Cargo Tank Hazmat Safety - ONLINE CDL SCHOOL

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Cargo Tank Hazmat Safety

Build confidence with 10 original questions about Cargo Tank Hazmat Safety. Review your answers and explanations after finishing.

Supplemental study practice. This is not a government licensing exam or ELDT certification, and does not replace hands-on training. Follow your state’s current handbook.

1 / 10

While loading hazardous materials into a cargo tank, what is required regarding the vehicle’s engine?

Turn off the engine unless it is needed to operate a pump

Disconnect the battery

Keep the engine running at all times

Rev the engine periodically

2 / 10

You are supervising the loading of a cargo tank with hazardous materials. What is one of your responsibilities in case of an emergency?

Know the procedures to follow in an emergency

Wait for law enforcement to arrive

Leave the area immediately

Call the shipper for instructions

3 / 10

You are preparing to move a cargo tank after loading hazardous materials. What must you do regarding manholes and valves, regardless of the amount or distance?

Open all covers to check for leaks during transit

Close all manholes and valves to prevent leaks

Leave valves open for ventilation

Only close the manholes if the tank is full

4 / 10

You are supervising the unloading of a cargo tank containing hazardous materials. What is a key requirement for your position during this process?

Remain within 25 feet of the cargo tank and be able to move it if needed

Monitor the process from a remote camera

Stay inside the cab with the engine running at all times

Delegate supervision to an untrained assistant

5 / 10

A portable tank with a capacity of 800 gallons is loaded with hazardous materials. How tall must the shipping name letters be on the tank?

At least three inches tall

At least four inches tall

At least one inch tall

At least two inches tall

6 / 10

You are preparing to move a cargo tank that is not completely empty. What is the legal requirement regarding open valves or covers?

It is illegal to move a cargo tank with open valves or covers unless it is empty according to 49 CFR 173.29

You only need to close the covers, not the valves

You may move the tank as long as it is less than half full

Open valves are allowed if the distance is short

7 / 10

You are about to fill a cargo tank with flammable liquid using an open filling hole. What must you do before opening the hole?

Open all manholes for ventilation

Properly ground the cargo tank

Turn on the cargo heater

Check the tire pressure

8 / 10

You are unloading a cargo tank of compressed gas. When should you close the liquid discharge valves?

Open them whenever the engine is running

Leave them open until the tank is empty

Close them only after moving the tank

Keep them closed except when loading or unloading

9 / 10

A portable tank containing hazardous materials is loaded onto your vehicle, but the identification numbers are not visible. What must you do?

Notify the shipper and proceed without numbers

Cover the tank with a tarp

Place a warning sign in the cab only

Display the identification number on both sides and ends of the motor vehicle

10 / 10

You are supervising hazardous materials loading or unloading. What must you do to properly attend the operation?

Remain inside the facility office

Be alert and have a clear view of the cargo tank

Delegate supervision to a person unfamiliar with the hazards

Monitor the process by video only

Your score is

The average score is 0%

About the Cargo Tank Hazmat Safety practice quiz

This practice quiz focuses on Cargo Tank Hazmat Safety, listed under CDL Practice — Hazardous Materials. Use it to check what you understand, spot topics to revisit, and connect the material to safe, informed decisions on the road.

Before you begin

Keep your current CDL manual or course notes nearby. Read each prompt carefully and think through why an answer fits, especially when a question describes a vehicle, road, or workplace situation. Licensing rules and procedures can vary, so confirm requirements with current official materials for your state.

After you finish

Review any explanations shown with your results. Note unfamiliar terms or missed concepts, then revisit your manual or course notes before trying again. Use your score to guide study; understanding why an answer is correct matters more than the number alone.

Study note: These quizzes are independent study practice. They are not state licensing exams, official government materials, or ELDT certification, and they do not replace required training.

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