CDL - Combination Vehicle Practice Test / Newest Actual Exam Revie
CDL - Combination Vehicle Practice Test
Q&A with Definitive Answers / A+ Score Solutions.
Study online at https://quizlet.com/_3kpf9c
1. A tractor with a(n) ________ trailer requires the shortest fully loaded
amount of stopping distance .
1. empty
2. fully loaded
3. lightly loaded
2. The air leakage rate for a combination vehicle ( engine 4
off, brakes on) should not be more than _____ psi per
minute .
1. 4
2. 6
3. 2
3. If you do not do the final air brake check for air leaks you could lose your brakes
and fix them before driving, while driving
1. you could lose your brakes while driving
2. your fuel usage will increase
3. tire pressure will drop
4. Which part of the kingpin should the locking jaws close The shank
around?
5. Glad hands are used to connect the .... service and emergency air
1. kingpin from the trailer to the locking jaws of the lines from the truck or trac-
fifth wheel tor to the trailer
2. electrical lines from the tractor to the trailer
3. service and emergency air lines from the truck or
tractor to the trailer
6. Trucks roll over more easily when fully loaded and are ten times more likely to roll
1. ten times more likely to roll over in a crash than over in a crash than empty
empty rigs rigs
2. five times more likely to roll over in a crash than
1/8
, CDL - Combination Vehicle Practice Test
Study online at https://quizlet.com/_3kpf9c
empty rigs
3. two times more likely to roll over in a crash than
empty rigs
7. In general, the higher your trucks center of gravity, the easier it is to turn over
...
1. easier it is to turn over
2. more stable it is when turning
3. easier it is to turn around corners
8. You are driving a combination vehicle when the trailer the tractor protection valve
breaks away, pulling apart both air lines. You would to close
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
9. When you drive a set of doubles, which shut-off valve back section
must be closed in the last trailer?
1. Middle section
2. front section
3. back section
10. The fifth wheel locking lever is not locked after the jaws the coupling is not right
close around the kingpin. This means that... and should be fixed before
1. the parking lock is off and you may drive away you drive the coupled unit
2. the trailer will not swivel on the fifth wheel
3. the coupling is not right and should be fixed before
you drive the coupled unit
11. What gear should the tractor engine be in after you neutral
uncouple the trailer and are inspecting the trailer?
1. neutral
2/8
CDL - Combination Vehicle Practice Test
Q&A with Definitive Answers / A+ Score Solutions.
Study online at https://quizlet.com/_3kpf9c
1. A tractor with a(n) ________ trailer requires the shortest fully loaded
amount of stopping distance .
1. empty
2. fully loaded
3. lightly loaded
2. The air leakage rate for a combination vehicle ( engine 4
off, brakes on) should not be more than _____ psi per
minute .
1. 4
2. 6
3. 2
3. If you do not do the final air brake check for air leaks you could lose your brakes
and fix them before driving, while driving
1. you could lose your brakes while driving
2. your fuel usage will increase
3. tire pressure will drop
4. Which part of the kingpin should the locking jaws close The shank
around?
5. Glad hands are used to connect the .... service and emergency air
1. kingpin from the trailer to the locking jaws of the lines from the truck or trac-
fifth wheel tor to the trailer
2. electrical lines from the tractor to the trailer
3. service and emergency air lines from the truck or
tractor to the trailer
6. Trucks roll over more easily when fully loaded and are ten times more likely to roll
1. ten times more likely to roll over in a crash than over in a crash than empty
empty rigs rigs
2. five times more likely to roll over in a crash than
1/8
, CDL - Combination Vehicle Practice Test
Study online at https://quizlet.com/_3kpf9c
empty rigs
3. two times more likely to roll over in a crash than
empty rigs
7. In general, the higher your trucks center of gravity, the easier it is to turn over
...
1. easier it is to turn over
2. more stable it is when turning
3. easier it is to turn around corners
8. You are driving a combination vehicle when the trailer the tractor protection valve
breaks away, pulling apart both air lines. You would to close
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
9. When you drive a set of doubles, which shut-off valve back section
must be closed in the last trailer?
1. Middle section
2. front section
3. back section
10. The fifth wheel locking lever is not locked after the jaws the coupling is not right
close around the kingpin. This means that... and should be fixed before
1. the parking lock is off and you may drive away you drive the coupled unit
2. the trailer will not swivel on the fifth wheel
3. the coupling is not right and should be fixed before
you drive the coupled unit
11. What gear should the tractor engine be in after you neutral
uncouple the trailer and are inspecting the trailer?
1. neutral
2/8
