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CDL Class A Combination Vehicle Test Answered Questions
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CDL Class A Combination Vehicle Test Answered Questions
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CDL Class A Combination Vehicle TestAnswered Questions
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:
A) applying and releasing the trailer brakes and listening for brake sounds
B) lifting the brake pedals
C) turning on the parking brakes from the cab
D) releasing the tractor brakes - ANSWER-A
Air lines on a combination vehicle are often colored to keep them from getting mixed up.
The emergency line is ____; the service line is____.
A) Red, blue
B) Blue, red
C) Black, yellow
D) Depends on the type of trailer - ANSWER-A
If you cross connect the two air lines the following will result...
A) nothing, the lines are interchangeable
B) you will not have air going to the trailer brakes
C) your tractor brakes will lock up
D) you could not move the tractor - ANSWER-B
If you start a trailer skid you should...
A) step on the brakes quickly
B) release the brakes to get traction back
C) use the trailer hand brake
D) slowly apply pressure to the brakes - ANSWER-B
The air leakage rate for a combination vehicle (engine off, brakes off) should be no more
than ____ psi per minute.
A) 1
B) 2
C) 3
D) 4 - ANSWER-C
The earliest way to notice a trailer skid is...
A) by feeling the pull on your steering wheel
B) by feeling a jerking in the back of the tractor
C) by seeing it in your mirrors
D) by hearing the squeal from the tires - ANSWER-C
The hand valve should be used:
A) to test the trailer brakes
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