CDL Combination Vehicles Practice Test Results

Question 1
87% answer correctly
You`re pulling triples and turn suddenly. Which trailer is most likely to turn over?
Front
All are equally likely to turn over
Middle
Rear
Question 2
53% answer correctly
When hooking up a tractor to a trailer, the trailer is at the proper height when:
The kingpin is just below the middle of the tractor fifth wheel
The trailer dolly wheels are just barely off the ground when fully extended
The coupling surface of the trailer is just below the middle of the tractor fifth wheel
The coupling surface of the trailer is just above the middle of the tractor fifth wheel
Question 3
75% answer correctly
You`re hooking a tractor to a trailer. After connecting the air lines and before backing under the trailer you should:
Activate air supply to the trailerarray(s) then lock the trailer brakes
Be sure not to activate air supply to the trailerarray(s) to prevent damage to the air delivery system
Activate air supply to the trailerarray(s) and leave the trailer brakes unlocked
Pull forward to test the strength of the air line connection