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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. Most truck driver deaths in crashes result from:
following too closely.
truck rollovers.
driving side-by-side with another truck.
2. Axle weight is:
the maximum safe weight your tires can carry at a specified pressure.
the value specified by the manufacturer as the loaded weight of one axle.
the weight of all the axles added together.
the weight transmitted to the ground by one axle or one set of axles.
3. Strong winds can make it difficult to stay in your lane, especially when:
driving at speeds below 40 mph.
driving alongside other vehicles.
going into tunnels.
coming out of tunnels.
4. You are coupling a tractor to a semi-trailer and have backed up but are not yet under the trailer. Before backing under the semi-trailer, you should hook up:
the landing gear.
the safety chain.
the emergency and service air lines.
the electrical service cable.
5. To prevent a rollover, you should keep the cargo as close to the ground as possible and:
keep an eye on your tires.
make sure that the release arm is in the engaged position.
go slowly around turns.
keep the vents clear so they work correctly.
6. If you are feeling sleepy, you should:
pull off the road and rest or take a nap.
slow down and drive on the shoulder of the road.
increase your speed to get to the destination quicker.
None of the above.
7. What is the emergency air line for?
It supplies air to the trailer air tanks, and controls the emergency brakes on combination vehicles.
It controls the front brakes of the tractor in case of an emergency.
It tells you the amount of brake pressure you need to stop the vehicle.
All of the above.
8. What should you do if your vehicle gets stuck on the railroad tracks?
Stay inside the vehicle and call 911.
Get out of the vehicle and away from the tracks as quickly as possible, then call 911.
Turn on the emergency flashers and call 911.
Call 911, then get out of the vehicle and away from the tracks.
9. When inspecting the coupling, make sure the fifth-wheel jaws have closed around the:
head of the kingpin.
the electrical cord.
the brake camshaft.
shank of the kingpin.
10. Tests have shown that trucks with a high center of gravity are more likely to tip over, therefore you should:
distribute the cargo so the majority of the weight is on the steering axle.
distribute the cargo as low as possible.
put the lightest parts of the cargo under the heaviest parts.
All of the above.
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NJ CDL Combination Test

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