CDL Combination Fl Exam Questions With Verified Answers.
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Course
CDL
Institution
CDL
CDL Combination Fl Exam Questions With
Verified Answers.
When backing a tractor under a trailer, you should expect that ? - answerthe 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 ? -
ans...
CDL Combination Fl Exam Questions With
Verified Answers.
When backing a tractor under a trailer, you should expect that ? - answer✔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 ? -
answer✔over the locking lever.
Which part of the kingpin should the locking jaw close around? - answer✔The shank.
When backing a tractor under a trailer, you should - answer✔always use the lowest gear.
Before you back under a trailer, make sure - answer✔the trailer brakes are locked.
After you lock the kingpin into the fifth wheel, you should check the connection by pulling -
answer✔the tractor ahead gently with the trailer brakes locked.
You cross the air lines when hooking up to an old trailer. What will happen? - answer✔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. - answer✔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. - answer✔red lights.
To stop a trailer skid, you should - answer✔release the brakes.
A tractor with a(n) _______ trailer requires the shortest amount of stopping distance. -
answer✔fully loaded.
Which of these statements are true? - answer✔"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? - answer✔empty.
If you do not do the final air brake check for air leaks and fix before driving, - answer✔you
could lose your brakes while driving.
Describe what the trailer air supply control does. - answer✔it is used to supply the trailer with
air, shut off, and apply the trailer emergency brakes.
Glad hands are used to connect the - answer✔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?
- answer✔a tractor pulling three trailers.
What is the emergency air line? - answer✔air lines that control the emergency brakes on
combination vehicles.
Air and electrical lines from the tractor to the trailer should be - answer✔secured but with
enough slack for turns
After the trailer has been coupled to the tractor, the tractor protection control valve should be
placed in what position? - answer✔normal
Under good driving conditions, you should leave at least one second of space between your
vehicle and the vehicle ahead for every _______ feet of you vehicle's length. - answer✔10
What is a tractor jackknifte? - answer✔when you lock up the drive tires on the tractor and the
tractor spins out sideways as the trailer continues to push forward.
You supply air to the trailer tanks by - answer✔pushing in the trailer air supply valve.
When coupling, the proper position of the fifth wheel is - answer✔tilted down towards the end of
the tractor.
While you are driving a combination vehicle, if the service line comes apart but the emergency
line stays together, what will happen right away? - answer✔nothing is likely to happen until you
try to apply the brakes.
When connection the glads hands, press the two seals together with the couplers at what angle to
each other? - answer✔90 degrees.
Which of the following is true about off-tracking or ''cheating" ? - answer✔If there is more than
one trailer, the rear wheel of the last trailer will off-track the most.
How should you test the tractor-semitrailer connection for security? - answer✔pull gently
forward in low gear against the locked trailer brakes: then look at it carefully.
You should not back a tractor under a trailer until the whole air system is ? - answer✔at normal
pressure
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