Nebraska CDL Combination Practice Test (NE) 2

5 out of 5 (36 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Welcome to the Nebraska CDL combination practice test, your premier resource for mastering the skills necessary to pass your Commercial Driver's License test. This Nebraska CDL combination practice test is designed to enhance your preparation with 20 multiple-choice questions that cover essential topics such as inspection procedures, safe driving practices, and air brake systems. With the ever-changing landscape of driving laws and regulations, our test is regularly updated for 2026, ensuring you are studying the most relevant information possible. Navigating the roads of Nebraska presents unique challenges, from the vast open plains of the Sandhills to the bustling interstates around Omaha and Lincoln. Understanding these varied driving conditions is crucial for any aspiring commercial driver. This DMV practice test will help you tackle such challenges by addressing critical topics, including the risks of jackknifing-a situation where the trailer swings out of alignment with the tractor. Smooth braking and careful handling techniques covered in this Nebraska learners permit test prep will equip you with the knowledge needed to avoid these potentially dangerous situations. For visual learners, our combination vehicle test includes questions accompanied by images, allowing for a more comprehensive understanding of the material. Visual aids can be especially beneficial in grasping complex concepts related to vehicle inspections and safe driving techniques, providing a clearer picture of what to expect on the road. All questions in this Nebraska learners permit practice test are crafted and reviewed by professional driving instructors with decades of experience. Their expertise ensures that the CDL combination test content is not only accurate but also practical, preparing you thoroughly for the real-world scenarios you'll face as a commercial driver. With their guidance, thousands of drivers have successfully obtained their licenses, and you can join their ranks by engaging with this expertly designed permit practice test. Aim to answer at least 16 questions correctly to pass, boosting your confidence and ensuring you are well-prepared for the Nebraska CDL combination test. Dive into the test today, and take the next step towards your commercial driving career with assurance and expertise.
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Sample Nebraska Combination Test Questions

Question 1

After coupling a tractor and semitrailer, how much visible space should remain between the upper and lower fifth wheel?

  1. A 1–2 inches
  2. B 2–5 inches
  3. C At least 5 inches
  4. D No space

Correct answer: D – No space

There should be no visible space between the upper and lower fifth wheel. A gap indicates an improper coupling, such as the kingpin sitting above the closed jaws. The driver must also verify that the jaws surround the kingpin shank, the locking lever is in the locked position, and the safety latch is engaged.

Source: Commercial Driver’s License Manual (Supplement to the Nebraska Driver’s Manual) — § 6.4.1, “Step 13. Inspect Coupling”

Question 2

Which procedure tests whether the tractor-protection valve operates correctly?

  1. A Open both air-line shutoff valves at the rear of the last trailer
  2. B Release the parking brake and gently pull the combination forward
  3. C Charge the trailer system, shut off the engine, and repeatedly apply and release the foot brake
  4. D Manually pull the trailer air-supply control before lowering air pressure

Correct answer: C – Charge the trailer system, shut off the engine, and repeatedly apply and release the foot brake

First charge the trailer air-brake system and push in the trailer air-supply control. Shut off the engine, then repeatedly apply and release the foot brake to lower tank pressure. The trailer air-supply control should pop out at the manufacturer’s specified pressure, usually within 20–45 psi, closing the tractor-protection valve.

Source: Commercial Driver’s License Manual (Supplement to the Nebraska Driver’s Manual) — § 6.5.2, “Test Tractor Protection Valve”

Question 3

What danger does rearward amplification create during a quick steering maneuver?

  1. A It reduces the tractor’s braking pressure
  2. B It makes the rear trailer more likely to swing sharply and roll over
  3. C It increases fuel consumption in the lead tractor
  4. D It causes accelerated wear on the steering tires

Correct answer: B – It makes the rear trailer more likely to swing sharply and roll over

Rearward amplification produces the combination vehicle’s “crack-the-whip” effect. A quick movement by the tractor becomes increasingly severe toward the rear of the combination. This makes the rear trailer more likely to swing outward or overturn than the tractor. Drivers should steer gently and avoid sudden lane changes.

Source: Commercial Driver’s License Manual (Supplement to the Nebraska Driver’s Manual) — § 6.1.2, “Steer Gently”

Question 4

Why must the trailer’s electrical connection be secure and undamaged?

  1. A To improve the tractor’s fuel economy
  2. B To reduce wear on the trailer tires
  3. C To maintain trailer lighting and any electric-brake operation
  4. D To hold the kingpin inside the fifth-wheel jaws

Correct answer: C – To maintain trailer lighting and any electric-brake operation

The electrical connector supplies power for trailer equipment such as turn signals and brake lights. A damaged or disconnected line can prevent the trailer from communicating the vehicle’s movements to other drivers. If the trailer uses electric brakes, losing the connection can also cause a total loss of braking on the towed unit. Air-brake connections must be inspected separately.

Source: Commercial Driver’s License Manual (Supplement to the Nebraska Driver’s Manual) — § 11.6.1, “Air and Electric Lines / Connectors”

Question 5

During an applied-brake leakage test, a combination vehicle should lose no more than how many psi in one minute?

  1. A 2 psi
  2. B 2½ psi
  3. C 3 psi
  4. D 4 psi

Correct answer: D – 4 psi

For Nebraska’s applied-brake leakage test, shut off the engine, release the parking brake and tractor-protection valve, and fully apply the foot brake. After the gauge stabilizes, hold the brake for one minute. A combination vehicle must not lose more than 4 psi during that minute. A greater loss indicates excessive leakage that must be corrected before driving.

Source: Commercial Driver’s License Manual (Supplement to the Nebraska Driver’s Manual) — § 5.3, “Test Air Leakage Rate”

Question 6

If locked trailer wheels cause the trailer to begin swinging toward a jackknife, what should you do?

  1. A Apply the trailer hand control more firmly
  2. B Accelerate to pull the trailer straight
  3. C Steer sharply away from the direction of the swing
  4. D Release the brakes to restore wheel traction

Correct answer: D – Release the brakes to restore wheel traction

Release the brakes when a trailer-wheel skid begins so the wheels can regain traction. Once the tires grip the road again, the trailer should begin following the tractor and straighten. Do not use the trailer hand control to correct the skid because additional trailer braking can keep the wheels locked and worsen the jackknife.

Source: Commercial Driver’s License Manual (Supplement to the Nebraska Driver’s Manual) — § 6.1.5, “Trailer Skids”

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