Tank

This endorsement is required to haul any liquid or gaseous materials in a tank or tanks having a capacity of 1,000 gallons or more that is either permanently or temporarily attached to the vehicle or.. Read More

This endorsement is required to haul any liquid or gaseous materials in a tank or tanks having a capacity of 1,000 gallons or more that is either permanently or temporarily attached to the vehicle or chassis. To receive this endorsement, applicants must pass a test. The test consists of 20 multiple choice questions. Each question has three possible answer choices. To pass, the applicant must answer at least 16 questions correctly. Test questions come from the Iowa Commercial Driver License Manual. Questions come from chapters covering: Driving Safely, Tank Vehicles, Hazardous Materials and Combination Vehicles. The Tank endorsement can be used with the Class A, B or C CDL.

Number of Question
Passing Score

1. An Anti-Lock Braking System (ABS):

Explanation
Beginning between 1997 and 1999, most commercial vehicles, trailers, and dollies are required to be equipped with ABS.

2. When starting from a complete stop, a vehicle should:

Explanation
To avoid hitting vehicles behind you, you must ensure that your vehicle will not roll backward when you start moving forward from a stopped position.

3. If you notice a cargo leak, you should identify the leaking hazardous materials by:

Explanation
If you discover a cargo leak while transporting hazardous materials, use the shipping papers, label, or package location to identify which materials are involved. Do not try to touch or smell the leaking materials to determine what they are because doing so could result in injury or death.

4. When driving under wet conditions, a lack of spray coming from the tires of other vehicles indicates that:

Explanation
In wet conditions, a lack of spray coming from the tires of other vehicles indicates that ice has formed on the road. Be especially cautious when traveling under wet conditions in freezing weather.

5. If a vehicle is accompanied by a vehicle inspection report:

Explanation
As the first step of a vehicle inspection, a driver should review any inspection report left by the previous driver.

6. Pushing in the trailer air supply control will:

Explanation
Push in the trailer air supply control to supply the trailer with air. Pull out the trailer air supply control to turn off the air supply and activate the emergency brakes.

7. Carrying liquids in a leaking tank:

Explanation
Before operating a tank vehicle, be sure to check for any cracks or leaks in the tank. It is illegal to carry liquids or gases in a leaking tank.
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