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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. If your brakes fail on a steep mountain downgrade, you should:
slow down until your vehicle comes to a complete stop.
set the parking brake and park in an open area.
stay on the road and keep looking for the next available escape ramp.
decide what to do as soon as you know your brakes do not work.
2. Tank vehicles:
have a low center of gravity.
are easier to control than most other vehicles.
require less space for stopping and turning than most other vehicles.
have a high center of gravity.
3. Under a pressurized system, the radiator cap:
should never be hot.
should never be removed until the system has cooled.
should be removed when the coolant is hot.
should always be cool.
4. Empty trucks require greater stopping distances. True or False?
True, but only on wet surfaces.
False, but only for trucks built on or after March 1, 1998.
5. Forward-and-back liquid surge is very strong in:
dry tanks.
baffled tanks.
unbaffled tanks.
All of the above.
6. Which of the following statements about backing heavy vehicles is true?
The helper should stand where you cannot see the helper.
Always back as quickly as possible.
You should avoid backing whenever you can.
Back to the right side so that you can see better.
7. One reason parked delivery trucks can present a hazard is:
packages may fall out of the truck.
their drivers are often in a hurry and may suddenly step out of their vehicle.
they are often hard to see.
All of the above.
8. On any upgrade, gravity:
speed you up.
doubles your speed.
doesn't affect your speed.
slows you down.
9. The trailer hand valve should be used:
only in an emergency.
only to test the trailer brakes.
only when applying the brakes hard.
only on slippery surfaces.
10. What should you do if you doubt you have safe space to pass under a low bridge?
Assume that the height posted at the bridges is correct.
Go slowly, and take another route if you are not sure you can make it.
If no warnings are posted, assume there is enough clearance under the bridge and proceed slowly.
Increase the weight of your vehicle to clearing under the bridge.
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OR Tanker CDL Test

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