CDLT 146 CDL Combination Latest Midterm Exam 2026
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After coupling, how much space should there be between the lower and
upper fifth wheel?
a) 1 foot
b) 24-36 inches
c) None
d) 5 feet
ANSWERS: c) None
While uncoupling, what should you do AFTER you unlock the fifth wheel?
a) Lower your landing gear
b) Disconnect your air lines
c) Position your rig
d) Pull the tractor forward so that it is partially clear of the trailer
ANSWERS: d) Pull the tractor forward so that it is partially clear of the trailer
, Which of the following types of vehicle gets stuck on railroad crossings
most often?
a) Single-axle tractors pulling a long trailer with its landing gear set for a
tandem-axle tractor
b) Car carriers
c) Moving vans
d) All of the above
ANSWERS: d) All of the above
Which of the following could happen if you try to couple when the
trailer is too high?
a) It might not couple correctly
b) You could damage the trailer nose
c) The tractor might strike and damage the trailer
d) The tractor could roll away
a) ANSWERS: It might not couple correctly
,Which of the following is NOT part of checking that air is flowing to all
trailers?
a) Going to the rear of the rig
b) Pressing the pedal several times to lower the air pressure
c) Pushing in the red "trailer air supply" knob
d) Opening the emergency line shut-off valve
ANSWERS: b) Pressing the pedal several times to lower the air pressure
Which of the following is NOT part of testing the tractor protection
valve?
a) Pulling forward slowly, then applying the trailer brakes
b) Pressing the brake pedal sever times to release air
c) Charging the trailer's air brake system first
d) Shutting off the engine
a) ANSWERS: Pulling forward slowly, then applying the trailer brakes
, During a walkaround inspection of a combination vehicle, you should
check to make sure that
a) The kingpin is not damaged
b) All locking pins are present and locked in place
c) The landing gear is fully raised
d) All of the above are true
ANSWERS: d) All of the above are true
Where would you find the shut-off valves?
a) In the front of a trailer
b) In the front of the tractor
c) In the rear of the tractor
d) In the rear of a trailer
ANSWERS: d) In the rear of a trailer
What is the best way to test the trailer service brakes?
a) Pull forward very quickly, then apply the trailer brakes with your hand
control
b) Try putting the hand brake on when you are on a deserted road
c) Accelerate to the maximum speed possible in a parking lot, then apply
the trailer brakes
d) Pull forward very slowly, then apply the trailer brakes with your hand
control
ANSWERS: d) Pull forward very slowly, then apply the trailer brakes with
your hand control
With The Most Recent Questions 2026|2027 Actual
Complete Real Exam Questions And Correct Answers
(Verified Answers) Already Graded A+ | Guaranteed
Success!! Newest Exam | Just Released!!San Juan
College
After coupling, how much space should there be between the lower and
upper fifth wheel?
a) 1 foot
b) 24-36 inches
c) None
d) 5 feet
ANSWERS: c) None
While uncoupling, what should you do AFTER you unlock the fifth wheel?
a) Lower your landing gear
b) Disconnect your air lines
c) Position your rig
d) Pull the tractor forward so that it is partially clear of the trailer
ANSWERS: d) Pull the tractor forward so that it is partially clear of the trailer
, Which of the following types of vehicle gets stuck on railroad crossings
most often?
a) Single-axle tractors pulling a long trailer with its landing gear set for a
tandem-axle tractor
b) Car carriers
c) Moving vans
d) All of the above
ANSWERS: d) All of the above
Which of the following could happen if you try to couple when the
trailer is too high?
a) It might not couple correctly
b) You could damage the trailer nose
c) The tractor might strike and damage the trailer
d) The tractor could roll away
a) ANSWERS: It might not couple correctly
,Which of the following is NOT part of checking that air is flowing to all
trailers?
a) Going to the rear of the rig
b) Pressing the pedal several times to lower the air pressure
c) Pushing in the red "trailer air supply" knob
d) Opening the emergency line shut-off valve
ANSWERS: b) Pressing the pedal several times to lower the air pressure
Which of the following is NOT part of testing the tractor protection
valve?
a) Pulling forward slowly, then applying the trailer brakes
b) Pressing the brake pedal sever times to release air
c) Charging the trailer's air brake system first
d) Shutting off the engine
a) ANSWERS: Pulling forward slowly, then applying the trailer brakes
, During a walkaround inspection of a combination vehicle, you should
check to make sure that
a) The kingpin is not damaged
b) All locking pins are present and locked in place
c) The landing gear is fully raised
d) All of the above are true
ANSWERS: d) All of the above are true
Where would you find the shut-off valves?
a) In the front of a trailer
b) In the front of the tractor
c) In the rear of the tractor
d) In the rear of a trailer
ANSWERS: d) In the rear of a trailer
What is the best way to test the trailer service brakes?
a) Pull forward very quickly, then apply the trailer brakes with your hand
control
b) Try putting the hand brake on when you are on a deserted road
c) Accelerate to the maximum speed possible in a parking lot, then apply
the trailer brakes
d) Pull forward very slowly, then apply the trailer brakes with your hand
control
ANSWERS: d) Pull forward very slowly, then apply the trailer brakes with
your hand control
