25 realistic Tank Vehicles practice questions for Wyoming 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 · Tank Types
What's a "high-volume" tank?
-
A.
A tank with capacity greater than typical
-
B.
A tank with high pressure
-
C.
A tank with multiple compartments
-
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 2 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 3 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.
Question 4 of 25 · Operation
What's the recommended safe braking technique for tank trucks?
-
A.
Apply brakes gradually well before stopping
-
B.
Quick, hard braking
-
C.
Use the engine retarder primarily
-
D.
Brake at the last second
Correct answer: A.
Brake gradually and well in advance — sudden braking magnifies surge.
Question 5 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 6 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 7 of 25 · Tank Types
What's a key difference between compartmented and smooth-bore tanks?
-
A.
Compartmented tanks reduce surge between sections
-
B.
Smooth-bore tanks have less surge
-
C.
They are the same in terms of surge
-
D.
Compartmented tanks are always larger
Correct answer: A.
Compartmented tanks reduce overall surge by limiting movement to each section.
Question 8 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 9 of 25 · Adverse Conditions
What's the best practice for starting on slippery roads with a tanker?
-
A.
Accelerate slowly to avoid wheel spin
-
B.
Accelerate quickly
-
C.
Use the lowest gear and slip clutch
-
D.
Use parking brake
Correct answer: A.
Smooth, slow acceleration avoids spinning the drive tires.
Question 10 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 11 of 25 · Speed Management
What should you do when going around curves with a tanker?
-
A.
Slow down well below the posted speed
-
B.
Drive at the posted speed limit
-
C.
Use the engine retarder
-
D.
Lock the brakes
Correct answer: A.
Take curves at speeds well below the posted limit to avoid rollovers.
Question 12 of 25 · Vehicle Dynamics
How does liquid weight affect handling?
-
A.
It changes the center of gravity
-
B.
It affects acceleration
-
C.
It affects braking
-
D.
All of the above
Correct answer: D.
Liquid loads alter CG and dramatically affect acceleration and braking.
Question 13 of 25 · Adverse Conditions
What's the safe way to handle a tanker on icy roads?
-
A.
Slow down and increase following distance
-
B.
Use chains if required
-
C.
Avoid sudden braking and steering
-
D.
All of the above
Correct answer: D.
Reduced speed, chains where required, and smooth inputs reduce risk on ice.
Question 14 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 15 of 25 · Vehicle Dynamics
Why must drivers be especially careful when starting and stopping a tanker?
-
A.
Surge can cause loss of control
-
B.
Engine torque is too high
-
C.
Brakes are weaker
-
D.
Steering is harder
Correct answer: A.
Surge during starts and stops can shove the vehicle and cause loss of control.
Question 16 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 17 of 25 · Speed Management
When should tank drivers especially reduce speed?
-
A.
On wet or slippery roads
-
B.
On curves
-
C.
On ramps
-
D.
All of the above
Correct answer: D.
Slow down on wet roads, curves, and ramps — all increase rollover risk.
Question 18 of 25 · Tank Types
What is the purpose of internal baffles?
-
A.
To reduce side-to-side surge
-
B.
To reduce forward and back surge
-
C.
To prevent leaks
-
D.
To increase tank size
Correct answer: B.
Baffles reduce front-to-back surge but do not stop side-to-side surge.
Question 19 of 25 · Inspection
What's the importance of the tank shell's integrity?
-
A.
It contains the cargo and prevents leaks
-
B.
It supports the chassis
-
C.
It absorbs shock
-
D.
It connects to the brakes
Correct answer: A.
A sound tank shell prevents leaks and contains pressure from the cargo.
Question 20 of 25 · Vehicle Dynamics
Why is liquid surge dangerous?
-
A.
It can cause the truck to roll over
-
B.
It can push the truck in the direction the wave moves
-
C.
It can affect handling and braking
-
D.
All of the above
Correct answer: D.
Surge can roll, push, and disrupt braking — drivers must anticipate it.
Question 21 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 22 of 25 · Mountain Driving
What's the proper way to handle a tanker on a steep downgrade?
-
A.
Use lower gears and engine braking with intermittent service brake
-
B.
Coast in neutral
-
C.
Brake hard the whole way
-
D.
Use the parking brake
Correct answer: A.
Lower gears and engine braking; use service brakes intermittently to avoid overheating.
Question 23 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 24 of 25 · Loading
How can drivers tell if a tank is properly loaded?
-
A.
Check that all compartments are filled within outage limits
-
B.
Check the weight distribution
-
C.
Confirm valves are closed
-
D.
All of the above
Correct answer: D.
Verify outage, weight distribution, and closed valves before moving.
Question 25 of 25 · Mountain Driving
How do drivers control speed on downgrades with tankers?
-
A.
Use lower gears and engine braking
-
B.
Use service brakes only
-
C.
Coast with no brakes
-
D.
Use parking brake
Correct answer: A.
Use proper low gears and engine braking; service brakes only intermittently.
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 Wyoming Driver Services administers this knowledge test as part of its commercial driver license program. To earn the Tank Endorsement (N) on your Wyoming CDL, you need to score at least 16 out of 20 on the official version.
Topics covered on this practice test
- Vehicle Dynamics: 6 questions
- Loading: 4 questions
- Tank Types: 3 questions
- Adverse Conditions: 2 questions
- Speed Management: 2 questions
- Inspection: 2 questions
- Mountain Driving: 2 questions
- HazMat Driving: 1 question
- Operation: 1 question
- Rail Crossings: 1 question
- Parking: 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 Wyoming 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.