Minnesota CDL Combination Test (MN) 2026

4.8 out of 5 (93 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Get ready for your Commercial Driver's License (CDL) combination vehicles endorsement with our MN DMV permit test practice. This comprehensive Minnesota DMV permit test practice features a wide array of multiple-choice questions covering all essential topics, including coupling and uncoupling, pre-trip inspections, driving techniques, backing and maneuvering, and air brake systems. Each combination CDL test comprises 20 questions, and you'll need at least 16 correct answers to pass. The MN DMV permit test practice is meticulously crafted to closely resemble the actual DMV permit test experience. While the DMV restricts the publication of real test questions and answers, our permit practice test includes questions that mirror the real thing. These questions cover identical topics and are designed with comparable phrasing, ensuring you grasp the essential concepts required to ace the real test. One key area you'll delve into is the increased stopping distances required for combination vehicles due to their greater weight. Understanding these differences is critical for maintaining safety on the road and ensuring you can handle the unique challenges posed by larger, heavier vehicles. Our Minnesota practice permit test emphasizes these and other vital topics, providing a robust preparation tool for aspiring CDL holders. Our MN permit test practice is regularly updated to reflect the most current driving laws and regulations, ensuring you study the most relevant and up-to-date information. Updated for 2026, our DMV practice test keeps you in sync with the latest changes in driving laws and regulations. As you work through the combination CDL practice test, you'll receive immediate feedback on each question. Detailed explanations accompany each answer, helping you understand why a particular answer is correct or incorrect. This feedback aids your learning process, ensuring you build a solid foundation of knowledge and are well-prepared for the real DPS permit test. Prepare confidently with our Minnesota combination vehicle test and ensure you're ready to tackle the challenges of the CDL combination vehicles endorsement. By mastering the essential topics and honing your skills through our MN CDL combination test, you'll be well on your way to becoming a safe and competent commercial driver.
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Sample Minnesota Combination Test Questions

Question 1

Why must a bobtail tractor be driven with extra caution?

  1. A Its steering system operates more slowly
  2. B It can be difficult to stop smoothly and may take longer to stop
  3. C It consumes substantially more fuel
  4. D Its trailer wheels can lock during braking

Correct answer: B – It can be difficult to stop smoothly and may take longer to stop

A bobtail is a tractor operating without a semitrailer. The Minnesota CDL manual states that bobtail tractors can be difficult to stop smoothly and may take longer to stop than a tractor-semitrailer loaded to its maximum gross weight. Drivers should leave plenty of following distance and begin braking early.

Source: Minnesota Commercial Driver’s License Manual — § 6.1.3, “Brake Early”

Question 2

What is the purpose of the service air line on a combination vehicle?

  1. A It supplies air directly to the trailer parking brakes
  2. B It carries air to operate equipment inside the cab
  3. C It carries a braking signal to relay valves that apply the trailer brakes
  4. D It fills the trailer air tanks during normal operation

Correct answer: C – It carries a braking signal to relay valves that apply the trailer brakes

The service line is also called the control or signal line. Its pressure changes according to the driver’s use of the foot brake or trailer hand valve. That pressure operates relay valves, allowing air stored in the trailer tanks to apply the trailer brakes more quickly.

Source: Minnesota Commercial Driver’s License Manual — § 6.2.4, “Trailer Air-lines”

Question 3

Which practices help reduce the risk of a combination-vehicle rollover?

  1. A Keep the cargo low and centered
  2. B Reduce speed before curves and ramps
  3. C Steer smoothly and avoid quick lane changes
  4. D All of the above

Correct answer: D – All of the above

Cargo placed high raises the vehicle’s center of gravity and increases rollover risk. Keep the load low and centered, and slow down before corners, ramps and off-ramps. Smooth steering is also important because sudden steering movements and quick lane changes can cause a trailer to overturn.

Source: Minnesota Commercial Driver’s License Manual — § 6.1.1, “Rollover Risks”, Minnesota Commercial Driver’s License Manual — § 6.1.2, “Steer Gently”

Question 4

During a sudden steering movement while pulling doubles, which unit is most likely to roll over?

  1. A The rear trailer
  2. B The front trailer
  3. C The tractor
  4. D All units are equally likely to roll over

Correct answer: A – The rear trailer

Rearward amplification creates the crack-the-whip effect in vehicles pulling multiple trailers. A sudden steering movement becomes more pronounced as it travels toward the rear of the combination, making the rear trailer the most likely unit to overturn. Drivers should steer gently and smoothly when pulling trailers.

Source: Minnesota Commercial Driver’s License Manual — § 6.1.2, “Steer Gently”

Question 5

Why should glad-hand seals be checked and cleaned before the air lines are connected?

  1. A To improve the tractor’s fuel economy
  2. B To reduce wear on the trailer tires
  3. C To help the fifth wheel lock more easily
  4. D To prevent air from escaping at the connection

Correct answer: D – To prevent air from escaping at the connection

Glad hands contain rubber seals that prevent air from escaping where the tractor and trailer air lines connect. The Minnesota CDL manual directs drivers to clean the couplers and seals before making the connection. Checking their condition helps ensure that the joined couplers form a sealed air connection.

Source: Minnesota Commercial Driver’s License Manual — § 6.2.5, “Hose Couplers (Glad Hands)”

Question 6

Why must the trailer’s electrical connection be secured and inspected during coupling?

  1. A To improve fuel economy
  2. B To reduce tire wear
  3. C To keep trailer lights and any equipped electric brakes operating
  4. D To help the fifth wheel close around the kingpin

Correct answer: C – To keep trailer lights and any equipped electric brakes operating

The electrical connector must be seated, free of damage and locked into place. A damaged or disconnected line can cause the trailer’s turn signals or brake lights to stop working. If the towed unit uses electric brakes, loss of the electrical connection can also result in loss of braking to that unit.

Source: Minnesota Commercial Driver’s License Manual — § 11.6.1, “Air and Electric Lines / Connectors”, Minnesota Commercial Driver’s License Manual — § 6.4.1, “Coupling Tractor-Semitrailers”

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