25 realistic Tank Vehicles practice questions for Nebraska 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?
-
A.
Brake gradually well before stopping
-
B.
Accelerate gradually
-
C.
Allow extra following distance
-
D.
All of the above
Correct answer: D.
Smooth braking and acceleration, plus extra space, all help control surge.
Question 2 of 25 · Loading
When loading tanks, what must drivers consider?
-
A.
Outage requirements for the liquid
-
B.
Weight distribution between compartments
-
C.
Surge potential
-
D.
All of the above
Correct answer: D.
Outage, weight distribution, and surge management all matter when loading tanks.
Question 3 of 25 · Inspection
Why must drivers check the discharge valve before driving?
-
A.
To verify it is closed and not leaking
-
B.
To allow ventilation
-
C.
To start the engine
-
D.
To engage the brakes
Correct answer: A.
Discharge valves must be closed and leak-free before driving.
Question 4 of 25 · Parking
What's the safest place to park a tank vehicle overnight?
-
A.
Designated truck parking areas away from buildings
-
B.
On the highway shoulder
-
C.
In residential areas
-
D.
Anywhere with lighting
Correct answer: A.
Use designated truck parking areas away from people and buildings.
Question 5 of 25 · Vehicle Dynamics
How do drivers minimize side-to-side surge?
-
A.
Avoid abrupt lane changes and turns
-
B.
Take turns wide and slow
-
C.
Use partial loads
-
D.
Both A and B
Correct answer: D.
Smooth, slow inputs and wide turns help reduce side-to-side surge.
Question 6 of 25 · Vehicle Dynamics
Why is the high center of gravity dangerous?
-
A.
It increases rollover risk
-
B.
It makes the vehicle more aerodynamic
-
C.
It improves traction
-
D.
It reduces braking force
Correct answer: A.
A high CG raises rollover risk, especially in turns or sudden maneuvers.
Question 7 of 25 · Loading
What is a vapor recovery system?
-
A.
A way to recover heat
-
B.
A system to recover vapors during loading and unloading to reduce emissions
-
C.
An air brake component
-
D.
A backup pump
Correct answer: B.
Vapor recovery captures vapors during transfer to limit emissions.
Question 8 of 25 · Inspection
How can drivers detect a tank leak?
-
A.
Visual inspection during pre-trip and en-route stops
-
B.
Smell of the cargo
-
C.
Sound of escaping fluid
-
D.
All of the above
Correct answer: D.
Sight, smell, and sound can all help detect leaks. Inspect at every stop.
Question 9 of 25 · Vehicle Dynamics
What's a key safety feature in modern tankers?
-
A.
Automatic emergency braking
-
B.
Stability control systems
-
C.
Reinforced tank shells
-
D.
All of the above
Correct answer: D.
Modern tankers often combine ABS, stability control, and reinforced shells for safety.
Question 10 of 25 · Loading
Why must tanker drivers be careful when refueling?
-
A.
Risk of fire from spills
-
B.
Risk of cargo contamination
-
C.
Risk of overloading
-
D.
Both A and B
Correct answer: D.
Spills can ignite and cargo can be contaminated by fuel.
Question 11 of 25 · Loading
Why is it important not to overload tank vehicles?
-
A.
Overloading exceeds weight limits
-
B.
It increases risk of tank rupture
-
C.
It changes vehicle handling
-
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?
-
A.
Stop within 15-50 feet of nearest rail and look and listen for trains
-
B.
Speed up across the tracks
-
C.
Stop on the tracks
-
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 · Adverse Conditions
What's the safe way to handle a tanker in heavy wind?
-
A.
Slow down and grip steering firmly
-
B.
Speed up to maintain control
-
C.
Use the engine retarder
-
D.
Lock the brakes
Correct answer: A.
High winds destabilize tankers; slow down and steer firmly.
Question 14 of 25 · Tank Types
What is "compartmented tanks"?
-
A.
Tanks split into multiple sections
-
B.
Tanks made for grain
-
C.
Tanks made for hazardous materials only
-
D.
Tanks with one large interior
Correct answer: A.
Compartmented tanks have multiple sections so different liquids can be carried separately.
