.
High center of gravity
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C.
Difficult handling on curves
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D.
All of the above
Correct answer: D.
Smooth-bore tanks are especially prone to surge, rollover, and difficult handling.
Question 24 of 25 · Speed Management
What is the leading cause of tanker rollover?
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A.
Driver error such as speed too high for curves
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B.
Mechanical failure
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C.
Weather only
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D.
Tire blowouts
Correct answer: A.
Speed too high for conditions, especially in curves, is the leading rollover cause.
Question 25 of 25 · Backing
What should a driver do before backing a tanker?
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A.
Check the path with a helper
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B.
Look behind the vehicle
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C.
Walk around the vehicle to check clearances
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D.
All of the above
Correct answer: D.
Use a helper, walk-around, and check the path before backing.
About the Tank Vehicles Test
The Tank Vehicles test covers inspecting tank vehicles, driving tank vehicles, surge and liquid movement, baffled and unbaffled tanks, outage, and safe driving rules unique to large liquid loads. Tank vehicles handle very differently from dry-freight vehicles because liquid surge can shove the vehicle in the direction the wave moves.
The Minnesota Driver and Vehicle Services administers this knowledge test as part of its commercial driver license program. To earn the Tank Endorsement (N) on your Minnesota CDL, you need to score at least 16 out of 20 on the official version.
Topics covered on this practice test
- Vehicle Dynamics: 7 questions
- Loading: 4 questions
- Adverse Conditions: 2 questions
- Inspection: 2 questions
- Emergencies: 1 question
- HazMat Driving: 1 question
- Emergency Equipment: 1 question
- Emergency Maneuvers: 1 question
- Tank Types: 1 question
- Operation: 1 question
- CDL Rules: 1 question
- Rail Crossings: 1 question
- Speed Management: 1 question
- Backing: 1 question
How to use this practice test
- Read each question carefully. CDL questions are written precisely — small wording differences matter.
- Click "Show Answers & Explanations" only after answering every question. Don't peek mid-test.
- Read the explanation for every question, even ones you got right. The reasoning is more important than the answer.
- Repeat the test until you score 100%. The questions are deterministic per state, so you can track your improvement over multiple sessions.
- Move on to the other endorsement tests for Minnesota until you're ready for the official exam.
Tips specific to the Tank Vehicles test
Tank vehicle questions focus on liquid surge, outage, smooth-bore versus baffled tanks, high center of gravity, and the special braking and turning techniques required to keep a partially-loaded tank under control. Expect several questions about leak response and load distribution.