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Iowa CDL Permit Test - Tank

(From the 2021 Iowa CDL driver handbook)
Number of questions: 20
Passing score: 16
Directions: 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.
You have made error so far
Passing grade —
4 or fewer errors

Skids caused by over-acceleration can usually be resolved by:

Removing your foot from the accelerator.
Swerving to the right.

An example of required emergency equipment is:

A spare electrical fuse.
A loud horn.
A battery-operated flashlight.

When a vehicle is started, the coolant temperature should:

Rise slowly.
Jump quickly.

If you are driving in fog, you should not:

Turn on the four-way flashers.
Slow down.
Use your high beam lights.

One way to prevent a surge is to:

Brake in well advance, eliminating sudden stops.
Accelerate quickly.
Drive below the speed limit.

A driver operating a tank equipped with baffles should be particularly wary of:

Front-to-back surge.
Side-to-side surge.
End-to-end surge.

Steering wheel play of more than ____ can make steering difficult.

10 degrees
25 degrees
50 degrees
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