Nebraska CDL Combination Test (NE) 2026

4.9 out of 5 (37 votes)
80% Passing score
20 Questions
4 Mistakes allowed
As a Nebraska native, you know that driving here isn't just about getting from point A to point B. It's about understanding the nuances of operating large combination vehicles safely and efficiently on our roads. To help you ace your CDL combination vehicles endorsement, we've crafted a Nebraska CDL combination practice test that truly prepares you for real-world driving. Our Nebraska practice driving test is designed to provide a comprehensive understanding of key areas crucial to driving combination vehicles. You'll encounter questions on coupling and uncoupling, pre-trip inspections, air brake systems, and effective driving techniques. We believe in learning by doing, which is why some of our questions place you in real-life driving scenarios. This approach ensures you're not only studying for the test but also becoming a more competent and safer driver on the road. The combination CDL practice test consists of 20 multiple-choice questions, requiring at least 16 correct answers to pass. This focus on accuracy highlights the importance of understanding the increased stopping distances needed for combination vehicles due to their weight. Mastery of these topics is critical for maintaining safety on the road, ensuring you can handle the unique challenges of these larger, heavier vehicles. Unlike resources that promise shortcuts or so-called 'DMV test cheat sheets,' our Nebraska learners permit test prep is a reliable study tool with a proven history of effectiveness. We prioritize legality and reliability, offering a study aid that builds confidence and prepares you thoroughly for the Nebraska combination CDL test. If you find yourself stuck on a tough question, our test provides hints to guide you to the correct answer. Additionally, if you answer incorrectly, you'll receive detailed explanations, turning mistakes into valuable learning opportunities. Choose our Nebraska CDL combination practice test to ensure you're well-prepared, confident, and ready to hit the road safely. Gain the knowledge and skills necessary to excel in your CDL combination test and drive with the assurance that you're equipped for any situation Nebraska roads might throw at you.
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Sample Nebraska Combination Test Questions

Question 1

What is the main safety reason for keeping the fifth-wheel plate properly lubricated?

  1. A To prevent steering problems caused by excessive friction
  2. B To reduce tread wear on the trailer tires
  3. C To increase the tractor’s fuel economy
  4. D To raise the trailer during coupling

Correct answer: A – To prevent steering problems caused by excessive friction

The Nebraska manual directs drivers to confirm that the fifth-wheel plate is greased as required. During a turn, the tractor and trailer must rotate smoothly at the fifth wheel. Inadequate lubrication increases friction between them and can cause steering problems. Greasing is therefore an important part of inspecting the coupling system.

Source: Commercial Driver’s License Manual (Supplement to the Nebraska Driver’s Manual) — § 6.4.1, “Coupling Tractor-Semitrailers”

Question 2

Which procedure checks that air reaches every trailer in a combination?

  1. A Charge the system, pressurize each line, and open the emergency and service shutoff valves in turn at the rear of the last trailer
  2. B Apply only the trailer hand control and watch the tractor’s brake lights
  3. C Accelerate slowly and listen for the trailer brakes to release
  4. D Check the mirrors while repeatedly pressing the foot brake

Correct answer: A – Charge the system, pressurize each line, and open the emergency and service shutoff valves in turn at the rear of the last trailer

Secure the vehicle, build normal air pressure, and supply air to the trailers. Open the emergency-line valve at the rear of the last trailer and listen for escaping air, then close it. Pressurize the service line and repeat the check with its valve. Air from both lines confirms that the system is charged through every trailer.

Source: Commercial Driver’s License Manual (Supplement to the Nebraska Driver’s Manual) — § 6.5.2, “Combination Vehicle Brake Check”

Question 3

Which action supplies air to the trailer’s air tanks?

  1. A Connect the blue service line to the red supply line
  2. B Pull out the trailer air-supply control
  3. C Connect only the service-line glad hand
  4. D Push in the trailer air-supply control

Correct answer: D – Push in the trailer air-supply control

On newer vehicles, the trailer air-supply control is a red, eight-sided knob. Pushing it in opens the tractor-protection valve and supplies air through the emergency or supply line to charge the trailer tanks. Pulling it out shuts off the supply and applies the trailer’s emergency brakes.

Source: Commercial Driver’s License Manual (Supplement to the Nebraska Driver’s Manual) — § 6.2.3, “Trailer Air Supply Control”

Question 4

Which procedure should be used to test the trailer service brakes?

  1. A Build normal pressure, release the parking brakes, move forward slowly, and apply the trailer hand control if equipped
  2. B Accelerate rapidly and then release the trailer air supply
  3. C Make a sharp turn while applying the tractor parking brake
  4. D Remain parked and check the trailer only through the mirrors

Correct answer: A – Build normal pressure, release the parking brakes, move forward slowly, and apply the trailer hand control if equipped

Begin with normal air pressure and release the parking brakes. Move the combination forward slowly, then apply the trailer brakes with the hand control, if the vehicle has one. You should feel the trailer brakes engage. The hand control is used for this test, but the foot pedal controls the trailer service brakes during normal driving.

Source: Commercial Driver’s License Manual (Supplement to the Nebraska Driver’s Manual) — § 6.5.2, “Test Trailer Service Brakes”

Question 5

Which trailer setups are especially likely to hang up on a raised railroad crossing?

  1. A Trailers with unusually high ground clearance
  2. B Low-slung trailers and certain long trailers with landing gear set for a tandem-axle tractor
  3. C Trailers traveling above the posted speed limit
  4. D Any trailer carrying cargo near its legal weight limit

Correct answer: B – Low-slung trailers and certain long trailers with landing gear set for a tandem-axle tractor

The Nebraska manual identifies low-slung units, such as lowboys and car carriers, as particularly vulnerable at raised crossings. It also warns about a single-axle tractor pulling a long trailer whose landing gear is positioned for a tandem-axle tractor. Either configuration may lack enough clearance and become stuck on the tracks.

Source: Commercial Driver’s License Manual (Supplement to the Nebraska Driver’s Manual) — § 2.15.6, “Special Situations”

Question 6

How frequently should each trailer air tank be drained?

  1. A Once each week
  2. B Every day
  3. C Once each month
  4. D Only after a braking problem occurs

Correct answer: B – Every day

Each trailer and converter-dolly air tank should be drained every day. Water and compressor oil can accumulate in the tanks and interfere with proper brake operation. Automatic drains remove most moisture, but the manual still directs drivers to open those drains periodically to verify that they are functioning.

Source: Commercial Driver’s License Manual (Supplement to the Nebraska Driver’s Manual) — § 6.2.6, “Trailer Air Tanks”

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