CDL COMBINATION FL QUESTIONS
AND ANSWERS GRADED A+
m When backing a tractor under a trailer, you should expect that ? - the trailer will be lifted slightly when
the tractor back under it.
For coupling to be completed, the safety catch for the fifth wheel locking lever must me ? - over the
locking lever.
Which part of the kingpin should the locking jaw close around? - The shank.
When backing a tractor under a trailer, you should - always use the lowest gear.
Before you back under a trailer, make sure - the trailer brakes are locked.
After you lock the kingpin into the fifth wheel, you should check the connection by pulling - the tractor
ahead gently with the trailer brakes locked.
You cross the air lines when hooking up to an old trailer. What will happen? - if the trailer has no spring
breaks, you will be able to drive away but you won't have trailer brakes.
Semi- trailers made before 1975 that are equipped with air brakes. - often do not have spring brakes.
At night, when a vehicle is carrying a load that extends for feet or more beyond the rear of the body,
there must be ____________ at the extreme end of the load. - red lights.
To stop a trailer skid, you should - release the brakes.
A tractor with a(n) _______ trailer requires the shortest amount of stopping distance. - fully loaded.
Which of these statements are true? - "BobTail" tractors can take longer to stop than a combination
vehicle loaded to the maximum gross weight.
A trailer is most likely to jackknife when it is? - empty.
If you do not do the final air brake check for air leaks and fix before driving, - you could lose your brakes
while driving.
Describe what the trailer air supply control does. - it is used to supply the trailer with air, shut off, and
apply the trailer emergency brakes.
Glad hands are used to connect the - service and emergency air lines from the truck or tractor to the
trailer.
Which type of truck-trailer combination has the greatest chance of the "crack-the-whip" rollover? - a
tractor pulling three trailers.
What is the emergency air line? - air lines that control the emergency brakes on combination vehicles.
AND ANSWERS GRADED A+
m When backing a tractor under a trailer, you should expect that ? - the trailer will be lifted slightly when
the tractor back under it.
For coupling to be completed, the safety catch for the fifth wheel locking lever must me ? - over the
locking lever.
Which part of the kingpin should the locking jaw close around? - The shank.
When backing a tractor under a trailer, you should - always use the lowest gear.
Before you back under a trailer, make sure - the trailer brakes are locked.
After you lock the kingpin into the fifth wheel, you should check the connection by pulling - the tractor
ahead gently with the trailer brakes locked.
You cross the air lines when hooking up to an old trailer. What will happen? - if the trailer has no spring
breaks, you will be able to drive away but you won't have trailer brakes.
Semi- trailers made before 1975 that are equipped with air brakes. - often do not have spring brakes.
At night, when a vehicle is carrying a load that extends for feet or more beyond the rear of the body,
there must be ____________ at the extreme end of the load. - red lights.
To stop a trailer skid, you should - release the brakes.
A tractor with a(n) _______ trailer requires the shortest amount of stopping distance. - fully loaded.
Which of these statements are true? - "BobTail" tractors can take longer to stop than a combination
vehicle loaded to the maximum gross weight.
A trailer is most likely to jackknife when it is? - empty.
If you do not do the final air brake check for air leaks and fix before driving, - you could lose your brakes
while driving.
Describe what the trailer air supply control does. - it is used to supply the trailer with air, shut off, and
apply the trailer emergency brakes.
Glad hands are used to connect the - service and emergency air lines from the truck or tractor to the
trailer.
Which type of truck-trailer combination has the greatest chance of the "crack-the-whip" rollover? - a
tractor pulling three trailers.
What is the emergency air line? - air lines that control the emergency brakes on combination vehicles.
