CDL – Combination Vehicle Test (Q&A with Solutions)
– Complete Exam for Commercial Driver’s License.
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
– Complete Exam for Commercial Driver’s License.
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
