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?
Rear
Middle
Front
All are equally likely to turn over
Question 2
53% answer correctly
When hooking up a tractor to a trailer, the trailer is at the proper height when:
The coupling surface of the trailer 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 above the middle of the tractor fifth wheel
The kingpin is just below the middle of the tractor fifth wheel
Question 3
60% answer correctly
After pushing in the trailer supply valve you should not move the tractor until:
The warning buzzer has stopped
The entire air system is above 120 psi
The entire air system is above 60 psi and the warning buzzer has stopped
The entire air system is above 120 psi and the warning buzzer has stopped