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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. Retarders:
help prevent accidents by applying extra braking power to the non-drive wheels.
help slow a vehicle and reduce brake wear.
apply their braking power whenever you push on the accelerator.
All of the above.
2. You should NOT use the parking brakes if:
the brakes are cold.
the brakes are very hot.
the brakes are too dry.
All of the above.
3. An ABS system:
helps increase a vehicle's stopping power.
decreases your stopping distance.
is a safety anti-skid braking system.
requires a change in the way you brake.
4. The best way to recognize that your trailer has started to skid is:
by opening the window and feeling the front of the mirror.
by recognizing tire failure.
by seeing it in your mirrors.
by feeling the brakes come on.
5. When trying to put out an electrical fire you should:
use an A extinguisher.
use a B or C extinguisher.
use an D extinguisher.
use water.
6. Which of the following is not proper tie-down equipment:
Bungee cords
7. You can release dolly brakes:
by closing the emergency line valve.
by opening the air tank petcock.
by opening the service line valve.
by closing the air tank petcock.
8. Which of the following is a common cause of truck fires?
Short circuits due to loose connections.
loose fuel connections.
Under-inflated tires and duals that touch.
All of the above.
9. Foundation brakes are used:
only with the front wheels.
only with the rear wheels.
at each wheel.
only with the right wheels.
10. Fully loaded rigs:
are less likely to roll over than empty rigs.
are just as likely to roll over as empty rigs.
are much more likely to roll over than empty rigs.
None of the above.
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Doubles Triples NJ CDL Test

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