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Drivers who want to drive combination vehicles must pass the combination vehicles test. The New Jersey CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the New Jersey CDL Manual. Take this practice test now to prepare for the actual NJ CDL combination test!
1. Which of the following is NOT a way to determine if your trailer is equipped with ABS (antilock braking system)?
It was built after March 1, 1998.
Wheel speed sensor wires are coming from the back of the brakes.
The letters "ABS" are printed on the side of the steering wheel.
It has yellow ABS malfunction lamps.
2. When backing with a trailer, you should:
look at your line of travel before you begin backing.
make pull-ups to re-position your vehicle as needed.
check your mirrors on both sides frequently.
All of the above.
3. You are inspecting your vehicle during a trip. What should you do?
Watch gauges for signs of trouble.
Use your senses to check for problems.
Check critical items such as tires, brakes, and lights.
All of the above.
4. When checking the lights before driving:
you should turn off the engine.
make sure the parking brake is not set.
you should check them from inside the vehicle.
the engine must be running.
5. If you begin to feel drowsy while driving, you should:
open your window.
get some coffee.
get an energy drink.
pull off the road and get some rest.
6. If your truck catches fire, the first thing you should do is to:
pull off the road and park in an open area.
get off the vehicle, open the hood and start shooting foamĀ to keep the engine cool.
get the vehicle off the road and park near other vehicles.
pull into a service station and call for help.
7. If your ABS is not working:
it will slow your truck to a halt and force you to pull over.
you should immediately bring your vehicle to a complete stop.
you still have normal brake functions, and should drive and brake as you always have.
the drive wheels will begin to spin, and you should take your foot off the accelerator.
8. You are driving a heavy vehicle with a manual transmission, and you have to stop on the shoulder while driving on an uphill grade. When putting your vehicle back in motion up the grade, you should:
use the parking brake to hold the vehicle until the clutch engages.
shift down to a speed that you can control without using the brakes.
keep the clutch slipping while slowly accelerating.
partly engage the clutch before you take your right foot off the brake.
9. If your trucks has a high center of gravity, which of the following is true for curves?
You should slow down, as your truck can roll over at the posted speed limit for the curve.
You should travel at the posted speed limit.
Reduce your speed to a crawl.
None of the above.
10. In vehicles with air brakes, the tractor protection valve:
carries air, which is controlled by the trailer hand brake or the foot brake.
is used to connect the service and emergency air lines from the truck/tractor to the trailer.
keeps air in the tractor or truck brake system.
provides the air pressure used to operate trailer brakes.
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NJ CDL Combination Test

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