Combination

41 Questions | Total Attempts: 133

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Combination Quizzes & Trivia

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Questions and Answers
  • 1. 
    The best way to tell if your trailer has tarted to skid is to:
    • A. 

      Feel for "pulling" in the cab

    • B. 

      Hear the wheels skidding

    • C. 

      See it in your mirrors

    • D. 

      None of the above

  • 2. 
    You have pushed in the trailer supply valve. You should not move the tractor until the whole air system is:
    • A. 

      At normal pressure

    • B. 

      Between 60 and 80 psi

    • C. 

      Empty

    • D. 

      All of the above

  • 3. 
    Which part of the kingpin should the locking jaws close around?
    • A. 

      The base

    • B. 

      The shank

    • C. 

      The head

    • D. 

      All of the above

  • 4. 
    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
    • A. 

      30

    • B. 

      20

    • C. 

      10

    • D. 

      All of the above

  • 5. 
    Which of these vehicles off-track the most
    • A. 

      5-axle tractor towing a 42-foot trailer

    • B. 

      5-axle tractor towing a 45-foot trailer

    • C. 

      5-axle tractor towing a 52-foot trailer

    • D. 

      None of the above

  • 6. 
    A tractor with a (n) ______ trailer requires the shortest stopping distance
    • A. 

      Lightly loaded

    • B. 

      Fully loaded

    • C. 

      Empty

    • D. 

      None of the above

  • 7. 
    A trailer is most likely to jackknife when it is
    • A. 

      Empty

    • B. 

      Over loaded

    • C. 

      Loaded to full capacity

    • D. 

      All of the above

  • 8. 
    When checking that the trailer is securely coupled to the tractor, the landing gear should be
    • A. 

      Full lowered

    • B. 

      Fully raised

    • C. 

      Slightly raised

    • D. 

      All of the above

  • 9. 
    If you have coupled with a semitrailer, where should the front trailer supports be before driving away?
    • A. 

      Raised 3/4 way with the crank handle removed

    • B. 

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

    • C. 

      Fully raised with the crank handle secured in its bracket

    • D. 

      None of the above

  • 10. 
    You want to inspect the trailer supports. You should place the tractor transmission in which gear after you have uncoupled the trailer?
    • A. 

      Low revers

    • B. 

      High reverse

    • C. 

      Neutral

    • D. 

      All of the above

  • 11. 
    There are two things that can prevent a rollover. They are: (1) keep the cargo as close to the ground as possible; and (2)
    • A. 

      Keep both hands firmly on the steering wheel

    • B. 

      Go slow around turns

    • C. 

      Make sure the brakes are properly adjusted

    • D. 

      None of the above

  • 12. 
    The fifth wheel locking lever is not locked after the jaws close around the kingpin. this means that
    • A. 

      The parking lock is off and may drive away

    • B. 

      The trailer will not swivel on the fifth wheel

    • C. 

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

    • D. 

      All of the above

  • 13. 
    When you are uncoupling a loaded trailer, lower the landing gear until it
    • A. 

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

    • B. 

      Makes firm contact with the ground

    • C. 

      Just reaches the ground

    • D. 

      All of the above

  • 14. 
    The front trailer supports are up and the trailer is resting on the tractor. Make sure
    • A. 

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

    • B. 

      There is enough clearance between the upper and lower fifth wheel

    • C. 

      The safety latch is in the unlocked position

    • D. 

      All of the above

  • 15. 
    Glad hands are used to connect the 
    • A. 

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

    • B. 

      Electric lines from the truck to the trailer

    • C. 

      Service and emergency air lines from the truck to the trailer

    • D. 

      All of the above

  • 16. 
    How much space should be between the upper and lower fifth wheel after coupling
    • A. 

      Just enough to see light through it

    • B. 

      None

    • C. 

      About 1/4 inch

    • D. 

      All of the above

  • 17. 
    You should not back a tractor under a trailer until the whole air system is
    • A. 

      At normal pressure

    • B. 

      Empty

    • C. 

      Between 60 and 80 psi

    • D. 

      All of the above

  • 18. 
    Compared to a straight truck or bus, there are _____ things to inspect on a combination vehicle
    • A. 

      More

    • B. 

      Fewer

    • C. 

      The same number of

    • D. 

      All of the above

  • 19. 
    You are coupling a semitrailer to your tractor but have not backed under it. the trailer is at the right height when
    • A. 

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

    • B. 

      It is raised slightly when the tractor is backed under it

    • C. 

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

    • D. 

      All of the above

  • 20. 
    When checking the trailers emergency brakes, the tractor protection control valve should be placed in the _______ position
    • A. 

      Emergency

    • B. 

      Neutral

    • C. 

      Normal

    • D. 

      All of the above

  • 21. 
    Which statement is true
    • A. 

      Light vehicles need more braking power to stop than heavy ones

    • B. 

