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The tanker endorsement applies to drivers who wish to drive a tank in Class A, B, or C CDL. To add this endorsement to your CLP/CDL, you must pass a knowledge test on the problems posed by large volume liquid cargos. The Oregon CDL tank vehicles test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The OR tanker test covers the following sections of the Oregon CDL Manual: Driving Safely, Combination Vehicles, Tank Vehicles, Hazardous Materials. Take this OR tanker practice test now to prepare for the actual test!
1. Watch out for black ice:
when the temperature is above freezing and the road is dry.
when it is snowing.
any time the temperature is below freezing and the road looks wet.
right after it starts to rain.
2. If you are being tailgated, you should:
turn on your taillights.
increase your speed very gradually.
open up room in front of you.
make quick changes.
3. Tank vehicles have a high center of gravity, which means:
they are less likely to roll over.
they are more likely to roll over.
they are very stable.
they have more traction.
4. To avoid blinding others, you should dim your lights within _____  of an oncoming vehicle.
None of the above.
5. When inspecting tanks, which of the following is the most important thing you should check for?
Exhaust pipes
6. Older trailers do not have spring brakes. If the air supply leaks away:
there will be no emergency brakes.
the ABS won't work properly.
the trailer will stop normally.
All of the above.
7. Texting is:
the most dangerous distraction.
safer than talking on a cell phone.
about as safe as adjusting the radio.
safer than  engaging in conversation with a passenger.
8. If a drawbridge does not have a signal light or traffic control attendant, you should:
get through the drawbridge as quickly as possible.
stop and look to make sure the draw is completely closed before crossing.
drive through the drawbridge with caution.
stop at least 5 feet before the draw of the bridge.
9. If a shipping paper describes both hazardous and non-hazardous products, the hazardous materials must be:
listed at the bottom.
listed in yellow ink.
in the same color as the non-hazardous materials.
highlighted in a contrasting color.
10. Never drive a tank vehicle:
with open valves or manhole covers.
with valves or manhole covers.
with closed valves or manhole covers.
None of the above.
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OR CDL Tanker Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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