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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 have convex mirrors, be aware that:
in a convex mirror objects appears larger than they really are.
objects seem closer than they really are.
objects may appear to be faster than they really are.
everything appears smaller in a convex mirror than it would if you were looking at it directly.
2. When you are driving on a slippery road, you should NOT:
take curves at slower speeds.
keep a longer following distance.
use the engine brake or speed retarder.
adjust turning and braking to road conditions.
3. Which of the following is NOT part of testing the trailer service brakes?
Pushing in the trailer air supply knob.
Moving the vehicle forward slowly.
Releasing the parking brakes.
Checking for normal air pressure.
4. The trailer hand valve should be used only:
in driving to prevent skids.
when the trailer is fully loaded.
to test the trailer brakes.
only in combination with the foot brake.
5. Before connecting the converter dolly to the rear trailer, make sure that:
the shut-off valves at the rear of the first trailer are open.
the trailer height is slightly lower than the center of the fifth-wheel.
the kingpin rests on the fifth-wheel.
the locking jaws rest on the kingpin.
6. If a load is placed on one side of the trailer:
your brakes won't work.
a rollover is more likely.
the steering axle weight will be too light to steer safely.
making turns may be easier.
7. The wheels of a large combination vehicle are more likely to lock up when:
the trailer has new tires.
the vehicle is lightly loaded.
you are traveling in very hot weather.
the vehicle is heavily loaded.
8. An Anti-lock Braking System (ABS):
keeps your wheels from locking up when you brake hard.
always shortens your stopping distance.
lets you drive faster.
increases your normal braking capability.
9. When the wheels of a trailer lock up, the trailer will tend to swing around. This is more likely to happen when:
the trailer is overloaded.
the trailer is empty or lightly loaded.
the trailer is fully loaded.
None of the above.
10. When backing a truck you should:
look straight ahead.
back and turn toward the right side.
always rely on your mirrors.
get out and walk around the vehicle before you begin to back.
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NJ CDL Combination Test

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