CDL Oklahoma Combination practice test Questions With Verified Answers.
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Course
CDL
Institution
CDL
CDL Oklahoma Combination practice test
Questions With Verified Answers.
What is a tractor jackknife? - answerWhen you lock up the drive tires on the tractor and the
tractor spins out sideways as the trailer continues to push forward
The iron trailer supports are up, and the trailer is resting o...
CDL Oklahoma Combination practice test
Questions With Verified Answers.
What is a tractor jackknife? - answer✔When you lock up the drive tires on the tractor and the
tractor spins out sideways as the trailer continues to push forward
The iron trailer supports are up, and the trailer is resting on the tractor. Make sure that -
answer✔there is enough clearance between the tractor frame and the landing gear.
You should use chocks when parking a trailer without spring brakes because
you don't want the trailer rolling down a hill. - answer✔if the air supply leaks away, there will be
no brakes
While you are driving, your emergency air line breaks or gets pulled apart. The loss of pressure
will cause the - answer✔trailer emergency brakes to come on.
When checking the trailer emergency brakes, make sure that the tractor protection control valve
is placed in the _______ position. - answer✔Emergency
Almost half of all truck driver deaths are the result of - answer✔Rollovers
You are coupling a tractor to a semi-trailer. You have backed up but are not yet under it. Before
backing under the semi-trailer, you should hook up
the emergency and service air lines.
the electrical service cable.
nothing. Back up and lock the fifth wheel. - answer✔the emergency and service air lines.
The trailer hand valve works the trailer brakes. Which of these statements is true?
The trailer hand valve should be used only to test the trailer brakes.
The foot brake sends air to all the brakes on the vehicle (including the trailer(s)).
Both of these statements are true. - answer✔Both of these statements are true.
What are the other names for the service air line? - answer✔Control line and signal line
If you have coupled with a semi-trailer, where should you put the front trailer supports before
driving away? - answer✔Fully raised with the crank handle secured in its bracket
he air leakage rate for a combination vehicle (engine off, brakes on) should not be more than ___
psi per minute. - answer✔4
Air and electrical lines from the tractor to the trailer should be - answer✔secured but with
enough slack for turns.
When backing a tractor under a trailer, you should - answer✔always use the lowest reverse gear.
Under good driving conditions, you should leave at least one second of space between your
vehicle and the vehicle ahead for every ___ feet of your vehicle's length. - answer✔10
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
The service line - answer✔carries air to a relay valve that allows the trailer brakes to be applied
quickly.
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.
After connecting the air lines but before backing under the trailer, you should - answer✔supply
air to the trailer system and then pull out the air supply knob.
Describe what the trailer air supply control does. - answer✔It is used to supply the trailer with
air, shut the air off, and apply the trailer emergency brakes.
The best way to tell if your trailer has started to skid is to - answer✔see it in your mirrors.
When you get ready to back under the semi-trailer, you should line up - answer✔directly in front
of the trailer.
In general, the higher your truck's center of gravity, the - answer✔easier it is to turn over.
The hand valve should be used
. - answer✔to test the trailer brakes.
What is the safest way for you to make a turn without entering another traffic lane? -
answer✔You should turn wide as you complete the turn.
Which of these statements is true? - answer✔"Bobtail" tractors can take longer to stop than a
combination vehicle loaded to the maximum gross weight.
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