Question 15 of 25 · Loading
What is "outage" in tank operations?
-
A.
Lost electricity
-
B.
Empty space allowed in a tank for liquid to expand
-
C.
Tank failure
-
D.
Loss of brake pressure
Correct answer: B.
Liquids expand with heat. Outage is the empty space left for that expansion.
Question 16 of 25 · Emergency Equipment
What equipment must be on a HazMat tank vehicle?
-
A.
Emergency response equipment
-
B.
Spill kits as required
-
C.
Communication devices
-
D.
All of the above
Correct answer: D.
Carry spill response gear, communication, and any other required equipment.
Question 17 of 25 · Vehicle Dynamics
What's the most important thing to remember about driving a tanker?
-
A.
Be aware of liquid surge and high center of gravity
-
B.
Drive faster to maintain schedule
-
C.
Skip pre-trip inspections
-
D.
Ignore weather conditions
Correct answer: A.
Surge and CG awareness are the cornerstones of safe tanker driving.
Question 18 of 25 · Placards
What's the role of the tanker placard?
-
A.
To identify cargo for emergency responders
-
B.
To indicate the vehicle is heavy
-
C.
To indicate the vehicle is restricted
-
D.
To warn of slow speed
Correct answer: A.
Placards identify cargo, alerting first responders to the type of hazard.
Question 19 of 25 · Vehicle Dynamics
When is liquid surge greatest?
-
A.
When tanks are full
-
B.
When tanks are partially full
-
C.
When tanks are empty
-
D.
When tanks are heated
Correct answer: B.
Surge is greatest when tanks are partially full and the liquid can move freely.
Question 20 of 25 · Loading
What is "outage" requirement for liquids that expand a lot?
-
A.
Larger outage required
-
B.
Less outage required
-
C.
No outage required
-
D.
Outage doesn't depend on the liquid
Correct answer: A.
Liquids that expand more (e.g., LPG) require greater outage in the tank.
Question 21 of 25 · Vehicle Dynamics
What can cause a tanker to roll over?
-
A.
Sharp turns
-
B.
Sudden steering corrections
-
C.
Speed too high for road conditions
-
D.
All of the above
Correct answer: D.
All of these can cause rollovers; smooth, slow inputs reduce risk.
Question 22 of 25 · Vehicle Dynamics
What are some hazards of driving smooth-bore tankers?
-
A.
Side-to-side and forward-and-back surge
-
B.
High center of gravity
-
C.
Difficult handling on curves
-
D.
All of the above
Correct answer: D.
Smooth-bore tanks are especially prone to surge, rollover, and difficult handling.
Question 23 of 25 · Vehicle Dynamics
How can drivers prevent tanker rollover?
-
A.
Reduce speed in curves and ramps
-
B.
Avoid sudden steering
-
C.
Maintain proper load and securement
-
D.
All of the above
Correct answer: D.
Slow speed, smooth steering, and proper loading all help prevent rollovers.
Question 24 of 25 · Emergencies
What action should a driver take if a tank starts to leak?
-
A.
Stop immediately in a safe area and report the leak
-
B.
Continue to destination
-
C.
Try to close the leak
-
D.
Drive faster
Correct answer: A.
Stop in a safe area, secure the area, and notify the carrier and emergency services.
Question 25 of 25 · HazMat Driving
Why is "no smoking" enforced near tankers?
-
A.
Risk of fire and explosion from cargo vapors
-
B.
Cleanliness
-
C.
Tradition
-
D.
OSHA rules only
Correct answer: A.
Vapors can ignite or explode; smoking is prohibited near tankers.
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 Nebraska Department of Motor Vehicles administers this knowledge test as part of its commercial driver license program. To earn the Tank Endorsement (N) on your Nebraska CDL, you need to score at least 16 out of 20 on the official version.
Topics covered on this practice test
- Vehicle Dynamics: 9 questions
- Loading: 6 questions
- Inspection: 2 questions
- Parking: 1 question
- Rail Crossings: 1 question
- Adverse Conditions: 1 question
- Tank Types: 1 question
- Emergency Equipment: 1 question
- Placards: 1 question
- Emergencies: 1 question
- HazMat Driving: 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 Nebraska 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.