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CDL Combination Vehicle Practice Test Questions and Answers
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CDL Combination Vehicle Practice Test Questions and Answers
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CDL Combination Vehicle Practice TestQuestions and Answers
A tractor with a(n) ________ trailer requires the shortest amount of stopping distance .
1. empty
2. fully loaded
3. lightly loaded - ANSWER-fully loaded
A trailer is most likely to jackknife when it is ...
1. loaded to full capacity
2. overloaded
3. empty - ANSWER-empty
After you have coupled the trailer, you should start to raise the landing gear by using
1. low gear
2. high gear
3. intermediate gear - ANSWER-low gear
After you lock the kingpin into the fifth wheel, you should check the connection by pulling
1. the tractor ahead gently with the trailer brakes locked
2. forward 50 feet, then turning right, and then left
3. the tractor ahead sharply to release the trailer brakes - ANSWER-the tractor ahead
gently with the trailer brakes locked
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 ..
1. lifting the brake pedal
2. applying and releasing the trailer brakes and listening for brake sounds
3. turning on the parking brake from the cab - ANSWER-applying and releasing the trailer
brakes and listening for brake sounds
Air and electrical lines from the tractor to the trailer should be...
1. pulled tight with very little slack
2. secured but with enough slack for turns
3. resting on the frame of the tractor. - ANSWER-secured but with enough slack for turns
At night, when a vehicle is carrying a load that extends four feet or more beyond the rear of
the body, there must be ________ at the extreme end of the load.
1. red lights
2. red flags
3. a red flag - ANSWER-red lights
Compared with a straight truck or bus, there are ________ things to inspect in combination
vehicles.
, 1. fewer
2. more
3. the same number of - ANSWER-more
Glad hands are used to connect the ....
1. kingpin from the trailer to the locking jaws of the fifth wheel
2. electrical lines from the tractor to the trailer
3. service and emergency air lines from the truck or tractor to the trailer - ANSWER-service
and emergency air lines from the truck or tractor to the trailer
How much space should there be between the upper and lower fifth wheel after coupling?
1. Just enough to see light through it
2. About 1/4 inch
3. None - ANSWER-none
If the brakes did not release when you pushed the trailer air supply valve, you should ...
1. cross the air lines,
2. check the air line connections
3. check the electrical cables - ANSWER-check the air line connections
If you do not do the final air brake check for air leaks and fix them before driving,
1. you could lose your brakes while driving
2. your fuel usage will increase
3. tire pressure will drop - ANSWER-you could lose your brakes while driving
In general, the higher your trucks center of gravity, the ...
1. easier it is to turn over
2. more stable it is when turning
3. easier it is to turn around corners - ANSWER-easier it is to turn over
The air leakage rate for a combination vehicle ( engine off, brakes on) should not be more
than _____ psi per minute .
1. 4
2. 6
3. 2 - ANSWER-4
The fifth wheel locking lever is not locked after the jaws close around the kingpin. This
means that
1. the parking lock is off and you may drive away
2. the coupling is not right and should be fixed before you drive the coupled unit
3. the trailer will not swivel on the fifth wheel - ANSWER-the coupling is not right and should
be fixed before you drive the coupled unit
The fifth wheel locking lever is not locked after the jaws close around the kingpin. This
means that...
1. the parking lock is off and you may drive away
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