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2024 CDL - COMBINATION VEHICLE PRACTICE TEST EXAM WITH CORRECT ANSWERS
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2024 CDL - COMBINATION VEHICLE PRACTICE TEST EXAM WITH CORRECT ANSWERS
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2024 CDL - COMBINATIONVEHICLE PRACTICE TEST EXAM
WITH CORRECT ANSWERS
A tractor with a(n) ________ trailer requires the shortest amount of stopping
distance .
1. empty
2. fully loaded
3. lightly loaded - CORRECT-ANSWERSfully 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-ANSWERS4
What gear should the tractor engine be in after you uncouple the trailer and
are inspecting the trailer?
1. neutral
2. low reverse
3. high reverse - CORRECT-ANSWERSneutral
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 ..
1. lifting the brake pedal
2. applying and releasing the trailer brakes and listening for brake sounds
3. turning on the parking brake from the cab - CORRECT-ANSWERSapplying
and releasing the trailer brakes and listening for brake sounds
If the brakes did not release when you pushed the trailer air supply valve,
you should ...
1. cross the air lines,
2. check the air line connections
3. check the electrical cables - CORRECT-ANSWERScheck the air line
connections
You have a major leak in the service line, and you apply the brakes. Service
air pressure will escape and cause the
1. trailer tank pressure to be lost
2. trailer emergency brakes to come on
, 3. tractor spring brakes to lock on - CORRECT-ANSWERStrailer emergency
brakes to come on
You are uncoupling a trailer. After you shut off the trailer air supply and lock
the trailer brakes, you should
1. immediately apply your tractor parking brakes
2. begin to lower the trailer landing gear
3. back up gently and ease pressure on the fifth wheel locking jaws -
CORRECT-ANSWERSback up gently to ease pressure on the fifth wheel
locking jaws
When should you use the hand valve to park a combination vehicle?
1. To park at loading docks
2. To park on a grade
3. never - CORRECT-ANSWERSNever
The front trailer supports are up, and the trailer is resting on the tractor.
Make sure that
1. there is enough clearance between the upper and lower fifth wheel
2. there is enough clearance between the tractor frame and the landing gear
3. the safety latch is in the unlocked position - CORRECT-ANSWERSthere is
enough clearance between the tractor frame and the landing gear
The trailer hand valve works the trailer brakes. Which of these statements is
true?
1. the foot brake sends air to all the brakes on the vehicle ( including the
trailer(s))
2. The trailer hand valve should be used only to test the trailer brakes
3. all the above - CORRECT-ANSWERSall the above
Where should the tractor be when you inspect the landing gear after
uncoupling the trailer?
1. With the fifth wheel directly beneath the kingpin
2. completely cleared from the trailer
3. with the tractor frame under the trailer - CORRECT-ANSWERSwith the
tractor frame under the trailer
After you lock the kingpin into the fifth wheel, you should check the
connection by pulling
1. the tractor ahead gently with the trailer brakes locked
2. forward 50 feet, then turning right, and then left
3. the tractor ahead sharply to release the trailer brakes - CORRECT-
ANSWERSthe tractor ahead gently with the trailer brakes locked
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