Combination Vehicle Test

31 Questions | Total Attempts: 1757

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Combination Quizzes & Trivia

COMBINATION VEHICLE TEST


Questions and Answers
  • 1. 
    TO PREVENT A ROLLOVER, KEEP THE CARGO AS CLOSE TO THE GROUND AS POSSIBLE, AND:
    • A. 

      KEEP BOTH HANDS ON THE STEERING WHEEL

    • B. 

      KEEP YOUR BRAKES ADJUSTED

    • C. 

      GO SLOW AROUND CURVES

    • D. 

      KEEP YOUR TIRES INFLATED PROPERLY

  • 2. 
    WHY ARE "BOBTAIL" TRACTORS HARDER TO STOP THAN SOME LOADED COMBINATION VEHICLES?
    • A. 

      THE TAIL OF THE VEHICLE IS SHORTER

    • B. 

      THE VEHICLE IS RELATIVELY LIGHT

    • C. 

      THERE ARE FEWER WHEELS TO STOP THE TRACTOR

    • D. 

      THERE ARE MORE BRAKE SYSTEMS ON A COMBINATION VEHICLE

  • 3. 
    TO STOP A JACKKNIFE OF A COMBINATION VEHICLE:
    • A. 

      USE THE TRAILER HAND BRAKE BEFORE THE BRAKE PEDAL

    • B. 

      DO NOT USE THE TRAILER HAND BRAKE

    • C. 

      TURN THE STEERING WHEEL IN THE OPPOSITE DIRECTION OF THE SKID

    • D. 

      NONE OF THE ABOVE

  • 4. 
    WHAT IS OFFTRACKING?
    • A. 

      WHEN THE REAR WHEELS FOLLOW A DIFFERENT PATH THAN THE FRONT WHEELS

    • B. 

      THE PROCESS OF TAKING THE TRACKS OFF A TRACTOR

    • C. 

      DRIVER FAILING TO KEEP ON ROUTE ON TRACK

    • D. 

      ERROR ON KEEPING TRACK OF HOURS AND MILES DRIVEN

  • 5. 
    WHEN SHOULD YOU USE THE TRAILER HAND VALVE?
    • A. 

      AS A PARKING BRAKE

    • B. 

      ONLY WHEN THE TRAILER IS FULLY LOADED

    • C. 

      TO TEST THE TRAILER BRAKES

    • D. 

      IN COMBINATION WITH THE FOOT BRAKE

  • 6. 
    WHAT IS THE PURPOSE OF THE TRACTOR PROTECTION VALVE?
    • A. 

      IT KEEPS AIR IN THE TRACTOR IF THE TRAILER BREAKS AWAY OR DEVELOPS A BAD LEAK

    • B. 

      IT PROTECTS THE TRACTOR FROM BRAKE DAMAGE

    • C. 

      IT IS A BACK-UP FOR THE TRAILER AIR SUPPLY CONTROL

    • D. 

      NONE OF THE ABOVE

  • 7. 
    WHEN WILL THE TRACTOR PROTECTION VALVE CLOSE AUTOMATICALLY?
    • A. 

      WHEN YOU PUSH IN THE TRAILER AIR SUPPLY CONTROL

    • B. 

      WHEN THE AIR PRESSURE IS LOW (20 TO 45 PSI)

    • C. 

      WHEN THE AIR PRESSURE IS TOO HIGH (80 TO 100 PSI)

    • D. 

      WHEN THE EMERGENCY BRAKES ARE TURNED ON

  • 8. 
    WHAT IS THE PURPOSE OF THE TRAILER AIR SUPPLY?
    • A. 

      TO SUPPLY CONTROL TO THE AIR SUPPLY

    • B. 

      TO CONTROL AIR SUPPLY TO THE PROTECTION VALVE

    • C. 

      TO SUPPLY THE TRAILER WITH AIR

    • D. 

      TO SUPPLY AIR TO THE TRACTOR CONTROL

  • 9. 
    WHAT IS THE PURPOSE OF THE SERVICE AIR LINE?
    • A. 

      TO SERVICE THE TRACTOR AIR BRAKES

    • B. 

      TO SERVICE THE AIR CONTROL SUPPLY

    • C. 

      TO CARRY AIR TO THE TRACTOR BRAKES

    • D. 

      TO CARRY AIR TO THE TRAILER BRAKES

  • 10. 
    WHAT IS THE PURPOSE OF THE EMERGENCY AIR LINE?
    • A. 

      TO SUPPLY AIR TO THE TRAILER AIR TANKS

    • B. 

      TO CONTROL THE EMERGENCY BRAKE ON COMBINATION VEHICLES

    • C. 

      BOTH OF THE ABOVE

    • D. 

      NEITHER OF THE ABOVE

  • 11. 
    WHAT IS THE USUAL COLOR FOR THE EMERGENCY LINE COUPLERS?
    • A. 

