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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. When driving at night, you should use ________ when you can.
emergency flashers
low beams
indicator lights
high beams
2. When approaching a double railroad track, you should:
expect to hear a train when it's approaching.
remember that a train on one track may hide a train on the other track.
rely upon the presence of warning signals.
remember that trains may be more frequent.
3. If you are carrying a heavy load that is slowing you down, you should:
drive in the right lane.
drive in the left lane.
drive on the shoulder.
keep the vehicle in third gear.
4. You hear a loud "bang" which sounds like a tire blowout. You should:
check the tires at the next stop.
inspect your tires with your mirrors.
assume you have a tire failure.
keep driving as normal.
5. Why should you back toward the driver's side?
Using double clutching requires practice.
You can more easily correct any steering errors.
You can see better and watch the rear of your vehicle by looking out the side window.
All of the above.
6. Your vehicle has air brakes. To stop, you should:
pump the brake pedal 3 times.
pull the parking brake control knob out.
release the accelerator, push in the clutch, and shift to Neutral at the same time.
push the brake pedal down.
7. When driving in very hot weather, you may have to:
decrease your following distance.
watch out for black ice.
increase your speed until the tires cool off.
reduce your speed to prevent overheating.
8. If a load is 50 feet long, the minimum number of tie-downs required is:
9. Empty trucks:
require a greaterĀ stopping distance than full trucks.
require the same stoppingĀ distance than full trucks.
require a shorter stoppingĀ distance than full trucks.
None of the above.
10. You should do an after-trip inspection:
at least once a week.
after each trip.
after each stop.
once a month.
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OR CDL Doubles Triples 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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