CDL - Combination Vehicle Practice Test Complete
Questions And Answers
, CDL - Combination Vehicle Practice Test Complete
Questions And Answers
A tractor with a(n) ________ trailer requires the shortest amount of stopping distance .
1. empty
2. fully loaded
3. lightly loaded - correct answersfully 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 answers4
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 - correct answersyou could lose your brakes while driving
Which part of the kingpin should the locking jaws close around? - correct answersThe
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
answersservice 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 answersten
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
3. easier it is to turn around corners - correct answerseasier it is to turn over
You are driving a combination vehicle when the trailer breaks away, pulling apart both
air lines. You would expect the trailer brakes to come on and ...
1. the tractor to lose all air pressure
2. the tractor protection valve to close
3. the trailer supply valve to stay open - correct answersthe tractor protection valve to
close
Questions And Answers
, CDL - Combination Vehicle Practice Test Complete
Questions And Answers
A tractor with a(n) ________ trailer requires the shortest amount of stopping distance .
1. empty
2. fully loaded
3. lightly loaded - correct answersfully 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 answers4
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 - correct answersyou could lose your brakes while driving
Which part of the kingpin should the locking jaws close around? - correct answersThe
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
answersservice 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 answersten
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
3. easier it is to turn around corners - correct answerseasier it is to turn over
You are driving a combination vehicle when the trailer breaks away, pulling apart both
air lines. You would expect the trailer brakes to come on and ...
1. the tractor to lose all air pressure
2. the tractor protection valve to close
3. the trailer supply valve to stay open - correct answersthe tractor protection valve to
close