      RED

    • B. 

      WHITE

    • C. 

      BLUE

    • D. 

      GREEN

  • 12. 
    WHY SHOULD YOU LOCK THE AIR HOSE COUPLERS TO EACH OTHER WHEN NOT IN USE?
    • A. 

      TO KEEP THE AIR SUPPLY CONSTANT

    • B. 

      TO KEEP DIRT AND WATER OUT OF THE LINE

    • C. 

      TO KEEP THE RUBBER SEALS SUPPLE

    • D. 

      ALL OF THE ABOVE

  • 13. 
    ON AN OLD TRAILER WITHOUT SPRING BRAKES, WHAT HAPPENS WHEN YOU CROSS THE AIR LINE?
    • A. 

      THE BRAKE PEDAL WILL NOT WORK

    • B. 

      YOU COULD DRIVE AWAY, BUT HAVE NO TRAILER BRAKES

    • C. 

      THE HAND VALVE WILL CAUSE THE TRAILER BRAKES TO COME ON WHEN YOU USE THE AIR BRAKES

    • D. 

      THE EMERGENCY BRAKES WILL COME ON

  • 14. 
    MOST TRAILERS BUILT BEFORE 1975 HAVE NO PARKING BRAKES BECAUSE:
    • A. 

      THEY DON'T HAVE AIR BRAKES

    • B. 

      THEY DON'T HAVE SPRING BRAKES

    • C. 

      THEY USE THE SERVICE BRAKE FOR A PARKING BRAKE

    • D. 

      SHUT-OFF VALVES WERE NOT AVAILABLE YET

  • 15. 
    WHAT HAPPENS IMMEDIATELY IF THE SERVICE AIR LINE COMES APART WHILE DRIVING, BUT THE EMERGENCY LINE IS OKAY?
    • A. 

      NOTHING IS LIKELY TO HAPPEN UNTIL YOU PRESS THE BRAKES

    • B. 

      THE EMERGENCY TRAILER BRAKES WILL COME ON IMMEDIATELY

    • C. 

      THE SAME THING AS WHEN THERE'S A LEAK IN THE EMERGENCY LINE

    • D. 

      THE EMERGENCY TRACTOR BRAKE WILL COME ON

  • 16. 
    WHY SHOULD THE FIFTH WHEEL BE COMPLETELY GREASED?
    • A. 

      TO MAKE IS EASY TO COUPLE

    • B. 

      TO MAKE IT EASY TO UNCOUPLE

    • C. 

      TO PREVENT STEERING PROBLEMS

    • D. 

      TO PREVENT RUST AND CORROSION

  • 17. 
    IN COUPLING, WHEN IS THE TRAILER AT THE RIGHT HEIGHT?
    • A. 

      IN FRON OF THE KINGPIN

    • B. 

      SLIGHTLY OFF LINE WITH THE TRACTOR

    • C. 

      DIRECTLY IN FRONT OF THE TRAILER

    • D. 

      AT MORE THAN A 5 DEGREE ANGLE WITH THE TRAILER

  • 18. 
    IN COUPLING, WHEN IS THE TRAILER AT THE RIGHT HEIGHT?
    • A. 

      THE END OF THE KINGPIN IS EVEN WITH THE TOP OF THE FIFTH WHEEL

    • B. 

      THE KINGPIN IS AN INCH ABOVE THE FIFTH WHEEL

    • C. 

      WHEN THE TRAILER LANDING GEAR IS FULLY EXTENDED

    • D. 

      WHEN THE TRAILER WILL BE LIFTED SLIGHTLY WHEN THE TRACTOR CONNECTS

  • 19. 
    IN COUPLING, JUST BEFORE THE TRACTOR IS COUPLED WITH THE TRAILER YOU SHOULD:
    • A. 

      PUSH IN THE TRACTOR PROTECTION VALVE

    • B. 

      CHOCK THE TRAILER WHEELS

    • C. 

      CONNECT THE EMERGENCY AND SERVICE AIRLINES

    • D. 

      GREASE THE FIFTH WHEEL

  • 20. 
    IN COUPLING, JUST BEFORE THE TRACTOR IS COUPLED WITH THE TRAILER YOU SHOULD:
    • A. 

      FLUSH ALL MOISTURE FROM THE SYSTEM

    • B. 

      WAIT UNTIL THE AIR PRESSURE IS NORMAL

    • C. 

      THE TRACTOR PROTECTION VALVE

    • D. 

      REMOVE THE CHOCKS FROM THE TRACTOR WHEELS

  • 21. 
    IN COUPLING, HOW CAN YOU MAKE SURE THE AIR LINES ARE NOT CROSSED?
    • A. 

      THE TRACTOR WILL MOVE EASILY FORWARD AND BACK

    • B. 

