Combination TEXAS CDL QUESTIONS &
ANSWERS BEST EXAM SOLUTION
LATEST UPDATE 2025/2026 RATED A+
You are coupling a semi-trailer to your tractor but have not yet backed under, the trailer is at the rigt
height when:
A- It will be raised slightly when the tractor is backed under it
B- The kingpin is about 1-1/4 inches above the fifth wheel
C- The end of the kingpin is even with the top of the fifth wheel - CORRECT ANSWERS A
You should not back a tractor under a trailer until the whole air system is:
A- Between 60 and 80 PSI
B- At normal pressure
C- Empty - CORRECT ANSWERS B
When you get ready to back under the semi-trailer you should line up:
A- About 12 degrees off the line of the trailer
B- The kingpin to engage the drivers side locking jaw first
C- Directly in front of the trailer - CORRECT ANSWERS C
When you get ready to back under the semi trailer you should line up:
,A- About 12 degrees off the line of the trailer
B- The kingpin to engage the drivers side locking jaw first
C- Directly in front of the trailer - CORRECT ANSWERS C
How should you test the tractor semi-trailer connection for security?
A- Pull gently forward in low gear against the locked trailer brakes, then look at it carefully
B- Put the tractor in gear and pull ahead with a sharp jerk
C- Rock the trailer back and forth with the trailer brakes locked - CORRECT ANSWERS A
When should you use the hand valve to park a combination vehicle?
A- To park at loading docks
B- Never
C- To park on a grade - CORRECT ANSWERS B
You supply air to the trailer tanks by
a) Pulling out the trailer air supply valve
b) Pushing in the trailer air supply valve
c) Connecting the service line glad hand - CORRECT ANSWERS A
Why should you be sure that the fifth wheen plate is greased as required?
A- To reduce heat and noise
, B- To prevent steering problems
C- To ensure good electrical connections - CORRECT ANSWERS B
After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are
working. This is done by:
A- Applying and releasing the trailer brakes and listening for brake sounds
B- Lifting the brake pedal
C- Turning on the parking brakes from the cab - CORRECT ANSWERS A
There are two things that a driver can do to prevent a rollover. They are (1) keep the carge as close to
the ground as possible; and (2):
A- Make sure that the brakes are properly adjusted
B- Keep the fifth wheels free play as tight as possible
C- Go slowly around turns - CORRECT ANSWERS C
Before you back under a trailer, make sure the:
A- Air supply knob is in
B- Air brakes are off
C- Trailer brakes are locked - CORRECT ANSWERS C
If the service air line comes apart while you are driving a combination vehicle but the emergency line
stays together, what will happen right away?
A- Nothing is likely to happen until you try to apply the brakes
ANSWERS BEST EXAM SOLUTION
LATEST UPDATE 2025/2026 RATED A+
You are coupling a semi-trailer to your tractor but have not yet backed under, the trailer is at the rigt
height when:
A- It will be raised slightly when the tractor is backed under it
B- The kingpin is about 1-1/4 inches above the fifth wheel
C- The end of the kingpin is even with the top of the fifth wheel - CORRECT ANSWERS A
You should not back a tractor under a trailer until the whole air system is:
A- Between 60 and 80 PSI
B- At normal pressure
C- Empty - CORRECT ANSWERS B
When you get ready to back under the semi-trailer you should line up:
A- About 12 degrees off the line of the trailer
B- The kingpin to engage the drivers side locking jaw first
C- Directly in front of the trailer - CORRECT ANSWERS C
When you get ready to back under the semi trailer you should line up:
,A- About 12 degrees off the line of the trailer
B- The kingpin to engage the drivers side locking jaw first
C- Directly in front of the trailer - CORRECT ANSWERS C
How should you test the tractor semi-trailer connection for security?
A- Pull gently forward in low gear against the locked trailer brakes, then look at it carefully
B- Put the tractor in gear and pull ahead with a sharp jerk
C- Rock the trailer back and forth with the trailer brakes locked - CORRECT ANSWERS A
When should you use the hand valve to park a combination vehicle?
A- To park at loading docks
B- Never
C- To park on a grade - CORRECT ANSWERS B
You supply air to the trailer tanks by
a) Pulling out the trailer air supply valve
b) Pushing in the trailer air supply valve
c) Connecting the service line glad hand - CORRECT ANSWERS A
Why should you be sure that the fifth wheen plate is greased as required?
A- To reduce heat and noise
, B- To prevent steering problems
C- To ensure good electrical connections - CORRECT ANSWERS B
After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are
working. This is done by:
A- Applying and releasing the trailer brakes and listening for brake sounds
B- Lifting the brake pedal
C- Turning on the parking brakes from the cab - CORRECT ANSWERS A
There are two things that a driver can do to prevent a rollover. They are (1) keep the carge as close to
the ground as possible; and (2):
A- Make sure that the brakes are properly adjusted
B- Keep the fifth wheels free play as tight as possible
C- Go slowly around turns - CORRECT ANSWERS C
Before you back under a trailer, make sure the:
A- Air supply knob is in
B- Air brakes are off
C- Trailer brakes are locked - CORRECT ANSWERS C
If the service air line comes apart while you are driving a combination vehicle but the emergency line
stays together, what will happen right away?
A- Nothing is likely to happen until you try to apply the brakes
