CDL COMBINATION VEHICLE 2026 EXAM QUESTIONS AND
SOLUTIONS RATED A+
✔✔Check air line connection. - ✔✔If the brakes are not released when you pushed the
trailer air supply valve you should:
✔✔Often do not have spring brakes . - ✔✔Air brake equipped trailers made before
1975:
✔✔Keep the cargo as close to the ground as possible. - ✔✔There are two things that a
driver can do to prevent a rollover. They are:(1) go slow around turns;and (2):
✔✔Supply air to the trailer system , then pull out the air supply knob. - ✔✔After
connecting the air lines but before backing under the trailer you should:
✔✔The shank - ✔✔Which part of the kingpin should the locking jaws close around?
✔✔Nothing - ✔✔How much space should be allowed between upper and lower fifth
wheel after coupling?
✔✔At normal pressure. - ✔✔You have pushed the trailer air supply valve . You should
not back a tractor under a trailer until the whole air system is :
✔✔Supply air to the trailer system, then pull out the air supply knob. - ✔✔You are
coupling tractor to a semitrailer. You have connected the airlines. Before backing under
the trailer you should:
✔✔Fully loaded - ✔✔Tractor with _____trailer requires shortest amount of stopping
Your distance.
✔✔To prevent steering problems. - ✔✔Why should you be sure that the fifth wheel plate
is greased as required?
✔✔90 degree - ✔✔When connecting the glad hands press the two seals with the
coupler together at what degree to each other?
✔✔The emergency and service line. - ✔✔You are coupling a tractor to semitrailer and
have backed up but are not under it. What should you hook up before backing under ?
✔✔Pushing in the trailer air supply valve. - ✔✔You supply air to the trailers tanks by:
✔✔Bobtail tractors can take longer to stop than a combination vehicle loaded to
maximum gross weight. - ✔✔Which of these statements is true?
, ✔✔It will keep dirt or water out of the lines. - ✔✔Why should you lock the tractor glad
hands to each other (or dummy couplers) when you are not towing a trailer?
✔✔Always use the lowest reverse gear . - ✔✔When backing a tractor under a trailer you
should?
✔✔Normal position - ✔✔After the trailer has been coupled to the tractor, the tractor
protection control valve should be placed in what position?
✔✔The coupling is not right and should be fixed before driving the coupled until. -
✔✔The fifth wheel locking lever is not locked after the jaws close around the kingpin.
This means that:
✔✔Tractor towing 45-feet trailer - ✔✔Off-tracking or cheating causes of which of these
to follow the wider pass while making a turn ?
✔✔There is enough clearance between the tractor frame and the landing gear . -
✔✔The iron trailers support are up and the trailer is resting on the tractor. Make sure:
✔✔Make firm contact with the ground , then crackle hits a low gear a few extra turns . -
✔✔When you are uncoupling a loaded trailer you should lower the landing gear until it:
✔✔If the trailer has no spring brakes , you could drive away but you wouldn't have
trailers brakes . - ✔✔What will happen if the air lines are crossed when you hook up to
an old trailer?
✔✔Release the service brakes. - ✔✔To stop a trailer skid you should:
✔✔Red, Blue - ✔✔The air lines on a combination vehicles are often colored to prevent
then from mixing up. The emergency line is ____, the service line is ______.
✔✔More things - ✔✔Compared to a straight truck or bus there are _____ things to
inspect in combination vehicle.
✔✔Emergency - ✔✔When checking the trailer emergency brakes the tractor protection
control valve should be placed in what position ?
✔✔Slightly raised - ✔✔While checking if the trailer is securely coupled to the trailer the
landing gears should be:
✔✔Directly in front of the trailer . - ✔✔When you get ready to back under a semitrailer
you should line up:
SOLUTIONS RATED A+
✔✔Check air line connection. - ✔✔If the brakes are not released when you pushed the
trailer air supply valve you should:
✔✔Often do not have spring brakes . - ✔✔Air brake equipped trailers made before
1975:
✔✔Keep the cargo as close to the ground as possible. - ✔✔There are two things that a
driver can do to prevent a rollover. They are:(1) go slow around turns;and (2):
✔✔Supply air to the trailer system , then pull out the air supply knob. - ✔✔After
connecting the air lines but before backing under the trailer you should:
✔✔The shank - ✔✔Which part of the kingpin should the locking jaws close around?
✔✔Nothing - ✔✔How much space should be allowed between upper and lower fifth
wheel after coupling?
✔✔At normal pressure. - ✔✔You have pushed the trailer air supply valve . You should
not back a tractor under a trailer until the whole air system is :
✔✔Supply air to the trailer system, then pull out the air supply knob. - ✔✔You are
coupling tractor to a semitrailer. You have connected the airlines. Before backing under
the trailer you should:
✔✔Fully loaded - ✔✔Tractor with _____trailer requires shortest amount of stopping
Your distance.
✔✔To prevent steering problems. - ✔✔Why should you be sure that the fifth wheel plate
is greased as required?
✔✔90 degree - ✔✔When connecting the glad hands press the two seals with the
coupler together at what degree to each other?
✔✔The emergency and service line. - ✔✔You are coupling a tractor to semitrailer and
have backed up but are not under it. What should you hook up before backing under ?
✔✔Pushing in the trailer air supply valve. - ✔✔You supply air to the trailers tanks by:
✔✔Bobtail tractors can take longer to stop than a combination vehicle loaded to
maximum gross weight. - ✔✔Which of these statements is true?
, ✔✔It will keep dirt or water out of the lines. - ✔✔Why should you lock the tractor glad
hands to each other (or dummy couplers) when you are not towing a trailer?
✔✔Always use the lowest reverse gear . - ✔✔When backing a tractor under a trailer you
should?
✔✔Normal position - ✔✔After the trailer has been coupled to the tractor, the tractor
protection control valve should be placed in what position?
✔✔The coupling is not right and should be fixed before driving the coupled until. -
✔✔The fifth wheel locking lever is not locked after the jaws close around the kingpin.
This means that:
✔✔Tractor towing 45-feet trailer - ✔✔Off-tracking or cheating causes of which of these
to follow the wider pass while making a turn ?
✔✔There is enough clearance between the tractor frame and the landing gear . -
✔✔The iron trailers support are up and the trailer is resting on the tractor. Make sure:
✔✔Make firm contact with the ground , then crackle hits a low gear a few extra turns . -
✔✔When you are uncoupling a loaded trailer you should lower the landing gear until it:
✔✔If the trailer has no spring brakes , you could drive away but you wouldn't have
trailers brakes . - ✔✔What will happen if the air lines are crossed when you hook up to
an old trailer?
✔✔Release the service brakes. - ✔✔To stop a trailer skid you should:
✔✔Red, Blue - ✔✔The air lines on a combination vehicles are often colored to prevent
then from mixing up. The emergency line is ____, the service line is ______.
✔✔More things - ✔✔Compared to a straight truck or bus there are _____ things to
inspect in combination vehicle.
✔✔Emergency - ✔✔When checking the trailer emergency brakes the tractor protection
control valve should be placed in what position ?
✔✔Slightly raised - ✔✔While checking if the trailer is securely coupled to the trailer the
landing gears should be:
✔✔Directly in front of the trailer . - ✔✔When you get ready to back under a semitrailer
you should line up:
