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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Oregon doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The OR CDL doubles triples test covers the following sections of the Oregon CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this OR CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Oregon.
1. As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
the service line valve close.
air escaping from the open valve.
a mechanical vibration.
a thumping sound.
2. Which of the following road surfaces freezes first?
Open roads
3. ABS:
may cause your wheels to lock when you break hard.
helps you stop faster.
helps you avoid skids caused by over braking.
improves your visibility at night.
4. Glad hands are:
warning devices.
securement devices.
coupling devices.
electronic devices.
5. For a cargo fire in a box trailer, you should:
use the fire extinguisher on the doors.
open the doors immediately and use the fire extinguisher.
keep the doors shut.
wait 10 minutes before opening the doors.
6. When driving a double or triple, you should:
drive with emergency flashers on.
increase your following distance.
decrease your following distance.
drive in the left lane whenever possible.
7. You should test the coupling by:
locking the pintle hook.
pulling against the pin of the second semitrailer.
disconnect the safety chains.
applying the parking brakes so the rig will not move.
8. When coupling double trailers, you can secure the second trailer by:
setting the trailer emergency brakes.
using the trailer spring brakes.
chocking the wheels.
All of the above.
9. When should you turn the retarder off?
when the cargo is heavy.
when the cargo is prone to shifting.
when your vehicle has a high center of gravity.
when the road is slippery.
10. Dual tires:
are dangerous.
should come in contact with each other whenever possible.
should not come in contact with each other.
should always come in contact with each other.
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Doubles Triples OR 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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