Ohio CDL Combination Practice Test (OH) 2

4.9 out of 5 (96 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Enhance your preparation for the Commercial Driver's License (CDL) with our Ohio BMV practice test, designed specifically to help you master the skills needed for driving combination vehicles. This Ohio CDL combination test includes 20 multiple-choice questions that cover essential topics such as inspection procedures, safe driving practices, air brake systems, and more. To pass, you must correctly answer at least 16 questions, but don't worry if you don't get it right the first time. You can take this Ohio permit practice test as many times as needed to ensure you're comfortable with the material before moving on to the next set of CDL practice tests. One of the key areas covered in this Ohio DMV practice test is the risk of jackknifing, where the trailer swings out of alignment with the tractor. This situation can be dangerous, especially on the winding roads of the Hocking Hills or the busy interstates around Columbus. Understanding how to avoid jackknifing through smooth braking and careful handling is crucial for safe driving. You'll also find questions related to Ohio's unique driving conditions, whether it's navigating the icy roads of Cleveland in winter or the rural routes in the southern part of the state. After completing the combination vehicle test, you'll have the opportunity to review your answers. This feature allows you to go over any questions you missed and read the explanations and hints provided. This review process is an invaluable tool for reinforcing your knowledge and building confidence. Our Ohio BMV practice test is designed to be a no-pressure environment, making it a stress-free way to learn. Unlike the actual written permit test, there's no rush or anxiety. You can take your time to understand each question fully, making this Ohio combination CDL test a perfect way to prepare for your permit test. Whether you're practicing on your own or with friends, this practice permit test offers a thorough and relaxed way to get ready for your CDL combination permit.
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Sample Ohio Combination Test Questions

Question 1

What condition is verified by testing the tractor protection valve?

  1. A That the engine is operating efficiently
  2. B That tire wear is evenly distributed
  3. C That the fifth wheel will couple more easily
  4. D That the valve closes automatically when air pressure becomes too low

Correct answer: D – That the valve closes automatically when air pressure becomes too low

The test verifies that the tractor protection valve closes when pressure falls into the range specified by the manufacturer, usually 20 to 45 psi. Closing the valve prevents additional air from leaving the tractor and releases air from the trailer emergency line. A defective valve could allow a trailer leak to drain the tractor's air system.

Source: Ohio Commercial Driver License Manual (HSY 7605) — § 6.2.2, “Tractor Protection Valve”; § 6.5.2, “Combination Vehicle Brake Check”

Question 2

A fully loaded truck, tractor, or semitrailer is about ten times more likely to roll over in a crash than an empty one. True or false?

  1. A True
  2. B False

Correct answer: A – True

Cargo raises a vehicle's center of gravity, making it easier to overturn. The manual states that a fully loaded truck, tractor, or semitrailer is ten times more likely to roll over in a crash than an empty one. Keeping cargo low and centered and reducing speed before turns help control rollover risk.

Source: Ohio Commercial Driver License Manual (HSY 7605) — § 6.1.1, “Rollover Risks”

Question 3

How should the tractor be positioned before it is backed under a semitrailer?

  1. A Slightly to the left of the trailer
  2. B With the kingpin aimed at one locking jaw
  3. C At approximately a 20-degree angle
  4. D Directly in front of and aligned with the trailer

Correct answer: D – Directly in front of and aligned with the trailer

Position the tractor directly in front of the trailer and check alignment in both outside mirrors. Backing under at an angle can push the trailer sideways and damage or break the landing gear. The tractor should remain straight as it is backed slowly toward the kingpin.

Source: Ohio Commercial Driver License Manual (HSY 7605) — § 6.4.1, “Coupling Tractor-Semitrailers”

Question 4

After connecting the air lines, what must happen before the tractor is backed under the trailer?

  1. A Pressure must remain between 60 and 80 psi
  2. B The system must be reduced to half pressure
  3. C Air pressure must build to its normal level
  4. D All air must be released from the system

Correct answer: C – Air pressure must build to its normal level

After connecting the emergency and service lines, supply air to the trailer and wait for pressure to reach its normal level. Check for crossed lines and verify that the trailer brakes apply and release. The trailer brakes are then locked before the tractor is backed fully under the trailer.

Source: Ohio Commercial Driver License Manual (HSY 7605) — § 6.4.1, “Coupling Tractor-Semitrailers”

Question 5

Immediately before backing the tractor under a semitrailer, which condition must be verified?

  1. A The tractor protection valve is in its normal position
  2. B All parking and emergency brakes are released
  3. C The trailer landing gear is fully raised
  4. D The trailer brakes are locked

Correct answer: D – The trailer brakes are locked

The Ohio coupling sequence requires normal air pressure before the trailer brakes are locked. Pull out the trailer air-supply control, or move the tractor protection control to the emergency position, to lock them. The landing gear remains down until the tractor and trailer are securely coupled and the connection has been checked.

Source: Ohio Commercial Driver License Manual (HSY 7605) — § 6.4.1, “Coupling Tractor-Semitrailers”

Question 6

Which condition can cause a trailer to become stuck on a raised railroad-highway crossing?

  1. A Excessive underbody clearance
  2. B Low underbody clearance or landing gear positioned for a taller tractor configuration
  3. C Approaching the crossing below the speed limit
  4. D Carrying a properly centered load

Correct answer: B – Low underbody clearance or landing gear positioned for a taller tractor configuration

Low-slung trailers can contact the surface of a raised crossing and become hung up. A long trailer pulled by a single-axle tractor is also at risk when its landing gear is set to accommodate a tandem-axle tractor. Drivers should assess the trailer's clearance before attempting to cross the tracks.

Source: Ohio Commercial Driver License Manual (HSY 7605) — § 6.1.4, “Railroad-highway Crossings”

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