Delaware CDL Combination Test (DE) 2026

4.9 out of 5 (67 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Prepare for your Commercial Driver's License (CDL) combination vehicles endorsement with our Delaware CDL combination practice test. Our comprehensive test features a variety of multiple-choice questions that cover all the essential topics you need to know, including coupling and uncoupling, pre-trip inspections, driving techniques, backing and maneuvering, and air brake systems. This Delaware DMV practice test is meticulously designed to help you master the skills and knowledge necessary for handling combination vehicles safely and effectively. Each combination vehicle test consists of 20 questions, and you'll need at least 16 correct answers to pass. These questions delve into critical areas such as the increased stopping distances required for combination vehicles due to their greater weight. Understanding these nuances is vital for maintaining safety on the road, ensuring you can handle the unique challenges presented by these larger, heavier vehicles. To aid in your preparation, our Delaware driving test practice includes visual learning aids. Many of the sample permit test questions come with images to help you better understand the material. This feature is especially beneficial for visual learners, as it provides a clearer, more intuitive grasp of the concepts being tested. Additionally, our Delaware practice permit test is equipped with numerous study aids designed to accelerate your learning process. If you encounter a difficult question, you can request a hint to guide you toward the correct answer. Furthermore, if you answer a question incorrectly, the drivers license test practice will provide a detailed explanation of the correct answer, helping you learn from your mistakes and reinforce your understanding. Best of all, our combination CDL test is completely free. Unlike many expensive paid practice tests, our Delaware CDL combination practice test offers the same robust features and study opportunities without any cost. This ensures that you have access to high-quality preparation materials, helping you succeed in your pursuit of a CDL endorsement without any financial burden. Take advantage of our Delaware CDL combination test today and equip yourself with the knowledge and confidence needed to excel on your DMV test practice. With thorough preparation, you'll be well on your way to obtaining your CDL combination vehicles endorsement and advancing your career in commercial driving.
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Sample Delaware Combination Test Questions

Question 1

What can happen if a trailer is set too low as the tractor backs underneath it?

  1. A The trailer air tanks may overcharge
  2. B The electrical cord cannot be connected
  3. C The tractor may strike and damage the trailer nose
  4. D The fifth-wheel jaws will automatically readjust the height

Correct answer: C – The tractor may strike and damage the trailer nose

Before coupling, adjust the trailer so the tractor raises it slightly while backing underneath. If the trailer is too low, the tractor can strike and damage the trailer nose. If it is too high, the kingpin may not enter and lock into the fifth wheel correctly.

Source: Delaware Commercial Driver’s Manual — § 6.4.1, “Coupling Tractor-Semitrailers,” Step 6, “Check Trailer Height”

Question 2

After a tractor and semitrailer are coupled, how much space should remain between the upper and lower fifth-wheel surfaces?

  1. A About 1 inch
  2. B Between 2 and 5 inches
  3. C At least 5 inches
  4. D No space

Correct answer: D – No space

There should be no space between the upper and lower fifth wheel after coupling. A gap can indicate that the kingpin is sitting on top of the closed jaws instead of being secured inside them. The driver must also look into the fifth wheel and verify that the jaws have closed around the kingpin shank.

Source: Delaware Commercial Driver’s Manual — § 6.4.1, “Coupling Tractor-Semitrailers,” Step 13, “Inspect Coupling”

Question 3

A fully loaded combination vehicle is about ten times more likely to roll over in a crash than an empty rig.

  1. A TRUE
  2. B FALSE

Correct answer: A – TRUE

The statement is true. The Delaware CDL manual teaches that fully loaded rigs are ten times more likely to roll over in a crash than empty rigs. Cargo piled higher raises the center of gravity and makes the vehicle easier to overturn, particularly during turns or sudden steering movements.

Source: Delaware Commercial Driver’s Manual — § 6.1.1, “Rollover Risks”

Question 4

Why should cargo in a combination vehicle be loaded as close to the ground as practical?

  1. A It keeps the center of gravity lower and reduces rollover risk
  2. B It allows the cargo to be unloaded without equipment
  3. C It eliminates the need for cargo securement
  4. D It prevents all off-tracking during turns

Correct answer: A – It keeps the center of gravity lower and reduces rollover risk

Keeping cargo low helps prevent rollover because it keeps the vehicle’s center of gravity closer to the road. A high or top-heavy load makes a vehicle more likely to tip during curves, turns, or sudden maneuvers. The load should also be centered and distributed as evenly as possible.

Source: Delaware Commercial Driver’s Manual — § 6.1.1, “Rollover Risks”

Question 5

Which electrical-cord check should be completed after coupling a tractor and semitrailer?

  1. A Leave the plug loose so it can move freely
  2. B Route the cord against rotating vehicle parts
  3. C Plug it in, secure the safety catch, and inspect the line for damage
  4. D Wait until after driving to check the connection

Correct answer: C – Plug it in, secure the safety catch, and inspect the line for damage

After coupling, plug the electrical cord into the trailer and fasten its safety catch. Inspect the electrical line and both air lines for damage. They must also be routed and supported so they cannot contact moving vehicle parts or be crushed during operation.

Source: Delaware Commercial Driver’s Manual — § 6.4.1, “Coupling Tractor-Semitrailers,” Step 14, “Connect the Electrical Cord and Check Air-lines”

Question 6

Which statement correctly describes off-tracking?

  1. A The driver intentionally moves onto the shoulder during a turn
  2. B The trailer moves in the opposite direction from the tractor
  3. C The rear wheels follow a different path from the front wheels in a turn
  4. D The vehicle loses traction on an unpaved road

Correct answer: C – The rear wheels follow a different path from the front wheels in a turn

The Delaware CDL manual calls it off-tracking when the rear wheels follow a different path from the front wheels around a corner. Longer vehicles off-track more, and the rear wheels of a trailer off-track more than those of the powered unit. In a multiple-trailer combination, the last trailer’s rear wheels off-track the most.

Source: Delaware Commercial Driver’s Manual — § 6.1.6, “Turn Wide”

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