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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. If ABS is not working:
you will not have any brakes.
you should use the emergency brake.
you should use the parking brake.
you will still have brakes.
2. If you get stuck on railroad tracks, you should:
check the engine compartment quickly.
have a helper push your vehicle.
stay in the vehicle and call for help.
get out of the vehicle and away from the tracks.
3. If a vehicle is equipped with ABS, when you start the engine:
the spring brakes will come on.
the trailer emergency brakes will come on.
the ABS indicator light on the dash should come on and then turn off.
the wheels will lock up.
4. What type of vehicles can get stuck on a railroad-highway crossing?
Single-axle tractor pulling a long trailer with its landing gear set to accommodate a tandem-axle tractor
Moving vans
Car carriers
All of the above.
5. When you are uncoupling a loaded trailer, lower the landing gear until:
the pressure in the system is above 55 psi.
the tractor frame is under the trailer.
makes contact with the ground, and leave the trailer off the fifth wheel.
it makes firm contact with the ground.
6. Do not use the trailer hand valve in driving because:
the brakes can overheat and lose their braking power.
the trailer emergency brakes will come on.
of the danger of making the trailer skid.
All of the above.
7. Which of the following is NOT part of checking the sliding fifth-wheel?
Checking that the slide is not damaged or parts are missing
Checking that all locking pins are present and locked in place
Testing the tractor protection valve
Checking that it is properly greased
8. Emergency brakes are:
not required on doubles.
not required on buses.
not required on commercial vehicles with air brakes.
required on all vehicles.
9. Radial and bias-ply tires:
should not be used together.
should be used together only when driving in packed snow.
should be used together.
should be used together only during bad weather.
10. If there is a cargo fire in a van or box trailer, you should:
open the doors, especially if your cargo contains hazardous materials.
keep the doors shut.
keep driving until you reach help.
enlist the help of bystanders.
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CDL Combination Test (NJ)

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