Florida CDL Combination Vehicles (All
exams) Exam Questions With Verified
Answers.
To back a trailer, what should you do? - answerDo all of the above
Which of the following is most likely to roll over? - answerThe rear trailer of a triple
To straighten out a jackknifing trailer, should you app...
To back a trailer, what should you do? - answer✔Do all of the above
Which of the following is most likely to roll over? - answer✔The rear trailer of a triple
To straighten out a jackknifing trailer, should you apply the trailer hand brake? - answer✔No,
because the brakes on the trailer wheels caused the skid to begin with
What does the trailer air supply control do? - answer✔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? - answer✔All of the above
When you check the lower fifth wheel during the coupling process, you do NOT need to make
sure - answer✔that the shut of valves are completely closed.
During a walk-around inspection of a combination vehicle, you should check to make sure that -
answer✔all of the above are true.
What is the first step in coupling a tractor semi-trailer? - answer✔Inspect the fifth wheel.
Which of the following is NOT part of checking that air is flowing to all trailers? -
answer✔Pressing the pedal several times to lower the air pressure
While uncoupling, what should you do AFTER you unlock the fifth wheel? - answer✔Pull the
tractor forward so that if is partially clear of the trailer
What is the definition of "off-tracking?" - answer✔How the rear wheels follow a different path
from the front wheels in a turn
Which of the following control the air service line? - answer✔Both the trailer and the foot brake
What is the best way to test the trailer service brakes? - answer✔Pull forward very slowly, then
apply the trailer brakes with your hand control
Where would you find the shut-off valves? - answer✔In the rear of the trailer
If you try to couple when the trailer is too high, - answer✔It may not couple properly
To drive, how high do you need to raise the landing gear? - answer✔All the way up
If you use the trailer hand valve while driving, - answer✔The trailer might skid
Which of the following is NOT part of inspecting the coupling? - answer✔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)? - answer✔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 - answer✔to
keep the trailer from moving
After coupling, how much space should be between the upper and lower fifth wheel? -
answer✔None
Which of the following is NOT a purpose of the emergency air line? - answer✔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? -
answer✔It increases your normal braking ability
To prevent a rollover while you're driving a combination vehicle, you should - answer✔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? - answer✔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? - answer✔90 degrees
To unlock the fifth wheel, pull the release handle to the ___________ position. - answer✔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 ____. - answer✔red; blue
You should not use the trailer hand brake to straighten out a jackknifing trailer, because -
answer✔the brakes on the trailer wheels caused the skid in the first place.
What does the emergency air line do? - answer✔It controls the emergency brakes on
combination vehicles
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