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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 New Jersey doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The NJ CDL doubles triples test covers the following sections of the New Jersey CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this NJ CDL practice test now to prepare for the actual test!
1. Front-end header boards:
protect drivers from cargo in case of an accident or emergency stop.
protect drivers from spilled cargo.
reduce traction.
should never be used.
2. When your vehicle starts to skid, you must take action to:
accelerate and countersteer.
use controlled braking.
use stab braking.
restore traction to the tires.
3. If your brakes fail on a steep mountain downgrade, you should:
stay on the road and keep looking for the next available escape ramp.
decide what to do as soon as you know your brakes do not work.
set the parking brake and park in an open area.
slow down until your vehicle comes to a complete stop.
4. When you turn suddenly while pulling doubles, which trailer is most likely to turn over?
The front trailer is twice as likely to turn over as the tractor.
All trailers are equally likely to turn over.
The rear trailer is twice as likely to turn over as the tractor.
None of the above.
5. The trailer hand valve should:
never be used to test the trailer brakes.
be used in driving.
never be used for parking.
All of the above.
6. To test your parking brake, do the following:
Speed up to 15 mph, then set the parking brake.
Speed up to 5 mph, then set the parking brake.
Set the parking brake, and gently pull against it in a low gear.
Set the parking brake while going downhill.
7. If the air compressor is belt-driven, you should check the air compressor drive belt before each trip. The belt should be:
8. Strong winds can make it difficult to stay in your lane especially when driving:
flatbed trailers.
lighter vehicles.
heavier vehicles.
vehicles with ABS.
9. How can you tell if a converter dollie has ABS?
There is an ABS plaque on the right side of the dolly.
There is a red lamp on the left side of the dolly.
There is an ABS system on the right side of the dolly.
There is a yellow lamp on the left side of the dolly.
10. To reduce the chance of rollover, you should:
put the lightest parts of the cargo under the heaviest parts.
distributed the cargo as low as possible inside the trailer.
place the cargo as high as possible inside the trailer.
None of the above.
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NJ CDL Doubles Test

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