Practice Exam Questions And Correct

CDL Tank Vehicle (N) Endorsement Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the main reason tank vehicles have special handling

requirements?

• They are heavier than normal trucks
• They carry liquids that can shift and affect stability
• They require more fuel
• They have automatic transmissions

Rationale: Liquid cargo can move inside the tank, causing surge that

affects vehicle control.

• When inspecting a tank vehicle, you notice a small leak in the tank.

What should you do?

• Continue driving carefully 1 / 4

• Do not operate the vehicle and report the leak immediately
• Patch it temporarily with tape
• Wait until the end of the route

Rationale: Leaks can cause hazardous situations; tanks must be

repaired before operation.

• What is “liquid surge” in a tank vehicle?
• The increase in fuel consumption
• The movement of liquid inside the tank during acceleration or

braking

• The increase in engine power
• The effect of wind on the vehicle

Rationale: Liquid surge can shift the vehicle’s center of gravity,

making it harder to control.

• Which type of tank requires special care because it can be affected by

temperature changes?

• Dry van
• Liquid bulk tanks
• Flatbed trailers
• Refrigerated trailers

Rationale: Liquids expand and contract with temperature, affecting

pressure and weight distribution.

• Before transporting hazardous liquids, you must ensure the tank

vehicle is: 2 / 4

• Washed only inside
• Clean and free of incompatible residues
• Loaded with ice
• Painted bright colors

Rationale: Residue from previous loads can react dangerously with

new cargo.

• How should you enter a curve when driving a tank vehicle?
• Speed up
• Brake sharply in the curve
• Slow down before entering and steer smoothly
• Shift to neutral

Rationale: Sudden movements can cause liquids to surge, risking

rollover.

• What is a baffle in a tank?
• A device that measures liquid temperature
• A barrier inside the tank that reduces liquid surge
• A valve for unloading
• A ladder on the tank

Rationale: Baffles help reduce the movement of liquid, improving

stability.

• When filling a tank, you notice the liquid starts to foam. What should

you do?

• Stop filling immediately 3 / 4

• Reduce the fill rate to prevent overfilling and foam overflow
• Add water
• Ignore it

Rationale: Foam can expand and overflow, causing spills and

hazards.

• Why must you be careful when braking in a loaded tank truck?
• The brakes are weaker than usual
• Liquid movement can push the truck forward or backward
• It will increase fuel consumption
• The horn may not work

Rationale: Sloshing liquids can affect stopping distance and control.

• Which factor increases the risk of rollovers in tank vehicles?
• Using cruise control
• Driving in fog
• High center of gravity from liquid cargo
• Driving downhill

Rationale: A high center of gravity makes the vehicle more prone to

tipping during turns or sudden maneuvers.

• When unloading a tank, why should you open valves slowly?
• To save time
• To avoid noise
• To prevent pressure surges and splashing
• To prevent the tank from cooling
• / 4