South Dakota CDL Class B Practice Test (SD) 3

4.8 out of 5 (47 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Are you gearing up to acquire your Class B CDL? Look no further! Our third South Dakota CDL practice test is precisely what you need to gear yourself up for the real DMV test in 2026. With 20 meticulously crafted CDL questions and answers, this DMV practice test is a crucial step towards your success. You need to nail at least 16 questions to pass, but don't fret if you don't ace it on your first try. The beauty of this CDL practice test is its allowance for unlimited attempts. You can retake it as many times as needed to ensure you're fully prepared and confident. Our South Dakota CDL Class B Practice Test is tailored for aspiring Class B CDL holders. It encompasses a wide array of topics, giving you a comprehensive overview of what to expect in 2026. From pre-trip vehicle inspection to mastering gear shifts, navigating steep downgrades to effective communication on the road, this SD DMV permit practice test has got you covered. It also delves into crucial aspects like speed control and the vital knowledge of drug and alcohol regulations. What sets our SD CDL practice test apart is its authentic feel. While we adhere to DMV guidelines and don't replicate actual CDL permit test questions, our practice questions are designed to emulate the real test experience. This method ensures you gain not just theoretical knowledge, but also a practical understanding of the test format and question styles. Ease of access is another hallmark of our South Dakota DMV practice tests. Whether you prefer studying on a desktop, a mobile device, or through mobile apps, our tests are easily accessible. This flexibility allows you to practice anytime, anywhere, fitting seamlessly into your busy schedule. So, if you're in South Dakota aiming for that Class B CDL, this CDL practice test is a crucial tool in your preparation arsenal for 2026! Dive in, practice thoroughly, and you'll be set to ace that DMV test!
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Sample South Dakota CDL Test Questions - General Knowledge

Question 1

Which brake conditions must be identified during a commercial-vehicle inspection?

  1. A Cracked brake drums
  2. B Oil, grease, or brake fluid on shoes or pads
  3. C Dangerously thin, missing, or broken shoes
  4. D All of the above

Correct answer: D – All of the above

The South Dakota CDL manual identifies cracked drums, contaminated shoes or pads, and dangerously thin, missing, or broken shoes as brake defects. Contamination can reduce friction, while damaged or excessively worn components may prevent effective braking. Every listed condition should be detected during the inspection.

Source: South Dakota Commercial Driver License Manual — § 2.1, “Vehicle Inspection,” “Bad Brake Drums or Shoes”

Question 2

Which group contains exterior lighting items that should be checked at the front of a commercial vehicle?

  1. A Fuel tank, air lines, and fifth wheel
  2. B Landing gear, trailer apron, and kingpin
  3. C Low- and high-beam headlights, front turn signals, and clearance lights
  4. D Rear doors, mudflaps, and trailer lamps

Correct answer: C – Low- and high-beam headlights, front turn signals, and clearance lights

The lighting inspection includes low- and high-beam headlights, turn signals, four-way flashers, and clearance lights. The driver must verify that the applicable exterior lights illuminate when activated and that their lenses are clean, correctly colored, and undamaged. The other listed groups involve side, rear, or coupling components.

Source: South Dakota Commercial Driver License Manual — § 11.4, “Lights Operations Check (All Vehicles)”, South Dakota Commercial Driver License Manual — § 11.5.1, “Front of Vehicle / Engine Area (Engine Off)”

Question 3

A South Dakota CDL holder is convicted of speeding while driving a personal vehicle. When must the driver notify the current employer?

  1. A Within 24 hours
  2. B Within two business days
  3. C Within 30 days
  4. D Only when the CDL is renewed

Correct answer: C – Within 30 days

Federal CDL rules require notification to the current employer within 30 days after a conviction for a state or local motor-vehicle traffic-control violation, except a parking violation. The requirement applies regardless of whether the driver was operating a commercial or personal vehicle. A suspension, revocation, cancellation, or disqualification has a different notification deadline.

Source: South Dakota Commercial Driver License Manual — § 1.4, “Other CDL Rules”, 49 CFR § 383.31(b) – Notification of convictions for driver violations

Question 4

What two methods can a driver use to determine when to shift to a higher gear?

  1. A Engine sound and coolant temperature
  2. B Engine speed and road speed
  3. C Elapsed time and clutch-pedal movement
  4. D Oil pressure and brake pressure

Correct answer: B – Engine speed and road speed

A driver can use engine speed or road speed to decide when to shift up. For engine speed, learn the vehicle’s proper operating rpm range and watch the tachometer. For road speed, learn the useful speed range for each gear and use the speedometer as a guide.

Source: South Dakota Commercial Driver License Manual — § 2.3.1, “Manual Transmissions,” “Knowing When to Shift Up”

Question 5

A driver may continue hauling liquid or gas in a tank vehicle after discovering that the tank is leaking, provided the cargo is not hazardous.

  1. A True
  2. B False

Correct answer: B – False

Do not transport liquids or gases in a leaking tank. Before loading, unloading, or driving, inspect beneath and around the vehicle and check the tank shell, valves, pipes, connections, and hoses. For hazardous-material cargo tanks, federal rules also require liquid-discharge valves and other closures to be closed and free of leaks during transportation.

Source: South Dakota Commercial Driver License Manual — § 8.1.1, “Leaks”, 49 CFR § 177.834(j) – General requirements

Question 6

The same loading and unloading procedure can be used for every class of hazardous material.

  1. A True
  2. B False

Correct answer: B – False

Federal hazardous-material rules include general precautions as well as procedures that apply to particular materials and hazard classes. Explosives, flammable gases and liquids, oxidizers, corrosives, and radioactive materials can require different handling, separation, equipment, or attendance measures. Drivers must follow the requirements applicable to the specific material being handled.

Source: South Dakota Commercial Driver License Manual — § 9.4, “Loading and Unloading”, 49 CFR § 177.834(c)–(f), (l) – General requirements

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