Combination

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    Which part of the kingpin should the locking jaws close around?

    • The base
    • The shank
    • The head
    • All of the above
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Algebra Quizzes & Trivia

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  • 2. 

    When you get ready to back under a semitrailer, you should line up

    • The left rear outside dual wheel with the kingpin

    • The kingpin with the edge of the drivers side locking jaw

    • Directly in front of the trailer

    • All of the above

    Correct Answer
    A. Directly in front of the trailer
  • 3. 

    After the trailer has been coupled tot he tractor, the tractor protection control valve should be placed in the ________ position

    • Up

    • Down

    • Normal

    • All of the above

    Correct Answer
    A. Normal
  • 4. 

    After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. You do this by

    • Applying/releasing the trailer brakes and listening for brake sounds

    • Turning on the parking brakes from the cab

    • Watching your mirrors to see if the trailer lights come on

    • All of the above

    Correct Answer
    A. Applying/releasing the trailer brakes and listening for brake sounds
  • 5. 

    Under good driving conditions, you should leave at least one second of space between your vehicle and the vehicle ahead for every __________ feet of your vehicles length

    • 30

    • 20

    • 10

    • All of the above

    Correct Answer
    A. 10
  • 6. 

    There are two things that can prevent a rollover. They are: (1) keep the cargo as close to the ground as possible; and (2)

    • Keep both hands firmly on the steering wheel

    • Go slow around turns

    • Make sure the brakes are properly adjusted

    • None of the above

    Correct Answer
    A. Go slow around turns
  • 7. 

    The fifth wheel locking lever is not locked after the jaws close around the kingpin. this means that

    • The parking lock is off and may drive away

    • The trailer will not swivel on the fifth wheel

    • The coupling is not right and should be fixed before driving the coupled unit

    • All of the above

    Correct Answer
    A. The coupling is not right and should be fixed before driving the coupled unit
  • 8. 

    You should not back a tractor under a trailer until the whole air system is

    • At normal pressure

    • Empty

    • Between 60 and 80 psi

    • All of the above

    Correct Answer
    A. At normal pressure
  • 9. 

    Compared to a straight truck or bus, there are _____ things to inspect on a combination vehicle

    • More

    • Fewer

    • The same number of

    • All of the above

    Correct Answer
    A. More
  • 10. 

    In general, the higher your truck's "center of gravity" the

    • Easier it is to turn over

    • Easier it is to turn around corners

    • More stable it is when turning

    • All of the above

    Correct Answer
    A. Easier it is to turn over
  • 11. 

    Why should you be sure that the fifth wheel plate is greased as required?

    • To prevent steering problems

    • To reduces heat and noise

    • To ensure good electrical connection

    • None of the above

    Correct Answer
    A. To prevent steering problems
  • 12. 

    When backing a tractor under a trailer you should

    • Do it quickly to ensure that the kingpin is locked into the fifth wheel

    • Always approach the trailer at a slight angle

    • Always use the lowest reverse gear

    • All of the above

    Correct Answer
    A. Always use the lowest reverse gear
  • 13. 

    You are coupling a tractor to a semitrailer. You have backed up but are not under it. what should you hook up before backing under the semitrailer?

    • Nothing, back up and lock the fifth wheel

    • The electrical service cable

    • The emergency and service air lines

    • All of the above

    Correct Answer
    A. The emergency and service air lines
  • 14. 

    To unlock the fifth wheel, pull the release handle to the _______ position

    • Closed

    • Neutral

    • Open

    • All of the above

    Correct Answer
    A. Open
  • 15. 

    After you have coupled the trailer, you should begin raising the landing gear by raising the ______ gear.

    • Mid-level

    • Low

    • High

    • Option 4

    Correct Answer
    A. Low
  • 16. 

    Why should you lick the air line glad hands to each other (or dummy couplers) when you are not towing a trailer?

    • It will keep water out of the lines

    • If you do not, you could never build system pressure

    • The connected brake circuit becomes a back up air tank

    • All of the above

    Correct Answer
    A. It will keep water out of the lines
  • 17. 

    The best way to tell if your trailer has tarted to skid is to:

    • Feel for "pulling" in the cab

    • Hear the wheels skidding

    • See it in your mirrors

    • None of the above

    Correct Answer
    A. See it in your mirrors
  • 18. 

    You want to inspect the trailer supports. You should place the tractor transmission in which gear after you have uncoupled the trailer?

    • Low revers

    • High reverse

    • Neutral

    • All of the above

    Correct Answer
    A. Neutral
  • 19. 

    After you lock the kingpin into the fifth wheel, you should check the connection by pulling

    • The tractor ahead gently with the trailer brakes locked

    • Forward 50 feet, turning right, and left

    • The tractor ahead sharply to release the trailer brakes

    • None of the above

    Correct Answer
    A. The tractor ahead gently with the trailer brakes locked
  • 20. 

    After you connect the air lines, but before you back under the trailer, you should

    • Make sure the trailer brakes are off

    • Walk around the rig to be sure it is clear

    • Supply air to the trailer system, then pull out the air supply knob

    • All of the above

    Correct Answer
    A. Supply air to the trailer system, then pull out the air supply knob
  • 21. 

    You have pushed in the trailer supply valve. You should not move the tractor until the whole air system is:

    • At normal pressure

    • Between 60 and 80 psi

    • Empty

    • All of the above

    Correct Answer
    A. At normal pressure
  • 22. 

