Oregon CDL Combination Practice Test (OR) 2

5 out of 5 (53 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Are you preparing for your Commercial Driver's License in Oregon? Our CDL combination practice test is designed to help you pass the permit test with flying colors. This Oregon DMV permit practice test features 20 multiple-choice questions covering essential topics such as inspection procedures, safe driving practices, and air brake systems. To pass, you'll need to answer at least 16 questions correctly. But don't worry-our test is free and can be taken as many times as you need. This means you can get comfortable with this set of questions before moving on to the next practice permit test. The CDL combination practice test is structured similarly to the actual written permit test, with a multiple-choice and true-or-false format. This allows you to practice eliminating incorrect answers to find the right one, which is a crucial skill for the real test. Our test is designed to boost your confidence and ensure you're well-prepared for the permit test. Key areas include the risks of jackknifing, where the trailer swings out of alignment with the tractor. Learning to avoid this dangerous situation through smooth braking and careful handling is vital for safe driving. Oregon is known for its diverse driving conditions, from the bustling streets of Portland to the winding roads of the Cascades and the open highways of Eastern Oregon. Each region presents unique challenges for commercial drivers. For instance, the wet and rainy weather in Western Oregon can make roads slippery, requiring extra caution and expertise in handling combination vehicles. Our Oregon CDL combination test will help you navigate these challenges confidently. We believe in providing high-quality, free resources that are as comprehensive as any paid counterpart. With our Oregon DMV practice test, you're not just memorizing facts but also learning the skills necessary for a successful and safe driving career. Take advantage of our free Oregon driver's permit practice test today and get on the road to success.
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Sample Oregon Combination Test Questions

Question 1

As part of the coupling inspection, should you look into the back of the fifth wheel to verify that it is locked onto the kingpin?

  1. A True
  2. B False

Correct answer: A – True

After securing the vehicle, look into the rear of the fifth wheel, using a flashlight if necessary. Confirm that the jaws are closed around the kingpin’s shank and that there is no space between the upper and lower fifth wheel. Also verify that the locking lever and safety latch are properly secured.

Source: Oregon Commercial Driver Manual — § 6.4.1, “Coupling Tractor-Semitrailers”

Question 2

If the service air line separates but the emergency line remains connected, what may you notice before applying the brakes?

  1. A The tractor emergency brakes apply immediately
  2. B The combination immediately comes to a complete stop
  3. C The trailer air tank instantly empties while the brakes are released
  4. D Nothing unusual may be apparent until you try to brake

Correct answer: D – Nothing unusual may be apparent until you try to brake

A major service-line leak may not be noticeable until the driver applies the brakes. Applying the brakes sends pressure through that line, allowing air to escape rapidly through the leak. If trailer tank pressure falls far enough, the trailer emergency brakes will eventually apply.

Source: Oregon Commercial Driver Manual — § 6.2.4, “Trailer Air-lines”

Question 3

Before driving, it is sufficient to raise the trailer landing gear only slightly above the pavement. True or false?

  1. A True
  2. B False

Correct answer: B – False

The landing gear must be raised completely before driving. If it remains only partly raised, it may catch on railroad tracks, pavement changes, or other obstacles. Once it is fully raised, secure the crank handle and verify adequate clearance between the landing gear and tractor frame.

Source: Oregon Commercial Driver Manual — § 6.4.1, “Coupling Tractor-Semitrailers”

Question 4

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

  1. A It lowers the center of gravity and reduces rollover risk
  2. B It makes every type of cargo easier to unload
  3. C It automatically improves fuel economy
  4. D It eliminates tire wear

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

Oregon’s CDL manual identifies keeping cargo low as an important way to prevent rollovers. Stacking cargo higher raises the combination’s center of gravity and makes it easier to overturn. The load should also be centered and distributed as evenly as possible because a trailer leaning to one side has a greater rollover risk.

Source: Oregon Commercial Driver Manual — § 6.1.1, “Rollover Risks”

Question 5

Which condition must you verify when inspecting the trailer’s air-line and glad-hand connections?

  1. A Minor damage is acceptable if the trailer moves
  2. B Connections are secure and leak-free, and the lines are undamaged
  3. C Damaged couplers have been wrapped with tape
  4. D Only the emergency-line connection has been checked

Correct answer: B – Connections are secure and leak-free, and the lines are undamaged

During a combination-vehicle inspection, the air lines must be properly connected to the glad hands, secured with enough slack for turns, and free from leaks. Oregon’s CDL manual also requires checking that all lines are free from damage. A damaged or leaking connection does not satisfy these inspection conditions.

Source: Oregon Commercial Driver Manual — § 6.5.1, “Additional Things to Check during a Walk-around Inspection”

Question 6

Which action can damage a semitrailer’s landing gear during uncoupling?

  1. A Keeping the tractor aligned with the trailer
  2. B Lowering the landing gear onto a supporting surface
  3. C Pulling the tractor out from under the trailer at an angle
  4. D Easing pressure from the fifth-wheel jaws

Correct answer: C – Pulling the tractor out from under the trailer at an angle

Before uncoupling, position the tractor in line with the trailer. Pulling out at an angle places sideways force on the trailer supports and can damage the landing gear. Proper alignment also allows the tractor to move straight forward from beneath the trailer.

Source: Oregon Commercial Driver Manual — § 6.4.2, “Uncoupling Tractor-Semitrailers”

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