CDL Combination Test/ 83 Quizzes & Ans/
Already Graded A+.
If you cross connect the two airlines the following will result - 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? - Answer: Fully raised with the crank handle
secured in its bracket
Th trailer air supply control: - 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. - Answer: Glad hands
Page 1 of 11
, If one of the glad hands on your blue airline is missing a seal: - Answer: You might
end up with a service line air leak
In order to supply air to the trailer, you must first: - Answer: Stop engine so you
can hear the brakes
The hand valve should be used: - 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 - Answer: 4
When should you use the hand valve to park a combination vehicle? - Answer:
Never
When you get ready to back under the semi-trailer you should line up - 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 - Answer: Nothing
is likely to happen until you try to apply the brakes
When uncoupling, if you park the trailer at an angle... - Answer: You could do
damage to the landing gear
Page 2 of 11
Already Graded A+.
If you cross connect the two airlines the following will result - 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? - Answer: Fully raised with the crank handle
secured in its bracket
Th trailer air supply control: - 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. - Answer: Glad hands
Page 1 of 11
, If one of the glad hands on your blue airline is missing a seal: - Answer: You might
end up with a service line air leak
In order to supply air to the trailer, you must first: - Answer: Stop engine so you
can hear the brakes
The hand valve should be used: - 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 - Answer: 4
When should you use the hand valve to park a combination vehicle? - Answer:
Never
When you get ready to back under the semi-trailer you should line up - 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 - Answer: Nothing
is likely to happen until you try to apply the brakes
When uncoupling, if you park the trailer at an angle... - Answer: You could do
damage to the landing gear
Page 2 of 11