    Which of these vehicles off-track the most

    • 5-axle tractor towing a 42-foot trailer

    • 5-axle tractor towing a 45-foot trailer

    • 5-axle tractor towing a 52-foot trailer

    • None of the above

    Correct Answer
    A. 5-axle tractor towing a 52-foot trailer
  • 23. 

    A trailer is most likely to jackknife when it is

    • Empty

    • Over loaded

    • Loaded to full capacity

    • All of the above

    Correct Answer
    A. Empty
  • 24. 

    If you have coupled with a semitrailer, where should the front trailer supports be before driving away?

    • Raised 3/4 way with the crank handle removed

    • Raised 1/2 way with the crank handle secured in its bracket

    • Fully raised with the crank handle secured in its bracket

    • None of the above

    Correct Answer
    A. Fully raised with the crank handle secured in its bracket
  • 25. 

    Air and electric lines from the tractor to the trailer should be

    • Secured, but with enough slack for turns

    • Resting on the frame of the tractor

    • Pulled tight, with very little slack

    • All of the above

    Correct Answer
    A. Secured, but with enough slack for turns
  • 26. 

    When should you use chocks to park a trailer not equipped with spiring brakes?

    • Only when it will be parked on an incline

    • Never

    • Always

    • All of the above

    Correct Answer
    A. Always
  • 27. 

    A tractor with a (n) ______ trailer requires the shortest stopping distance

    • Lightly loaded

    • Fully loaded

    • Empty

    • None of the above

    Correct Answer
    A. Fully loaded
  • 28. 

    How much space should be between the upper and lower fifth wheel after coupling

    • Just enough to see light through it

    • None

    • About 1/4 inch

    • All of the above

    Correct Answer
    A. None
  • 29. 

    You are coupling a semitrailer to your tractor but have not backed under it. the trailer is at the right height when

    • The kingpin is about 1 1/4 inches above the fifth wheel

    • It is raised slightly when the tractor is backed under it

    • The end of the kingpin is even with the top of the fifth wheel

    • All of the above

    Correct Answer
    A. It is raised slightly when the tractor is backed under it
  • 30. 

    Before you back under a truck trailer, make sure the :

    • Air supply knob is in

    • Air brakes are off

    • Trailer brakes are locked

    • All of the above

    Correct Answer
    A. Trailer brakes are locked
  • 31. 

    If you cannot make a turn without entering another traffic lane, you should

    • Not make that turn

    • Turn wide before you start your turn

    • Turn wide as you complete your turn

    • All of the above

    Correct Answer
    A. Turn wide as you complete your turn
  • 32. 

    When you are uncoupling a loaded trailer, lower the landing gear until it

    • Makes contact with the ground and lifts the trailer off of the fifth wheel

    • Makes firm contact with the ground

    • Just reaches the ground

    • All of the above

    Correct Answer
    A. Makes firm contact with the ground
  • 33. 

    Which statement is true

    • Light vehicles need more braking power to stop than heavy ones

    • "bobtail" tractors can take longer to stop than a combination vehicle loaded

    • The brake and suspension systems of combination vehicles work best with a light load

    • None of the above

    Correct Answer
    A. "bobtail" tractors can take longer to stop than a combination vehicle loaded
  • 34. 

    To stop a trailer skid you should

    • Counter steer

    • Use the trailer hand brake

    • Release the brake

    • All of the above

    Correct Answer
    A. Release the brake
  • 35. 

    For a coupling to be completed, the safety catch for the fifth wheel locking lever must be 

    • Straight up

    • Over the locking lever

    • Through the locking lever

    • None of the above

    Correct Answer
    A. Over the locking lever
  • 36. 

    Glad hands are used to connect the 

    • Kingpin from the tractor to the locking jaws on the glide plate

    • Electric lines from the truck to the trailer

    • Service and emergency air lines from the truck to the trailer

    • All of the above

    Correct Answer
    A. Service and emergency air lines from the truck to the trailer
  • 37. 

    When coupling, the proper position of the fifth wheel is

    • Tilted down towards the end of the tractor

    • Level with the ground

    • Tilted up towards the end of the tractor

    • All of the above

    Correct Answer
    A. Tilted down towards the end of the tractor
  • 38. 

    The front trailer supports are up and the trailer is resting on the tractor. Make sure

    • There is enough clearance between the tractor frame and the landing gear

    • There is enough clearance between the upper and lower fifth wheel

    • The safety latch is in the unlocked position

    • All of the above

    Correct Answer
    A. There is enough clearance between the tractor frame and the landing gear
  • 39. 

    You are uncoupling a trailer. After you shut off the trailer air supply and lock the trailer brakes, you should

    • Immediately put on your tractor parking brakes

    • Back up gently to ease pressure on the fifth wheel locking jaws

    • Begin to lower the trailer landing gear

    • All of the above

    Correct Answer
    A. Back up gently to ease pressure on the fifth wheel locking jaws
  • 40. 

    When checking the trailers emergency brakes, the tractor protection control valve should be placed in the _______ position

    • Emergency

    • Neutral

    • Normal

    • All of the above

    Correct Answer
    A. Emergency
  • 41. 

    When checking that the trailer is securely coupled to the tractor, the landing gear should be

    • Full lowered

    • Fully raised

    • Slightly raised

    • All of the above

    Correct Answer
    A. Slightly raised

Quiz Review Timeline (Updated): Nov 1, 2016 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Nov 01, 2016
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 24, 2016
    Quiz Created by
    One_militantmind
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