Double and Triple Endorsement

1. Is it important to be careful when driving doubles and triples?

A. Yes
B. No

2. Special care should be taken when pulling two or three trailers because more things can go wrong and are less stable than other commercial vehicles.

A. True
B. False

3. Doubles and triples are not as likely to turn over as are other combination vehicles.

A. True
B. False

4. Is it alright to not check all the critical parts when doing a pretrip inspection on doubles or triples?

A. Yes
B. No

5. When driving doubles or triples how whould they be driven to avoid rollover or jackknifing?

A. Fast
B. Smoothly
C. Slowly

6. Doubles and triples take up more space and are longer than other commercial vehicles, but do they need more space to turn?

A. Yes
B. No

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

A. The lighter load in first position, the heavier in the rear.
B. The heavier load in first position, the lighter in the rear.
C. It does not matter which trailer is heavier.

8. What is a converter dolly used for?

A. To couple tow or three trailers behind a tractor truck.
B. To help move cargo in a semi-trailer.
C. To couple a trailer to a tractor.

9. Do all converter dollies have spring brakes?

A. Yes
B. No

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

A. Release dolly brake by opening the air tank petcock or if the dolly has spring brake, use the dolly parking brake control.
B. Wheel the dolly into position by hand so it is in line with the kingpin.
C. Use the tractor and first semi trailer to pick up the converter dolly and mobe it into position.
D. All of the above.
E. None of the above.

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

A. True
B. False

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

A. True
B. False

13. 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.

A. True
B. False

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

A. True
B. False

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

A. Yes
B. No

Answer Key
1. A
2. A
3. A
4. B
5. B
6. A
7. B
8. A
9. B
10. D
11. A
12. B
13. A
14. A
15. A