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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. When should you downshift automatic transmissions?
Watch your tachometer, and downshift when your engine reaches the top of the range.
When you start to get drowsy.
When going down steep grades.
When you want to go faster.
2. Strong winds can make it difficult to stay in your lane, especially when:
going into tunnels.
coming out of tunnels.
driving at speeds below 40 mph.
driving alongside other vehicles.
3. What is the main difference between portable tanks and cargo tanks?
The product is loaded or unloaded while the portable tanks are off the vehicle.
Portable tanks are not permanently attached to a vehicle.
Portable tanks must show the lessee or owner’s name.
All of the above.
4. The tractor protection valve:
keeps air from going out if the air compressor develops a leak.
keeps your wheels from locking up when you brake hard.
keeps air in the brake system should the trailer develop a bad leak.
prevents the trailer from being accidentally released.
5. You had to drive onto the right shoulder to avoid a crash. You are now driving at 40 mph on the shoulder. How should you move back onto the pavement?
If the shoulder is clear, stay on it until your vehicle has come to a stop, then move back onto the pavement when it is safe.
Keep moving at the present speed and steer very gently back onto the pavement.
Brake hard to slow the vehicle, then steer sharply onto the pavement.
None of the above.
6. If a trailer does not have spring brakes, to keep the trailer from moving you should:
use the service brakes.
park on a slight decline.
close the brake valve.
use wheel chocks.
7. To prevent rollover, you should:
place the cargo near the front of the trailer.
place the cargo near the rear of the trailer.
put the lightest parts of the cargo under the heaviest parts.
keep the cargo as close to the ground as possible.
8. When fueling a vehicle containing hazardous materials, you should:
turn off the engine.
leave the engine on.
leave the nozzle unattended.
call your supervisor.
9. When backing a trailer, you should turn the steering wheel to the right to make the trailer go left (or vice versa). Once the trailer starts to turn, you should:
turn the wheel more  in the direction you want to go.
turn the wheel the other way to follow the trailer.
keep backing up.
None of the above.
10. When parked on the side of the road, you should:
turn off all lights.
flash your brake lights.
activate the right turn signal.
use the 4-way emergency flashers.
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OR CDL Tanker Endorsement

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