Free CDL Doubles and Triples Practice Test Questions

1. For the safest handling on the road when pulling doubles and triples how should the load be positioned?

1. The lighter load in first position, the heavier in the rear. 
2. The heavier load in first position, the lighter in the rear. 
3. It does not matter which trailer is heavier.

2. What is a converter dolly used for?

1. To couple tow or three trailers behind a tractor truck. 
2. To help move cargo in a semi-trailer. 
3. To couple a trailer to a tractor.

3. Do all converter dollies have spring brakes?

1. Yes 
2. No

4. What three methods can you use to secure a second trailer before coupling?

1. Release dolly brake by opening the air tank petcock or if the dolly has spring brake, use the dolly parking brake control. 
2. Wheel the dolly into position by hand so it is in line with the kingpin. 
3. Use the tractor and first semi trailer to pick up the converter dolly and move it into position. 
4. All of the above. 
5. None of the above.

5. The dolly tow bar may fly up if you unlock the pintle hook with the converter dolly still under the rear trailer.

1. True 
2. False

6. You should use different methods for uncoupling second and third trailers.

1. True 
2. False

7. Coupling and uncoupling methods are the same for more common tractor-trailer combinations, but there are other ways of coupling and uncoupling the many types of truck-trailer combinations that are in use.

1. True 
2. False

8. There are more things to inspect on a combination vehicle than on a single vehicle.

1. True 
2. False

9. Should you do a walk around inspection when preparing to pull Doubles or Triples?

1. Yes 
2. No

Answer Key

1. B 
2. A 
3. B 
4. D 
5. A 
6. B 
7. A 
8. A 
9. A