Which of the following is not a purpose of the emergency air line?
to supply air to relay valves that helped the foot break operate more quickly
Which of the following could happen if you try to couple when the trailer is too high?
it might not couple correctly
What is the first step in coupling a tractor-semitrailer?
Inspect the fifth wheel
Which of the following is the definition of "offtracking?
How the rear wheels follow a different track than the front wheels in a turn
Which of the following is NOT part of inspecting the coupling?
Driving a few feet to test that it is connected correctly
What is the best way to test the trailer service brakes?
pull forward very slowly, then apply the trailer brakes with your hand control
When you check the lower fifth wheel, you do NOT need to check
that the shut-off valves are completely closed
Which of the following is NOT part of testing the tractor protection valve?
pulling forward slowly then applying the trailer brakes
While uncoupling, what should you do AFTER you unlock the fifth wheel?
pull the tractor forward so that it is partially clear of the trailer
To prevent a rollover while driving a combination vehicle, the two most important things are
keeping the cargo near the ground and driving slowly around turns
Which of the following controls air in the service line?
Both the hand brake and the foot brake
What does the trailer air supply control do?
By pushing it in, you supply the trailer with air
Which of the following is NOT part of checking that air is flowing to all trailers?
pressing the pedal several times to lower the air pressure
Where would you find the shut-off valves?
in the rear of a trailer
To straighten out a jackknifing trailer, should you apply your hand brake?
no, because the brakes on the trailer wheels are what caused the skid to begin with
If you use the trailer hand valve while driving,
you might make the trailer skid
When parking a vehicle that does not have spring brakes, you should use chocks
to keep the trailer from moving
Which of the following is NOT true about an antilock braking system (ABS)?
it increases your normal braking ability
Which of the following is NOT a way to tell if your trailer is equipped with an antilock braking system (ABS)?
the letters "ABS" are on the left side of the steering wheel
Which of the following is not a purpose of the emergency air line?
to supply air to relay valves that helped the foot break operate more quickly
Which of the following could happen if you try to couple when the trailer is too high?
it might not couple correctly
What is the first step in coupling a tractor-semitrailer?
Inspect the fifth wheel
Which of the following is the definition of "offtracking?
How the rear wheels follow a different track than the front wheels in a turn
Which of the following is NOT part of inspecting the coupling?
Driving a few feet to test that it is connected correctly
What is the best way to test the trailer service brakes?
pull forward very slowly, then apply the trailer brakes with your hand control
When you check the lower fifth wheel, you do NOT need to check
that the shut-off valves are completely closed
Which of the following is NOT part of testing the tractor protection valve?
pulling forward slowly then applying the trailer brakes
While uncoupling, what should you do AFTER you unlock the fifth wheel?
pull the tractor forward so that it is partially clear of the trailer
To prevent a rollover while driving a combination vehicle, the two most important things are
keeping the cargo near the ground and driving slowly around turns
Which of the following controls air in the service line?
Both the hand brake and the foot brake
What does the trailer air supply control do?
By pushing it in, you supply the trailer with air
Which of the following is NOT part of checking that air is flowing to all trailers?
pressing the pedal several times to lower the air pressure
Where would you find the shut-off valves?
in the rear of a trailer
To straighten out a jackknifing trailer, should you apply your hand brake?
no, because the brakes on the trailer wheels are what caused the skid to begin with
If you use the trailer hand valve while driving,
you might make the trailer skid
When parking a vehicle that does not have spring brakes, you should use chocks
to keep the trailer from moving
Which of the following is NOT true about an antilock braking system (ABS)?
it increases your normal braking ability
Which of the following is NOT a way to tell if your trailer is equipped with an antilock braking system (ABS)?
the letters "ABS" are on the left side of the steering wheel