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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 Oklahoma doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The OK CDL doubles triples test covers the following sections of the Oklahoma CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this OK CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Oklahoma.
1. The weight of a truck:
does not influence stopping distance.
is not as important as the vehicle's center of gravity in determining stopping distance.
has no impact on stopping distance.
2. Your vehicle has air brakes. To stop, you should:
release the accelerator, push in the clutch, and shift to Neutral at the same time.
push the brake pedal down.
pull the parking brake control knob out.
3. With an engine fire, you should:
open the hood as soon as possible.
not shoot foam from the vehicle’s underside.
turn the engine off as soon as possible.
4. When coupling a double or triple, ________ should be attached last.
the trailer right behind the cab.
the middle trailer.
None of the above.
5. You should always adjust your speed to be able to stop within:
the length of your vehicle.
the distance you can see ahead.
50 feet.
6. When you back under a trailer:
back the tractor slowly.
use lowest reverse gear.
All of the above.
7. You should test the coupling by:
locking the pintle hook.
pulling against the pin of the second semitrailer.
applying the parking brakes so the rig will not move.
8. You hear a loud "bang" which sounds like a tire blowout. You should:
check the tires at the next stop.
assume you have a tire failure.
keep driving as normal.
9. The posted speed limit for a curve:
is safe for trucks or buses, but it may be too fast for cars.
may be too fast for many trucks or buses.
is safe for all vehicles.
10. Strong winds can make it difficult to stay in your lane, especially when:
coming out of tunnels.
driving at speeds below 40 mph.
going into tunnels.
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OK 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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