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

    • C. 

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

    • D. 

      None of the above

  • 22. 
    In general, the higher your truck's "center of gravity" the
    • A. 

      Easier it is to turn over

    • B. 

      Easier it is to turn around corners

    • C. 

      More stable it is when turning

    • D. 

      All of the above

  • 23. 
    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?
    • A. 

      Nothing, back up and lock the fifth wheel

    • B. 

      The electrical service cable

    • C. 

      The emergency and service air lines

    • D. 

      All of the above

  • 24. 
    Air and electric lines from the tractor to the trailer should be
    • A. 

      Secured, but with enough slack for turns

    • B. 

      Resting on the frame of the tractor

    • C. 

      Pulled tight, with very little slack

    • D. 

      All of the above

  • 25. 
    If you cannot make a turn without entering another traffic lane, you should
    • A. 

      Not make that turn

    • B. 

      Turn wide before you start your turn

    • C. 

      Turn wide as you complete your turn

    • D. 

      All of the above

  • 26. 
    When should you use chocks to park a trailer not equipped with spiring brakes?
    • A. 

      Only when it will be parked on an incline

    • B. 

      Never

    • C. 

      Always

    • D. 

      All of the above

  • 27. 
    When coupling, the proper position of the fifth wheel is
    • A. 

      Tilted down towards the end of the tractor

    • B. 

      Level with the ground

    • C. 

      Tilted up towards the end of the tractor

    • D. 

      All of the above

  • 28. 
    To stop a trailer skid you should
    • A. 

      Counter steer

    • B. 

      Use the trailer hand brake

    • C. 

      Release the brake

    • D. 

      All of the above

  • 29. 
    After you lock the kingpin into the fifth wheel, you should check the connection by pulling
    • A. 

      The tractor ahead gently with the trailer brakes locked

    • B. 

      Forward 50 feet, turning right, and left

    • C. 

      The tractor ahead sharply to release the trailer brakes

    • D. 

      None of the above

  • 30. 
    You are uncoupling a trailer. After you shut off the trailer air supply and lock the trailer brakes, you should
    • A. 

      Immediately put on your tractor parking brakes

    • B. 

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

    • C. 

      Begin to lower the trailer landing gear

    • D. 

      All of the above

  • 31. 
    To unlock the fifth wheel, pull the release handle to the _______ position
    • A. 

      Closed

    • B. 

      Neutral

    • C. 

      Open

    • D. 

      All of the above

  • 32. 
    For a coupling to be completed, the safety catch for the fifth wheel locking lever must be 
    • A. 

      Straight up

    • B. 

      Over the locking lever

    • C. 

      Through the locking lever

    • D. 

      None of the above

  • 33. 
    Before you back under a truck trailer, make sure the :
    • A. 

      Air supply knob is in

    • B. 

      Air brakes are off

    • C. 

      Trailer brakes are locked

    • D. 

      All of the above

  • 34. 
    After you connect the air lines, but before you back under the trailer, you should
    • A. 

      Make sure the trailer brakes are off

    • B. 

      Walk around the rig to be sure it is clear

    • C. 

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

    • D. 

      All of the above

  • 35. 
    Why should you be sure that the fifth wheel plate is greased as required?
    • A. 

      To prevent steering problems

    • B. 

      To reduces heat and noise

    • C. 

      To ensure good electrical connection

    • D. 

      None of the above

  • 36. 
    After the trailer has been coupled tot he tractor, the tractor protection control valve should be placed in the ________ position
    • A. 

      Up

    • B. 

      Down

    • C. 

      Normal

    • D. 

      All of the above

  • 37. 
    After you have coupled the trailer, you should begin raising the landing gear by raising the ______ gear.
    • A. 

      Mid-level

    • B. 

      Low

    • C. 

      High

    • D. 

      Option 4

  • 38. 
    When backing a tractor under a trailer you should
    • A. 

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

    • B. 

      Always approach the trailer at a slight angle

    • C. 

      Always use the lowest reverse gear

    • D. 

      All of the above

  • 39. 
    Why should you lick the air line glad hands to each other (or dummy couplers) when you are not towing a trailer?
    • A. 

      It will keep water out of the lines

    • B. 

      If you do not, you could never build system pressure

    • C. 

      The connected brake circuit becomes a back up air tank

    • D. 

      All of the above

  • 40. 
    When you get ready to back under a semitrailer, you should line up
    • A. 

      The left rear outside dual wheel with the kingpin

    • B. 

      The kingpin with the edge of the drivers side locking jaw

    • C. 

      Directly in front of the trailer

    • D. 

      All of the above

  • 41. 
    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
    • A. 

      Applying/releasing the trailer brakes and listening for brake sounds

    • B. 

      Turning on the parking brakes from the cab

    • C. 

      Watching your mirrors to see if the trailer lights come on

    • D. 

      All of the above