CDL COMBINATION PRACTICE TEST (NC)

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Drivers who want to drive combination vehicles must pass the combination vehicles test. The North Carolina 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 North Carolina CDL Manual. Take this practice test now to prepare for the actual NC CDL combination test!
1. Strong winds can make it difficult to stay in your lane especially when driving:
lighter vehicles.
heavier vehicles.
flatbed trailers.
vehicles with ABS.
2. When driving in a construction zone, if a construction worker is near the road, you should:
come to a complete stop.
speed up.
maintain a constant speed.
further reduce your speed.
3. When the wheels of a trailer lock up:
the vehicle will gradually come to a complete stop.
the trailer will tend to swing around.
ABS will increase stopping power.
All of the above.
4. When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
The air could leak out of the trailer air tank, releasing its emergency brakes.
You may not notice a major leak in the service line until you try to put the brakes on.
None of the above.
5. What is countersteering?
Locking your wheels while turning in an emergency situation.
Staying off the brake while steering to the right to avoid an accident.
Turning the steering wheel quickly the other way after steering in an emergency situation.
Driving too fast for conditions.
6. The emergency air line:
causes the tractor protection valve to close when the emergency line loses pressure.
controls the emergency brakes on combination vehicles.
supplies air to the trailer air tanks.
All of the above.
7. Longer combination vehicles have the tendency to swing wide on turns. This is called:
rollover.
jackknifing.
hydroplaning.
off-tracking.
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:
partly engage the clutch before you take your right foot off the brake.
use the parking brake to hold the vehicle until the clutch engages.
keep the clutch slipping while slowly accelerating.
shift down to a speed that you can control without using the brakes.
9. If the safety relief valve in the air brake system releases air:
something is wrong.
the valve is fully operational.
this will supply more power to the brakes.
this will supply more power to the drive wheels.
10. As you approach off ramps and on ramps, remember:
that the posted speed limit may not be safe for larger vehicles.
to maintain your highway speed.
to always brake and turn at the same time.
that downgrades make it easier to reduce speed.
 
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NC CDL Combination Test

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