FLORIDA CDL COMBINATION VEHICLES
(ALL EXAMS)
f To back a trailer, what should you do? - Do all of the above
Which of the following is most likely to roll over? - The rear trailer of a triple
To straighten out a jackknifing trailer, should you apply the trailer hand brake? - No, because the brakes
on the trailer wheels caused the skid to begin with
What does the trailer air supply control do? - By pushing it in, you supply the trailer with air.
Which of the following types of vehicles are more likely to get stuck at a raised railroad crossing? - All of
the above
When you check the lower fifth wheel during the coupling process, you do NOT need to make sure - that
the shut of valves are completely closed.
During a walk-around inspection of a combination vehicle, you should check to make sure that - all of the
above are true.
What is the first step in coupling a tractor semi-trailer? - Inspect the fifth wheel.
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
While uncoupling, what should you do AFTER you unlock the fifth wheel? - Pull the tractor forward so
that if is partially clear of the trailer
What is the definition of "off-tracking?" - How the rear wheels follow a different path from the front
wheels in a turn
Which of the following control the air service line? - Both the trailer and the foot brake
What is the best way to test the trailer service brakes? - Pull forward very slowly, then apply the trailer
brakes with your hand control
Where would you find the shut-off valves? - In the rear of the trailer
If you try to couple when the trailer is too high, - It may not couple properly
To drive, how high do you need to raise the landing gear? - All the way up
If you use the trailer hand valve while driving, - The trailer might skid
Which of the following is NOT part of inspecting the coupling? - Driving a few feet to test the coupling
, Which of the following is NOT a way to tell if your trailer is equipped with an antilock braking system
(ABS)? - Check if the letter "ABS" are painted on the left side of the trailer
When parking a vehicle that does not have spring brakes, you should use chocks - to keep the trailer
from moving
After coupling, how much space should be between the upper and lower fifth wheel? - None
Which of the following is NOT a purpose of the emergency air line? - To supply air to relay valves that
help the foot brake operate more quickly
Which of the following statements about an antilock braking system (ABS) is FALSE? - It increases your
normal braking ability
To prevent a rollover while you're driving a combination vehicle, you should - keep the cargo as low as
possible and drive slowly around turns
Which of the following is NOT part of testing the tractor protection valve? - Pulling forward slowly, then
applying the trailer brakes
When connecting the goad hands, you should press the two seals together with the couplers at what
angle to each other? - 90 degrees
To unlock the fifth wheel, pull the release handle to the ___________ position. - Open
Air lines on a combination vehicle are often colored to keep them from getting mixed up. The emergency
line is ____; the service line is ____. - red; blue
You should not use the trailer hand brake to straighten out a jackknifing trailer, because - the brakes on
the trailer wheels caused the skid in the first place.
What does the emergency air line do? - It controls the emergency brakes on combination vehicles
When backing a tractor under a trailer, you should - always use the lowest reverse gear
A trailer is most likely to jackknife when it is - empty
If the brakes did not release when you pushed the trailer air supply valve, you should - Check the air line
connections
You wish to turn right from a two-lane, two-way street into another. The truck is too long to turn without
swinging wide. You should turn as shown in figure - B
You should not use the trailer hand valve while driving because - of the danger of making the trailer skid
You should apply air to the trailer tanks by - pushing in the trailer air supply control
When you get ready to back under a trailer, you should line up - Directly in front of the trailer
When you turn suddenly while pulling doubles, which trailer is most likely to turn over? - The rear trailer
is twice as likely to turn over as the tractor
You should not back a tractor under a trailer until the whole air system is - at normal pressure
(ALL EXAMS)
f To back a trailer, what should you do? - Do all of the above
Which of the following is most likely to roll over? - The rear trailer of a triple
To straighten out a jackknifing trailer, should you apply the trailer hand brake? - No, because the brakes
on the trailer wheels caused the skid to begin with
What does the trailer air supply control do? - By pushing it in, you supply the trailer with air.
Which of the following types of vehicles are more likely to get stuck at a raised railroad crossing? - All of
the above
When you check the lower fifth wheel during the coupling process, you do NOT need to make sure - that
the shut of valves are completely closed.
During a walk-around inspection of a combination vehicle, you should check to make sure that - all of the
above are true.
What is the first step in coupling a tractor semi-trailer? - Inspect the fifth wheel.
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
While uncoupling, what should you do AFTER you unlock the fifth wheel? - Pull the tractor forward so
that if is partially clear of the trailer
What is the definition of "off-tracking?" - How the rear wheels follow a different path from the front
wheels in a turn
Which of the following control the air service line? - Both the trailer and the foot brake
What is the best way to test the trailer service brakes? - Pull forward very slowly, then apply the trailer
brakes with your hand control
Where would you find the shut-off valves? - In the rear of the trailer
If you try to couple when the trailer is too high, - It may not couple properly
To drive, how high do you need to raise the landing gear? - All the way up
If you use the trailer hand valve while driving, - The trailer might skid
Which of the following is NOT part of inspecting the coupling? - Driving a few feet to test the coupling
, Which of the following is NOT a way to tell if your trailer is equipped with an antilock braking system
(ABS)? - Check if the letter "ABS" are painted on the left side of the trailer
When parking a vehicle that does not have spring brakes, you should use chocks - to keep the trailer
from moving
After coupling, how much space should be between the upper and lower fifth wheel? - None
Which of the following is NOT a purpose of the emergency air line? - To supply air to relay valves that
help the foot brake operate more quickly
Which of the following statements about an antilock braking system (ABS) is FALSE? - It increases your
normal braking ability
To prevent a rollover while you're driving a combination vehicle, you should - keep the cargo as low as
possible and drive slowly around turns
Which of the following is NOT part of testing the tractor protection valve? - Pulling forward slowly, then
applying the trailer brakes
When connecting the goad hands, you should press the two seals together with the couplers at what
angle to each other? - 90 degrees
To unlock the fifth wheel, pull the release handle to the ___________ position. - Open
Air lines on a combination vehicle are often colored to keep them from getting mixed up. The emergency
line is ____; the service line is ____. - red; blue
You should not use the trailer hand brake to straighten out a jackknifing trailer, because - the brakes on
the trailer wheels caused the skid in the first place.
What does the emergency air line do? - It controls the emergency brakes on combination vehicles
When backing a tractor under a trailer, you should - always use the lowest reverse gear
A trailer is most likely to jackknife when it is - empty
If the brakes did not release when you pushed the trailer air supply valve, you should - Check the air line
connections
You wish to turn right from a two-lane, two-way street into another. The truck is too long to turn without
swinging wide. You should turn as shown in figure - B
You should not use the trailer hand valve while driving because - of the danger of making the trailer skid
You should apply air to the trailer tanks by - pushing in the trailer air supply control
When you get ready to back under a trailer, you should line up - Directly in front of the trailer
When you turn suddenly while pulling doubles, which trailer is most likely to turn over? - The rear trailer
is twice as likely to turn over as the tractor
You should not back a tractor under a trailer until the whole air system is - at normal pressure
