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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Nebraska 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 Nebraska CDL Manual. Take this practice test now to prepare for the actual NE CDL combination test!
1. What factors can cause brakes to fail or fade?
Excessive use of the service brakes
Not relying on the engine braking effect
Brakes out of adjustment
All of the above.
2. When you turn suddenly while pulling doubles, which trailer is most likely to turn over?
The rear trailer is twice as likely to turn over as the tractor.
All trailers are equally likely to turn over.
The front trailer is twice as likely to turn over as the tractor.
None of the above.
3. When you park trailers without spring brakes, you should use wheel chocks:
to prevent air from escaping.
to keep the trailer from moving.
to prevent the transmission from shifting up.
to prevent overheating.
4. Do not use the trailer hand valve in driving because:
the trailer emergency brakes will come on.
the brakes can overheat and lose their braking power.
of the danger of making the trailer skid.
All of the above.
5. You are driving on a steep downgrade in the proper low gear. Your "safe" speed is 40 mph. When your speed reaches 40 mph, you should:
increase your speed to approximately 45 mph, and then apply release the brakes.
apply the brakes to quickly reduce your speed to 25 mph, and then release the brakes.
maintain your current speed, and apply the brakes when you reach 50 mph to gradually reduce your speed to 40 mph.
apply the brakes to gradually reduce your speed to 35 mph, and then release the brakes.
6. If you begin to feel drowsy while driving, you should:
open your window.
get an energy drink.
pull off the road and get some rest.
get some coffee.
7. When backing with a trailer, you should:
check your mirrors on both sides frequently.
look at your line of travel before you begin backing.
make pull-ups to re-position your vehicle as needed.
All of the above.
8. For a cargo fire in a box trailer, you should:
wait 10 minutes before opening the doors.
open the doors immediately and use the fire extinguisher.
keep the doors shut.
use the fire extinguisher on the doors.
9. Axle weight is:
the weight transmitted to the ground by one axle or one set of axles.
the maximum safe weight your tires can carry at a specified pressure.
the weight of all the axles added together.
the value specified by the manufacturer as the loaded weight of one axle.
10. Passive railroad crossings:
do not have traffic control devices.
usually have a person directing traffic.
should never be crossed using a CMV.
have at least one traffic control device.
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NE CDL Combination Test

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