Oregon CDL Class B Practice Test (OR) 3

5 out of 5 (84 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Embarking on your Oregon CDL Class B license journey is a crucial step towards a professional driving career. Recognizing this, our website offers the third in a series of comprehensive CDL practice tests, meticulously designed to simulate the real DMV experience. This specific Oregon CDL practice test is tailored for Class B CDL applicants, ensuring that you are well-prepared for what lies ahead. Our Oregon CDL Class B Practice Test comprises 20 carefully curated questions for the 2026 written test, reflecting a broad spectrum of topics essential for any aspiring commercial driver. To successfully pass, you need to correctly answer at least 16 questions. This high standard is set to ensure that you are thoroughly prepared for the DMV permit test. Topics covered include pre-trip vehicle inspection, basic vehicle control, and gear shifting - yes, we even delve into the intricacies of downshifting. Additionally, the CDL practice test encompasses critical areas like navigating hills and steep downgrades, effective communication with other road users, speed control, and vital drug and alcohol awareness. What sets our Oregon class B CDL practice test apart is the richness of its content. Drawn from a vast pool of DMV test questions, it covers a wide range of material, making it a comprehensive preparation tool. The questions are not only varied but are also written and rigorously reviewed by professional driving instructors. These experts bring decades of teaching experience and have assisted thousands in obtaining their driver's licenses. Their expertise ensures that sample CDL questions are both realistic and relevant to modern driving challenges. Moreover, we understand the importance of accessibility in today's fast-paced world. Hence, our Oregon DMV practice tests are readily accessible online through various platforms, including mobile and desktop devices. This flexibility allows you to practice anywhere, anytime, fitting seamlessly into your busy schedule!
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Sample Oregon CDL Test Questions - General Knowledge

Question 1

After the initial 50-mile cargo check, which time-or-distance interval is a required reinspection trigger?

  1. A 1 hour or 100 miles
  2. B 2 hours or 200 miles
  3. C 3 hours or 150 miles, whichever occurs first
  4. D 4 hours or 400 miles

Correct answer: C – 3 hours or 150 miles, whichever occurs first

Federal regulation requires cargo and its securement to be reexamined when the vehicle has been driven for three hours or 150 miles, whichever occurs first. A reinspection is also required after a change in duty status. The Oregon commercial driver manual presents the same three-hour-or-150-mile interval for cargo that can be inspected.

Source: Oregon Commercial Driver Manual — § 3.1, “Inspecting Cargo”, 49 CFR § 392.9(b)(2) — Inspection of Cargo, Cargo Securement Devices and Systems

Question 2

When should you downshift when approaching a curve?

  1. A After slowing, but before entering the curve
  2. B Only after reaching the middle of the curve
  3. C Immediately after leaving the curve
  4. D While braking hard within the curve

Correct answer: A – After slowing, but before entering the curve

Slow to a safe speed and select the proper lower gear before entering the curve. Being in the correct gear allows you to apply slight power through the curve, helping maintain vehicle stability and control. Braking or attempting a difficult gear change within the curve can increase the risk of a skid or rollover.

Source: Oregon Commercial Driver Manual — § 2.3.1, “Manual Transmissions”

Question 3

It is safe to remove a radiator cap while the pressurized cooling system is still hot.

  1. A True
  2. B False

Correct answer: B – False

Never remove a radiator cap or another part of a pressurized cooling system until the system has cooled. Steam and boiling coolant can spray out under pressure and cause severe burns. If coolant must be added, shut off the engine, wait for it to cool and protect your hands before slowly releasing the cap.

Source: Oregon Commercial Driver Manual — § 2.14.1, “Vehicle Checks”

Question 4

An ordinary 8-foot article on a flatbed is not blocked against forward movement. What is the minimum number of tiedowns required?

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

Correct answer: B – 2

Federal cargo-securement rules require at least two tiedowns for an unblocked article that is longer than 5 feet but no longer than 10 feet, regardless of its weight. Different minimums can apply when an article is shorter, blocked against forward movement or subject to special-purpose securement rules.

Source: 49 CFR § 393.110(b)(2)(ii) — Additional Requirements for Determining the Minimum Number of Tiedowns

Question 5

Which of these vehicle fires may require large quantities of water for cooling?

  1. A A tire fire
  2. B A gasoline fire
  3. C An electrical fire
  4. D A hazardous-chemical fire

Correct answer: A – A tire fire

A burning tire must be cooled, and a large amount of water may be needed. Do not use water on an electrical fire because of shock danger or on a gasoline fire because it can spread the flames. If hazardous materials are involved or you are unsure what to use, wait for trained firefighters.

Source: Oregon Commercial Driver Manual — § 2.21.3, “Fire Fighting”

Question 6

A commercial driver can be placed out of service immediately for 24 hours for which alcohol-related condition?

  1. A A BAC of 1.00% or higher
  2. B Any measured alcohol concentration or detected presence while on duty or operating a CMV
  3. C Only a BAC of 0.05% or higher
  4. D Only a BAC of 0.04% or higher

Correct answer: B – Any measured alcohol concentration or detected presence while on duty or operating a CMV

Federal regulation prohibits any measured alcohol concentration or detected presence of alcohol while a driver is on duty or operating or controlling a CMV. A violation results in an immediate 24-hour out-of-service order. The Oregon commercial driver manual separately explains that operating a CMV at 0.04% BAC or higher can result in CDL disqualification.

Source: Oregon Commercial Driver Manual — § 1.3.2, “Alcohol, Leaving the Scene of an Accident, and Commission of a Felony”, 49 CFR § 392.5(a)(2), (c) — Alcohol Prohibition

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