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CDL - COMBINATION VEHICLE PRACTICE TEST
2025| BRANDNEW ACTUAL EXAM WITH 100%
VERIFIED QUESTIONS AND CORRECT
ANSWERS| GUARANTEED VALUE PACK| ACE
YOUR GRADES.
A tractor with a(n) ________ trailer requires the shortest amount of
stopping distance .
1. empty
2. fully loaded
3. lightly loaded - Correct Answer-fully loaded
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 - Correct Answer-4
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
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3. tire pressure will drop - Correct Answer-you could lose your brakes while
driving
Which part of the kingpin should the locking jaws close around? - Correct
Answer-The shank
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 -
Correct Answer-service and emergency air lines from the truck or tractor to
the trailer
Trucks roll over more easily when fully loaded and are
1. ten times more likely to roll over in a crash than empty rigs
2. five times more likely to roll over in a crash than empty rigs
3. two times more likely to roll over in a crash than empty rigs - Correct
Answer-ten times more likely to roll over in a crash than empty rigs
In general, the higher your trucks center of gravity, the ...
1. easier it is to turn over
2. more stable it is when turning
CDL - COMBINATION VEHICLE PRACTICE TEST
2025| BRANDNEW ACTUAL EXAM WITH 100%
VERIFIED QUESTIONS AND CORRECT
ANSWERS| GUARANTEED VALUE PACK| ACE
YOUR GRADES.
A tractor with a(n) ________ trailer requires the shortest amount of
stopping distance .
1. empty
2. fully loaded
3. lightly loaded - Correct Answer-fully loaded
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 - Correct Answer-4
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
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3. tire pressure will drop - Correct Answer-you could lose your brakes while
driving
Which part of the kingpin should the locking jaws close around? - Correct
Answer-The shank
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 -
Correct Answer-service and emergency air lines from the truck or tractor to
the trailer
Trucks roll over more easily when fully loaded and are
1. ten times more likely to roll over in a crash than empty rigs
2. five times more likely to roll over in a crash than empty rigs
3. two times more likely to roll over in a crash than empty rigs - Correct
Answer-ten times more likely to roll over in a crash than empty rigs
In general, the higher your trucks center of gravity, the ...
1. easier it is to turn over
2. more stable it is when turning
