25 realistic Tank Vehicles practice questions for Montana 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 · 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 2 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 3 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 4 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 5 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 6 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 7 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 8 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 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 · 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 11 of 25 · Loading
What's the consequence of overloading a tank?
-
A.
Increased wear on tires and brakes
-
B.
Possible tank rupture
-
C.
Illegal weight violations
-
D.
All of the above
Correct answer: D.
Overloading causes wear, legal trouble, and danger of tank failure.
Question 12 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 13 of 25 · Tank Types
What is a baffled tank?
-
A.
A tank with internal walls that have holes to slow surge
-
B.
A tank with separate compartments
-
C.
A tank with a smooth interior
-
D.
A tank with no walls inside
Correct answer: A.
Baffles slow forward and back surge, but not side-to-side surge.
Question 14 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 15 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 16 of 25 · Speed Management
What is the leading cause of tanker rollover?
-
A.
Driver error such as speed too high for curves
-
B.
Mechanical failure
-
C.
Weather only
-
D.
Tire blowouts
Correct answer: A.
Speed too high for conditions, especially in curves, is the leading rollover cause.
Question 17 of 25 · Inspection
What is the proper way to inspect a tank before driving?
-
A.
Check valves, manhole, and tank shell for leaks and damage
-
B.
Just check the tires
-
C.
Only inspect the engine
-
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 18 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 19 of 25 · CDL Rules
How are tanker drivers trained for hazardous cargo?
-
A.
Same as regular drivers
-
B.
They receive specialized training and may need HazMat endorsement
-
C.
No specific training required
-
D.
They are trained by the shipper
Correct answer: B.
Hazardous tankers require additional training and often a HazMat endorsement.
Question 20 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 21 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 22 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 23 of 25 · Inspection
What's the importance of regular maintenance for tank vehicles?
-
A.
Prevents leaks
-
B.
Ensures safe operation
-
C.
Identifies problems before failures
-
D.
All of the above
Correct answer: D.
Routine maintenance prevents leaks, failures, and unsafe operation.
Question 24 of 25 · Vehicle Dynamics
When is it most dangerous to brake suddenly in a tanker?
-
A.
When tank is partially full
-
B.
When tank is fully loaded
-
C.
When tank is empty
-
D.
When tank is heated
Correct answer: A.
Partial loads create the most surge during sudden braking.
Question 25 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.
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 Montana Motor Vehicle Division administers this knowledge test as part of its commercial driver license program. To earn the Tank Endorsement (N) on your Montana CDL, you need to score at least 16 out of 20 on the official version.
Topics covered on this practice test
- Inspection: 5 questions
- Loading: 4 questions
- Adverse Conditions: 3 questions
- Tank Types: 3 questions
- Vehicle Dynamics: 2 questions
- Speed Management: 2 questions
- Mountain Driving: 1 question
- HazMat Driving: 1 question
- Placards: 1 question
- CDL Rules: 1 question
- Parking: 1 question
- Rail Crossings: 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 Montana 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.