CDL Combination Test Study Questions and Answers Graded A 2024
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Course
CDL Combination
Institution
CDL Combination
If you cross connect the two air lines the following will result - You will not have air going to the trailer brakes
You have coupled with a semi-trailer. In what position should you put the front trailer supports before driving away? - Fully raised with the crank handle secured in its bracket
...
CDL Combination Test Study Questions
and Answers Graded A 2024
If you cross connect the two air lines the following will result - You will not have air going
to the trailer brakes
You have coupled with a semi-trailer. In what position should you put the front trailer
supports before driving away? - Fully raised with the crank handle secured in its bracket
Th trailer air supply control: - Is a red, eight sided knob
A device which connects the service and emergency air lines from the truck to the trailer
is called.. - Glad hands
If one of the glad hands on your blue air line is missing a seal: - You might end up with a
service line air leak
In order to supply air to the trailer, you must first: - Stop engine so you can hear the
brakes
The hand valve should be used: - To test the trailer brakes
The air leakage rate for a combination vehicle (engine off, brakes on) should not be
more than _______ psi per minute - 4
When should you use the hand valve to park a combination vehicle? - Never
When you get ready to back under the semi-trailer you should line up - Directly in front
of the trailer
CDL Combination Test
, CDL Combination Test
If the service air line comes apart while you are driving a combination vehicle but the
emergency line stays together, what will happen right away - Nothing is likely to happen
until you try to apply the brakes
When uncoupling, if you park the trailer at an angle... - You could do damage to the
landing gear
Which of these statements is true? - "Bobtail" tractors can take longer to stop than a
combination vehicle loaded to the maximum gross weight
In normal driving, some drivers use the hand valve before applying the brake pedal to
prevent a jackknife. Which of these statements is true? - It should not be done
When you inspect the coupling, check to ensure that: - There's a little slack in the air
lines
When backing under a tractor under a trailer you should expect: - Trailer will be lifted
slightly when the tractor back under it
A king pin is: - A pin which locks the trailer to the tractor on the fifth wheel
The safety catch for the fifth wheel locking level must be ______ for a coupling to be
complete. - Over the locking lever
The air leakage rate for a combination vehicle (engine off, brakes off) should be no
more than _____ psi per minute. - 3
You are coupling a tractor to a semi-trailer and have backed up but are not under it.
What should you hook up before backing under? - The emergency and service air lines
CDL Combination Test
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