Page 1 of 16
CDL - COMBINATION VEHICLE PRACTICE
TEST EXAM NEWEST QUESTIONS AND
CORRECT DETAILED ANSWERS LATEST EXAM
UPDATE GRADED A+
When you are uncoupling a loaded trailer, lower the landing gear until it
...
1. reaches the ground
2. makes firm contact with the ground
3. makes contact with the ground, and leave the trailer off the fifth
wheel - ✔✔✔ Correct Answer > makes firm contact with the ground
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 - ✔✔✔ Correct Answer > none
,Page 2 of 16
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 - ✔✔✔ Correct Answer > low gear
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 - ✔✔✔ Correct Answer > the
coupling is not right and should be fixed before you drive the coupled
unit
A tractor with a(n) ________ trailer requires the shortest amount of
stopping distance .
, Page 3 of 16
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
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
CDL - COMBINATION VEHICLE PRACTICE
TEST EXAM NEWEST QUESTIONS AND
CORRECT DETAILED ANSWERS LATEST EXAM
UPDATE GRADED A+
When you are uncoupling a loaded trailer, lower the landing gear until it
...
1. reaches the ground
2. makes firm contact with the ground
3. makes contact with the ground, and leave the trailer off the fifth
wheel - ✔✔✔ Correct Answer > makes firm contact with the ground
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 - ✔✔✔ Correct Answer > none
,Page 2 of 16
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 - ✔✔✔ Correct Answer > low gear
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 - ✔✔✔ Correct Answer > the
coupling is not right and should be fixed before you drive the coupled
unit
A tractor with a(n) ________ trailer requires the shortest amount of
stopping distance .
, Page 3 of 16
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
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
