CDL Combination Test Questions And Answers Rated A+.
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Course
CDL Combination
Institution
CDL Combination
CDL Combination Test Questions And Answers Rated A+.
If you cross connect the two air lines the following will result - correct answer. 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 b...
CDL Combination Test Questions And
Answers Rated A+.
If you cross connect the two air lines the following will result - correct answer. 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? - correct answer. Fully raised with the crank handle
secured in its bracket
Th trailer air supply control: - correct answer. Is a red, eight sided knob
A device which connects the service and emergency air lines from the truck to the trailer
is called.. - correct answer. Glad hands
If one of the glad hands on your blue air line is missing a seal: - correct answer. You
might end up with a service line air leak
In order to supply air to the trailer, you must first: - correct answer. Stop engine so you
can hear the brakes
The hand valve should be used: - correct answer. 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 - correct answer. 4
When should you use the hand valve to park a combination vehicle? - correct answer.
Never
When you get ready to back under the semi-trailer you should line up - correct answer.
Directly in front of the trailer
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 - correct answer. Nothing
is likely to happen until you try to apply the brakes
, When uncoupling, if you park the trailer at an angle... - correct answer. You could do
damage to the landing gear
Which of these statements is true? - correct answer. "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? - correct answer. It should not
be done
When you inspect the coupling, check to ensure that: - correct answer. There's a little
slack in the air lines
When backing under a tractor under a trailer you should expect: - correct answer.
Trailer will be lifted slightly when the tractor back under it
A king pin is: - correct answer. 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. - correct answer. Over the locking lever
The air leakage rate for a combination vehicle (engine off, brakes off) should be no
more than _____ psi per minute. - correct answer. 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? - correct answer. The emergency
and service air lines
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 answer. Red, blue
You should not back a tractor under a trailer until the whole air system is: - correct
answer. At normal pressure
Large combination vehicles take longer to stop: - correct answer. When they are
empty
In order to inspect the coupling, you should: - correct answer. Use a flashlight if
necessary
After you supply air to the trailer, make sure the air lines are not crossed and the trailer
brakes are working. This is done by: - correct answer. Applying and releasing the
trailer brakes and listening for brake sounds; and also by lifting the brake pedal
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