Is it important to be careful when driving doubles and triples?
A. Yes
B. No
A. Yes
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
A. True
Doubles and triples are not as likely to turn over as are other combination vehicles.
A. True
B. False
A. True
Is it alright not to check all the critical parts when doing a pretrip inspection on doubles or triples?
A. Yes
B. No
B. No
When driving doubles or triples how whould they be driven to avoid rollover or jackknifing?
C. Smoothly
Do doubles and triples need more space on the highway than other commercial vehicles?
A. Yes
B. No
A. Yes
For the safest handling on the road when pulling doubles and triples how should the load be positioned?
B. The heavier load in first position, the lighter in the rear.
What is a converter dolly used for?
C. To couple tow or three trailers behind a tractor truck.
Do all converter dollies have spring brakes?
A. Yes
B. No
B. No
What three methods can you use to secure a second trailer before coupling?
D. All of the above.
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
A. True
You should use different methods for uncoupling second and third trailers.
A. True
B. False
B. False
Coupling and uncoupling methods are the same for most 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
A. True
There are more things to inspect on a combination vehicle than on a single vehicle.
A. True
B. False
A. True
A safe speed on a curve for a straight truck or a single trailer combination vehicle is always the same as for a set of doubles or triples.
A. True
B. False
B. False
When pulling triple trailers, always put the heaviest trailer:
D. In the front
When coupling twin trailers, you should release the dolly brakes by:
D. Opening the air tank petcock
When connecting the converter dolly to the rear trailer, you should remember to:
D. All of the above
When coupling the rear trailer, the correct trailer height is:
B. When the locking jaws are closed around the kingpin
To uncouple double trailers, you should park your rig:
D. On level ground
To uncouple the converter dolly you should:
B. Lower the landing gear, disconnect safety chains, and chock the wheels
It is dangerous to unlock the pintle hook with the dolly still under the rear trailer because:
B. The dolly tow bar may fly up
When inspecting doubles, the shut off valves at the rear of the trailer should be:
B. Open at the rear of front trailer, closed at the rear of the last trailer
To check for air flow to the last trailer:
D. Open emergency shut off valve and listen for escaping air
You should test your tractor protection valve to avoid:
D. All of the above
To test the trailer service brakes you should:
D. Apply hand control and check to see if you feel the trailer brakes come on
When pulling triple trailers, which unit is more likely to roll over:
D. The last trailer
The stopping distance for a tractor trailer traveling 55 mph on dry pavement is:
D. Longer than a football field, about 300 feet
A drive-wheel skid when pulling doubles could result in a jackknife when:
A. The trailer pushes the towed vehicle sideways
When steering to avoid a crash while pulling doubles, remember to:
