25 realistic Tank Vehicles practice questions for Indiana 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 · 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 2 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 3 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 4 of 25 · Tank Types
What's a key difference between compartmented and smooth-bore tanks?
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A.
Compartmented tanks reduce surge between sections
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B.
Smooth-bore tanks have less surge
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C.
They are the same in terms of surge
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D.
Compartmented tanks are always larger
Correct answer: A.
Compartmented tanks reduce overall surge by limiting movement to each section.
Question 5 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 6 of 25 · Adverse Conditions
What's the safe way to handle a tanker on icy roads?
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A.
Slow down and increase following distance
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B.
Use chains if required
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C.
Avoid sudden braking and steering
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D.
All of the above
Correct answer: D.
Reduced speed, chains where required, and smooth inputs reduce risk on ice.
Question 7 of 25 · Vehicle Dynamics
Why are tank vehicles often top-heavy?
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A.
The cargo is dense
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B.
The cargo's liquid weight rises with the tank shape
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C.
They have raised cargo platforms
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D.
The center of gravity is high due to liquid load
Correct answer: D.
Tank vehicles tend to have a high center of gravity, making them prone to rollover.
Question 8 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 9 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 10 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 11 of 25 · Loading
Why is it important not to overload tank vehicles?
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A.
Overloading exceeds weight limits
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B.
It increases risk of tank rupture
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C.
It changes vehicle handling
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D.
All of the above
Correct answer: D.
Overloading is illegal and unsafe; it changes handling and stresses the tank.
Question 12 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 13 of 25 · Loading
What is "outage" in tank operations?
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A.
Lost electricity
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B.
Empty space allowed in a tank for liquid to expand
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C.
Tank failure
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D.
Loss of brake pressure
Correct answer: B.
Liquids expand with heat. Outage is the empty space left for that expansion.
Question 14 of 25 · Inspection
What's the importance of regular maintenance for tank vehicles?
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A.
Prevents leaks
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B.
Ensures safe operation
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C.
Identifies problems before failures
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D.
All of the above
Correct answer: D.
Routine maintenance prevents leaks, failures, and unsafe operation.
Question 15 of 25 · Tank Types
What is the purpose of internal baffles?
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A.
To reduce side-to-side surge
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B.
To reduce forward and back surge
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C.
To prevent leaks
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D.
To increase tank size
Correct answer: B.
Baffles reduce front-to-back surge but do not stop side-to-side surge.
Question 16 of 25 · Tank Types
What's a "high-volume" tank?
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A.
A tank with capacity greater than typical
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B.
A tank with high pressure
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C.
A tank with multiple compartments
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D.
A tank with a smooth interior
Correct answer: A.
High-volume tanks carry more than typical loads and are subject to special rules.
Question 17 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 18 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 19 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 20 of 25 · Mountain Driving
What's the proper way to handle a tanker on a steep downgrade?
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A.
Use lower gears and engine braking with intermittent service brake
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B.
Coast in neutral
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C.
Brake hard the whole way
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D.
Use the parking brake
Correct answer: A.
Lower gears and engine braking; use service brakes intermittently to avoid overheating.
Question 21 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 22 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 23 of 25 · Parking
What's the safest place to park a tank vehicle overnight?
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A.
Designated truck parking areas away from buildings
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B.
On the highway shoulder
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C.
In residential areas
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D.
Anywhere with lighting
Correct answer: A.
Use designated truck parking areas away from people and buildings.
Question 24 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 25 of 25 · Placards
Why are tankers required to have specific markings?
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A.
To identify the cargo and any hazards
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B.
To make them more visible
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C.
For tax purposes
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D.
For insurance only
Correct answer: A.
Markings identify cargo and any hazards for emergency responders and others.
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 Indiana Bureau of Motor Vehicles administers this knowledge test as part of its commercial driver license program. To earn the Tank Endorsement (N) on your Indiana CDL, you need to score at least 16 out of 20 on the official version.
Topics covered on this practice test
- Vehicle Dynamics: 4 questions
- Tank Types: 4 questions
- Loading: 3 questions
- Inspection: 3 questions
- Adverse Conditions: 2 questions
- Emergency Maneuvers: 1 question
- Rail Crossings: 1 question
- Emergencies: 1 question
- Emergency Equipment: 1 question
- HazMat Driving: 1 question
- Mountain Driving: 1 question
- Speed Management: 1 question
- Parking: 1 question
- Placards: 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 Indiana 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.