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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 Wyoming doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The WY CDL doubles triples test covers the following sections of the Wyoming CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this WY CDL practice test now to prepare for the actual test!
1. Blocking and bracing are:
driving techniques used to regain control when your drive wheels start to skid.
coupling devices used to connect the service air lines from the truck or tractor to the trailer.
used to keep cargo from sliding and to prevent movement of cargo.
None of the above.
2. Regardless of its size, cargo should have at least ___ tie-downs.
3. When the wheels of a trailer lock up, which of the following is most likely to occur?
The trailer will the trailer has overturn.
The trailer will tend to swing around (trailer jackknife).
The rig will stay in a straight line but slide sideways.
The trailer will tend to push the towing vehicle sideways (tractor jackknife).
4. In your mirror, you see a car approaching from the rear. The next time you check your mirror, you don't see the car. If you wish to change lanes, you should:
assume the car left the roadway and change lanes as normal.
wait until you are sure the car isn't in your blind spot.
ease into the other lane slowly so the other car can get out of the way.
None of the above.
5. When driving on slippery roads, you should NOT:
use the engine brake.
go slowly.
watch far enough ahead to keep a steady speed.
try to anticipate stops early.
6. Which of the following statements about retarders is NOT correct?
Retarders reduce reduce brake wear.
Retarders help you avoid skids.
You should turn the retarder off whenever the road is wet, icy, or snow covered.
Retarders help slow a vehicle, reducing the need for using brakes.
7. When going down grades, you should:
shift up.
put the transmission in Neutral.
rely solely on engine braking to reduce your speed.
downshift to a lower gear.
8. When preparing to make a right turn, you should NOT turn wide to the left as you start the turn. Why?
It makes the turn harder.
A following driver may try to pass you on the right.
A following driver may try to pass you on the left.
Turning wide to the left can cause your vehicle to tilt.
9. Alcohol:
impairs depth perception.
improves reaction time.
improves muscle coordination.
does not affect judgement.
10. Your mirrors should be adjusted so that:
the rear of the vehicle is visible in the mirror.
more than half of the mirror shows the vehicle.
no part of the vehicle is visible in the mirror.
a part of the vehicle is visible in the mirror.
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WY 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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