Florida CDL Combination Vehicles Exam
QUESTIONS AND ANSWERS 100%
RATED CORRECT WITH 100% SURE
PASS|GRADED A+
To back a trailer, what should you do? - CORRECT ANSWERS Do all of the above
Which of the following is most likely to roll over? - CORRECT ANSWERS The rear trailer of a
triple
To straighten out a jackknifing trailer, should you apply the trailer hand brake? - CORRECT ANSWERS
No, because the brakes on the trailer wheels caused the skid to begin with
What does the trailer air supply control do? - CORRECT ANSWERS 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? -
CORRECT ANSWERS All of the above
When you check the lower fifth wheel during the coupling process, you do NOT need to make sure -
CORRECT ANSWERS that the shut of valves are completely closed.
During a walk-around inspection of a combination vehicle, you should check to make sure that -
CORRECT ANSWERS all of the above are true.
What is the first step in coupling a tractor semi-trailer? - CORRECT ANSWERS Inspect the
fifth wheel.
Which of the following is NOT part of checking that air is flowing to all trailers? - CORRECT ANSWERS
Pressing the pedal several times to lower the air pressure
While uncoupling, what should you do AFTER you unlock the fifth wheel? - CORRECT ANSWERS
Pull the tractor forward so that if is partially clear of the trailer
What is the definition of "off-tracking?" - CORRECT ANSWERS How the rear wheels follow a
different path from the front wheels in a turn
Which of the following control the air service line? - CORRECT ANSWERS Both the trailer and
the foot brake
What is the best way to test the trailer service brakes? - CORRECT ANSWERS Pull forward
very slowly, then apply the trailer brakes with your hand control
Where would you find the shut-off valves? - CORRECT ANSWERS In the rear of the trailer
, If you try to couple when the trailer is too high, - CORRECT ANSWERS It may not couple
properly
To drive, how high do you need to raise the landing gear? - CORRECT ANSWERS All the way
up
If you use the trailer hand valve while driving, - CORRECT ANSWERS The trailer might skid
Which of the following is NOT part of inspecting the coupling? - CORRECT ANSWERS 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)? - CORRECT ANSWERS 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 - CORRECT ANSWERS
to keep the trailer from moving
After coupling, how much space should be between the upper and lower fifth wheel? - CORRECT
ANSWERS None
Which of the following is NOT a purpose of the emergency air line? - CORRECT ANSWERS 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? - CORRECT
ANSWERS It increases your normal braking ability
To prevent a rollover while you're driving a combination vehicle, you should - CORRECT ANSWERS
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? - CORRECT ANSWERS
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? - CORRECT ANSWERS 90 degrees
To unlock the fifth wheel, pull the release handle to the ___________ position. - CORRECT ANSWERS
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 ____. - CORRECT ANSWERS red; blue
You should not use the trailer hand brake to straighten out a jackknifing trailer, because - CORRECT
ANSWERS the brakes on the trailer wheels caused the skid in the first place.
What does the emergency air line do? - CORRECT ANSWERS It controls the emergency
brakes on combination vehicles
QUESTIONS AND ANSWERS 100%
RATED CORRECT WITH 100% SURE
PASS|GRADED A+
To back a trailer, what should you do? - CORRECT ANSWERS Do all of the above
Which of the following is most likely to roll over? - CORRECT ANSWERS The rear trailer of a
triple
To straighten out a jackknifing trailer, should you apply the trailer hand brake? - CORRECT ANSWERS
No, because the brakes on the trailer wheels caused the skid to begin with
What does the trailer air supply control do? - CORRECT ANSWERS 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? -
CORRECT ANSWERS All of the above
When you check the lower fifth wheel during the coupling process, you do NOT need to make sure -
CORRECT ANSWERS that the shut of valves are completely closed.
During a walk-around inspection of a combination vehicle, you should check to make sure that -
CORRECT ANSWERS all of the above are true.
What is the first step in coupling a tractor semi-trailer? - CORRECT ANSWERS Inspect the
fifth wheel.
Which of the following is NOT part of checking that air is flowing to all trailers? - CORRECT ANSWERS
Pressing the pedal several times to lower the air pressure
While uncoupling, what should you do AFTER you unlock the fifth wheel? - CORRECT ANSWERS
Pull the tractor forward so that if is partially clear of the trailer
What is the definition of "off-tracking?" - CORRECT ANSWERS How the rear wheels follow a
different path from the front wheels in a turn
Which of the following control the air service line? - CORRECT ANSWERS Both the trailer and
the foot brake
What is the best way to test the trailer service brakes? - CORRECT ANSWERS Pull forward
very slowly, then apply the trailer brakes with your hand control
Where would you find the shut-off valves? - CORRECT ANSWERS In the rear of the trailer
, If you try to couple when the trailer is too high, - CORRECT ANSWERS It may not couple
properly
To drive, how high do you need to raise the landing gear? - CORRECT ANSWERS All the way
up
If you use the trailer hand valve while driving, - CORRECT ANSWERS The trailer might skid
Which of the following is NOT part of inspecting the coupling? - CORRECT ANSWERS 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)? - CORRECT ANSWERS 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 - CORRECT ANSWERS
to keep the trailer from moving
After coupling, how much space should be between the upper and lower fifth wheel? - CORRECT
ANSWERS None
Which of the following is NOT a purpose of the emergency air line? - CORRECT ANSWERS 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? - CORRECT
ANSWERS It increases your normal braking ability
To prevent a rollover while you're driving a combination vehicle, you should - CORRECT ANSWERS
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? - CORRECT ANSWERS
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? - CORRECT ANSWERS 90 degrees
To unlock the fifth wheel, pull the release handle to the ___________ position. - CORRECT ANSWERS
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 ____. - CORRECT ANSWERS red; blue
You should not use the trailer hand brake to straighten out a jackknifing trailer, because - CORRECT
ANSWERS the brakes on the trailer wheels caused the skid in the first place.
What does the emergency air line do? - CORRECT ANSWERS It controls the emergency
brakes on combination vehicles
