Combination
All applicants who are applying for a Class A CDL should be prepared to take the Combination test. This test covers information found in Section 6 of the Commercial Driver License Manual. Section 6 provides the information needed to safely operate tractor-trailers, doubles, triples, and straight trucks with trailers. The test is made up of 20 multiple-choice questions, and applicants will need to correctly answer a minimum of 16 questions to pass. The Combination test is not a replacement for the Double/Triple endorsement test.
1. Rollovers are most likely to happen when:
Rollovers happen when an operator turns too fast. Drivers should be sure to slow down before entering turns and curves, especially when transporting a fully-loaded rig.
2. All trailers made after ____ must be equipped with Anti-Lock Braking Systems (ABS).
All trailers and converter dollies manufactured on or after March 1, 1998 must have Anti-Lock Braking Systems (ABS).
3. Push in the trailer air supply control to:
Push in the trailer air supply control to supply the trailer with air. Pull out the trailer air supply control to turn off the air supply and activate the emergency brakes.
4. Pull out the trailer air supply control to test:
Be sure to test the trailer emergency brakes before beginning a trip. After ensuring that the trailer rolls freely, you can test the emergency brakes by pulling out the trailer air supply control, or placing it in the "emergency" position. Pull forward slightly with the tractor and make sure the trailer does not move.
5. What is another name for the service line?
The trailer service air line may also be referred to as the control line or signal line.
6. Which of the following types of vehicles is most prone to the “crack-the-whip" effect?
Double and triple combinations are the most vulnerable to turning over as a result of the "crack-the-whip" effect.
7. A trailer that is too high:
Before coupling together a tractor and a trailer, you should make sure the trailer is at the proper height. If the trailer is too low, the trailer nose may be damaged. If the trailer is too high, it may not be able to couple correctly.
See the exact questions that will be on the 2024 South Dakota DMV exam.
99.2% of people who use the cheat sheet pass the FIRST TIME
Alexa shares with us how she went in for her Class A permit and decided to get her Hazmat endorsement as a bonus!
Mark shares his feedback on his Class A CDL Cheat Sheet
