Combination Vehicles Quiz Questions

10 Questions | Total Attempts: 283

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Questions and Answers
  • 1. 
    The fifth wheel should be checked to see if:
    • A. 

      It is properly greased.

    • B. 

      There are loose or missing pins in the slide mechanism of sliding 5th wheel.

    • C. 

      Make sure locking pins are fully engaged.

    • D. 

      All of the above.

  • 2. 
    The air leakage rate for a combination vehicle (engine off, brakes off) should be no more than _____ psi per minute.
    • A. 

      2

    • B. 

      3

    • C. 

      4

    • D. 

      5

  • 3. 
    Air lines on a commercial vehicle are usually color coded to keep them from getting mixed up. The emergency line is ______; the service line is ______.
    • A. 

      Red ; blue

    • B. 

      Blue ; red

    • C. 

      Orange ; green

    • D. 

      Green ; blue

  • 4. 
    Before backing under a trailer make sure that:
    • A. 

      That the landing gear is in the upright position.

    • B. 

      The trailer brakes are on.

    • C. 

      Your air brakes are off.

    • D. 

      The tractor protection valve is normal.

  • 5. 
    The air leakage rate for a combination vehicle (engine off; brakes on) should not be more than ____ psi per minute.
    • A. 

      2

    • B. 

      3

    • C. 

      4

    • D. 

      5

  • 6. 
    The easiest way to detect a trailer skid is by looking in your mirrors.
    • A. 

      True

    • B. 

      False

  • 7. 
    Semi trailers made before 1975 and equipped with air brakes:
    • A. 

      Often do not have spring brakes.

    • B. 

      Usually need a glad hand converter.

    • C. 

      Are illegal in all 50 states.

  • 8. 
    Which best describes the term 'off-tracking'?
    • A. 

      When the fifth wheel is not secured properly.

    • B. 

      Taking an unfamiliar route.

    • C. 

      The path of your steer wheels vs. the trailer wheels.

  • 9. 
    Hand valve should be used only in combination with the service pedal (foot brake).
    • A. 

      True

    • B. 

      False

  • 10. 
    What type of trailer is most likely to get stuck on railroad crossings?
    • A. 

      Possum-belly livestock trailers.

    • B. 

      Dry box van trailers.

    • C. 

      Reefer (refrigerated) trailers.