      PUMP THE BRAKE AND YOU WILL HEAR THE BRAKES MOVE AND AIR ESCAPE

    • C. 

      THE TRACTOR PROTECTION VALVE WILL POP OUT

    • D. 

      ALL OF THE ABOVE ARE WAYS TO BE SURE THE LINES AREN'T CROSSED

  • 22. 
    IN COUPLING, BEFORE YOU BACK UNDER THE TRAILER, HOW DO YOU LICK THE TRAILER BRAKES?
    • A. 

      PUSH AIR SUPPLY KNOB IN

    • B. 

      RELEASE THE AIR BRAKES

    • C. 

      PULL OUT THE AIR SUPPLY KNOB

    • D. 

      PUT THE TRACTOR PROTECTION VALVE IN "NORMAL" POSITION

  • 23. 
    HOW DO YOU CHECK THE SECURITY OF THE KINGPIN AND THE FIFTH WHEEL CONNECTION?
    • A. 

      BACK UP 10 TO 20 YARDS

    • B. 

      PULL FORWARD SHARPLY AND RELEASE THE TRAILER BRAKE

    • C. 

      PULL FORWARD SLOWLY, TURNING LEFT AND RIGHT

    • D. 

      PULL AHEAD GENTLY WITH THE TRAILER BRAKES LOCKED

  • 24. 
    WHEN YOU INSPECT THE COUPLING, HOW MUCH SPACE SHOULD THERE BE BETWEEN UPPER AND LOWER FIFTH WHEEL?
    • A. 

      YOU SHOULD BE ABLE TO SEE THE LIGHT THROUGH THE OPENING

    • B. 

      ABOUT ONE-HALF INCH

    • C. 

      ABOUT ONE-FOURTH INCH

    • D. 

      THERE SHOULD BE NO SPACE

  • 25. 
    WHICH PART OF THE KINGPIN SHOULD THE LOCKING JAWS OF THE FIFTH WHEEL CLOSE AROUND?
    • A. 

      THE SHANK

    • B. 

      THE BASE

    • C. 

      THE HEAD

    • D. 

      THE FLANGE

  • 26. 
    FOR THE COUPLING TO BE COMPLETE, THE SAFETY CATCH FOR THE FIFTH WHEEL LOCKING LEVER MUST BE:
    • A. 

      UNDER THE LOCKING GEAR

    • B. 

      OVER THE LOCKING GEAR

    • C. 

      BEHIND THE LOCKING GEAR

    • D. 

      STRAIGHT UP

  • 27. 
    WHAT DO YOU DO IF THE FIFTH WHEEL LOCKING LEVER IS ALMOST IN THE LOCK POSITION, BUT WON'T LOCK?
    • A. 

      DON'T WORRY; YOU CAN DRIVE BECAUSE THE LOCKING LEVER IS FOR EMERGENCY ONLY

    • B. 

      DON'T DRIVE, AND HAVE IT REPAIRED

    • C. 

      KEEP TRYING

    • D. 

      DRIVE, BUT DON'T JERK OR TURN SHARPLY

  • 28. 
    AFTER YOU HAVE COUPLED, WHAT DO YOU DO WITH THE FRONT TRAILER SUPPORTS?
    • A. 

      RAISE THEM TO THE DRIVE POSITION

    • B. 

      TAKE THEM OFF AND STORE THEM

    • C. 

      TAKE THEM OFF AND SECURE TO THE TRAILER

    • D. 

      YOU RAISE THEM FULLY AND SECURE THE CRANK HANDLE

  • 29. 
    WHEN THE FRONT TRAILER SUPPORTS ARE UP AND THE TRAILER  IS RESTING ON THE TRACTORM THERE SHOULD BE CLEARANCE:
    • A. 

      BETWEEN THE TRACTOR FRAME AND LANDING GEAR

    • B. 

      BETWEEN THE TOPS OF THE TIRES AND THE NOSE OF THE TRAILER

    • C. 

      BOTH A AND B ARE CORRECT

    • D. 

      NEITHER A OR B ARE CORRECT

  • 30. 
    WHAT IS THE AIR LEAKAGE RATE FOR A COMBINATION VEHICLE WITH THE ENGINE AND BRAKES OFF?
    • A. 

      LESS THAN 1 PSI PER MINUTE

    • B. 

      LESS THAN 2 PSI PER MINUTE

    • C. 

      LESS THAN 3 PSI PER MINUTE

    • D. 

      LESS THAN 4 PSI PER MINUTE

  • 31. 
    WHAT IS THE MAXIMUM AIR LEAKAGE RATE FOR A COMBINATION VEHICLE WITH THE ENGINE OFF AND THE BRAKES ON?
    • A. 

      1 PSI PER MINUTE

    • B. 

      2 PSI PER MINUTE

    • C. 

      3 PSI PER MINUTE

    • D. 

      4 PSI PER MINUTE