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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. Texting while operating a commercial motor vehicle is:
acceptable if you are contacting your supervisor.
only allowed at night.
acceptable if you are contacting your dispacther.
2. Your vehicle has air brakes. To stop, you should:
push the brake pedal down.
release the accelerator, push in the clutch, and shift to Neutral at the same time.
pull the parking brake control knob out.
pump the brake pedal 3 times.
3. If the safety relief valve in the air brake system releases air:
this will supply more power to the brakes.
something is wrong.
the valve is fully operational.
this will supply more power to the drive wheels.
4. To prevent a rollover, the driver should:
make quick lane changes if possible.
pay extra attention to the coolant level.
drive on the shoulder if possible.
drive slowly around corners, on ramps, and off ramps.
5. When driving with more than one trailer, the _______ trailer should be the first one behind the tractor.
6. In a dual air brake system, if one air system is very low on pressure:
the effect won't be noticeable for the first 50 miles.
you should pump the brakes to restore pressure.
you should drive and brake as you always have.
either the front or rear brakes will not be operating fully.
7. Air tank drains:
are used to remove water and oil from the air tanks.
are used to move air to the brakes.
should not be used in wet weather.
protect the tanks and the rest of the system from too much pressure.
8. When you push in the red trailer air supply knob, this will:
open the emergency line shut-off valve at the rear of the last trailer.
disconnect the air lines from the trailer.
supply air to the emergency supply lines.
disconnect the electrical connector.
9. Most heavy trucks with manual transmissions require ____ to change gears.
double clutching
single clutching
triple clutching
None of the above.
10. Which of the following will off-track the most?
The rear wheels of the last trailer.
The rear wheels of the tractor.
The front wheels of the last trailer.
The front wheels of the tractor.
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NJ CDL Doubles Triples Test

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