Instructions

Combination

All applicants who are applying for a Class A CDL should be prepared to take the Combination test. This test covers information found in Section 6 of the Nebraska Commercial Driver License Manual. Section 6 provides the information needed to safely operate tractor-trailers, doubles, triples, and straight trucks with trailers. The test is made up of 25 multiple-choice questions, and applicants will need to correctly answer a minimum of 20 questions to pass. The Combination test is not a replacement for the Double/Triple endorsement test.

Number of Question 25

Passing Score 20

19. To prevent a trailer from rolling over, you should:

Speed up when nearing a corner.

Make sudden steering moves.

Take on-ramps faster than the posted speed limit.

Drive slowly around corners.

To reduce the risk of a rollover when driving a combination vehicle, you should keep the weight of the cargo as low to the ground as possible and drive slowly around turns.

20. The trailer hand valve should be used:

Regularly to activate the trailer brakes in all driving conditions.

Only to test the trailer brakes.

Only in inclement weather when the trailer may skid.

Only if the trailer is carrying a load.

The trailer hand valve should be used only to test the trailer brakes. It should not be used while driving because it may cause the trailer to skid.

21. When driving a vehicle equipped with an Anti-Lock Braking System (ABS), brakes should be applied:

In the same way as they would be in a vehicle without ABS.

As the vehicle is placed in neutral.

With the hand brake.

When driving a vehicle with ABS, you should brake in the same manner as you would in a vehicle without ABS.

22. What is a tractor protection valve?

A valve to keep air in the brake system should there be a bad leak

A valve that prevents a truck from being stolen

A valve that prevents the driver from driving too fast

A tractor protection valve keeps air in a tractor or truck air brake system should the trailer break away or develop a bad leak. The valve will close automatically if the pressure drops to an unsafe level.

23. A trolley valve:

Should be used while driving.

Should only be used to test trailer brakes.

Should be used when parking uphill.

The trailer hand valve (also referred to as the trolley valve or Johnson bar) is a mechanism that works the trailer brakes. It should only be used to test the brakes. Using it while the vehicle is being driven could cause a skid. Never use the trailer hand valve while parking because doing so may release the air pressure from the braking system, releasing the brakes that are holding the vehicle in place.

24. Trailers built before 1975 are:

Required to have spring brakes.

Not required to have spring brakes.

Unsafe to drive.

Prohibited from public roadways.

Trailers built before 1975 are not required to have spring brakes. When parking a trailer without spring brakes, be sure to use wheel chocks to prevent the trailer from rolling.

25. When connecting a converter dolly to a second or third trailer, the trailer height should be:

Slightly higher than the center of the fifth wheel.

Level with the center of the fifth wheel.

Slightly lower than the center of the fifth wheel.

Next to the center of the fifth wheel.

When connecting a converter dolly to a second or third trailer, the trailer height should be correct. It should be slightly lower than the center of the fifth wheel.

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