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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 you will be transporting hazardous materials that require placards, you must:
obtain a special transit permit.
transport the materials at night only.
ask permission of the local transportation agency.
obtain a hazardous materials endorsement.
2. If you unlock the pintle hook with the dolly still under the rear trailer:
the dolly tow bar may fly up.
the brakes could be damaged by the combined forces of the springs and the air pressure.
your vehicle might roll away.
steam and boiling water can spray under pressure.
3. What are the two basic reasons for covering cargo?
To protect people from spilled cargo and the cargo from weather.
To protect people from spilled cargo and the cargo from pilferage.
To protect the cargo from weather and to avoid littering.
To protect the cargo from pilferage and from weather.
4. Most hydraulic brake failures occur for one of two reasons, one of which is:
loss of hydraulic pressure.
excessive downshifting.
relying too much on the engine braking effect.
driving in cold weather.
5. When connecting the glad hands, you should press the two seals together with the couplers at a ______ angle to each other.
180 degree
30 degree
90 degree
45 degree
6. When inspecting the cargo, make sure it is:
piled up.
secured properly for the first 50 miles after beginning a trip.
not overloaded.
All of the above.
7. Which of the following is not a reason for covering cargo?
To protect people from spilled cargo
To protect the cargo from weather
To prevent other drivers from looking at the cargo
All of the above.
8. When inspecting the coupling, check that the safety latch is:
in position over the locking lever.
pushing against the kingpin.
in the "lock" position.
None of the above.
9. When transporting cargo, cargo securement must be checked within the first _____ miles of a trip and every _____ miles after.
50; 250
50; 150
100; 150
150; 250
10. Hydroplaning:
never occurs at speeds below 40 mph.
only happens when tire pressure is higher than normal.
can occur at speeds as low as 30 mph.
only occurs at extremely high speeds.
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NJ CDL Combination Test

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