Combination Vehicle Test

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    WHAT IS THE USUAL COLOR FOR THE EMERGENCY LINE COUPLERS?

    • RED
    • WHITE
    • BLUE
    • GREEN
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About This Quiz

COMBINATION VEHICLE TEST

Combination Quizzes & Trivia

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  • 2. 

    TO PREVENT A ROLLOVER, KEEP THE CARGO AS CLOSE TO THE GROUND AS POSSIBLE, AND:

    • KEEP BOTH HANDS ON THE STEERING WHEEL

    • KEEP YOUR BRAKES ADJUSTED

    • GO SLOW AROUND CURVES

    • KEEP YOUR TIRES INFLATED PROPERLY

    Correct Answer
    A. GO SLOW AROUND CURVES
  • 3. 

    WHAT IS OFFTRACKING?

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

    • THE PROCESS OF TAKING THE TRACKS OFF A TRACTOR

    • DRIVER FAILING TO KEEP ON ROUTE ON TRACK

    • ERROR ON KEEPING TRACK OF HOURS AND MILES DRIVEN

    Correct Answer
    A. WHEN THE REAR WHEELS FOLLOW A DIFFERENT PATH THAN THE FRONT WHEELS
  • 4. 

    WHICH PART OF THE KINGPIN SHOULD THE LOCKING JAWS OF THE FIFTH WHEEL CLOSE AROUND?

    • THE SHANK

    • THE BASE

    • THE HEAD

    • THE FLANGE

    Correct Answer
    A. THE SHANK
  • 5. 

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

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

    • DON'T DRIVE, AND HAVE IT REPAIRED

    • KEEP TRYING

    • DRIVE, BUT DON'T JERK OR TURN SHARPLY

    Correct Answer
    A. DON'T DRIVE, AND HAVE IT REPAIRED
  • 6. 

    WHEN SHOULD YOU USE THE TRAILER HAND VALVE?

    • AS A PARKING BRAKE

    • ONLY WHEN THE TRAILER IS FULLY LOADED

    • TO TEST THE TRAILER BRAKES

    • IN COMBINATION WITH THE FOOT BRAKE

    Correct Answer
    A. TO TEST THE TRAILER BRAKES
  • 7. 

    IN COUPLING, JUST BEFORE THE TRACTOR IS COUPLED WITH THE TRAILER YOU SHOULD:

    • FLUSH ALL MOISTURE FROM THE SYSTEM

    • WAIT UNTIL THE AIR PRESSURE IS NORMAL

    • THE TRACTOR PROTECTION VALVE

    • REMOVE THE CHOCKS FROM THE TRACTOR WHEELS

    Correct Answer
    A. WAIT UNTIL THE AIR PRESSURE IS NORMAL
  • 8. 

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

    • TO KEEP THE AIR SUPPLY CONSTANT

    • TO KEEP DIRT AND WATER OUT OF THE LINE

    • TO KEEP THE RUBBER SEALS SUPPLE

    • ALL OF THE ABOVE

    Correct Answer
    A. TO KEEP DIRT AND WATER OUT OF THE LINE
  • 9. 

    WHEN WILL THE TRACTOR PROTECTION VALVE CLOSE AUTOMATICALLY?

    • WHEN YOU PUSH IN THE TRAILER AIR SUPPLY CONTROL

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

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

    • WHEN THE EMERGENCY BRAKES ARE TURNED ON

    Correct Answer
    A. WHEN THE AIR PRESSURE IS LOW (20 TO 45 PSI)
  • 10. 

    WHY SHOULD THE FIFTH WHEEL BE COMPLETELY GREASED?

    • TO MAKE IS EASY TO COUPLE

    • TO MAKE IT EASY TO UNCOUPLE

    • TO PREVENT STEERING PROBLEMS

    • TO PREVENT RUST AND CORROSION

    Correct Answer
    A. TO PREVENT STEERING PROBLEMS
  • 11. 

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

    • YOU SHOULD BE ABLE TO SEE THE LIGHT THROUGH THE OPENING

    • ABOUT ONE-HALF INCH

    • ABOUT ONE-FOURTH INCH

    • THERE SHOULD BE NO SPACE

    Correct Answer
    A. THERE SHOULD BE NO SPACE
  • 12. 

    MOST TRAILERS BUILT BEFORE 1975 HAVE NO PARKING BRAKES BECAUSE:

    • THEY DON'T HAVE AIR BRAKES

    • THEY DON'T HAVE SPRING BRAKES

    • THEY USE THE SERVICE BRAKE FOR A PARKING BRAKE

    • SHUT-OFF VALVES WERE NOT AVAILABLE YET

    Correct Answer
    A. THEY DON'T HAVE SPRING BRAKES
  • 13. 

    HOW DO YOU CHECK THE SECURITY OF THE KINGPIN AND THE FIFTH WHEEL CONNECTION?

    • BACK UP 10 TO 20 YARDS

    • PULL FORWARD SHARPLY AND RELEASE THE TRAILER BRAKE

    • PULL FORWARD SLOWLY, TURNING LEFT AND RIGHT

    • PULL AHEAD GENTLY WITH THE TRAILER BRAKES LOCKED

    Correct Answer
    A. PULL AHEAD GENTLY WITH THE TRAILER BRAKES LOCKED
  • 14. 

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

    • THE BRAKE PEDAL WILL NOT WORK

    • YOU COULD DRIVE AWAY, BUT HAVE NO TRAILER BRAKES

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

    • THE EMERGENCY BRAKES WILL COME ON

    Correct Answer
    A. YOU COULD DRIVE AWAY, BUT HAVE NO TRAILER BRAKES
  • 15. 

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

    • NOTHING IS LIKELY TO HAPPEN UNTIL YOU PRESS THE BRAKES

    • THE EMERGENCY TRAILER BRAKES WILL COME ON IMMEDIATELY

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

    • THE EMERGENCY TRACTOR BRAKE WILL COME ON

    Correct Answer
    A. NOTHING IS LIKELY TO HAPPEN UNTIL YOU PRESS THE BRAKES
  • 16. 

    AFTER YOU HAVE COUPLED, WHAT DO YOU DO WITH THE FRONT TRAILER SUPPORTS?

    • RAISE THEM TO THE DRIVE POSITION

    • TAKE THEM OFF AND STORE THEM

    • TAKE THEM OFF AND SECURE TO THE TRAILER

    • YOU RAISE THEM FULLY AND SECURE THE CRANK HANDLE

    Correct Answer
    A. YOU RAISE THEM FULLY AND SECURE THE CRANK HANDLE
  • 17. 

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

    • 1 PSI PER MINUTE

    • 2 PSI PER MINUTE

    • 3 PSI PER MINUTE

    • 4 PSI PER MINUTE

    Correct Answer
    A. 4 PSI PER MINUTE
  • 18. 

    WHY ARE "BOBTAIL" TRACTORS HARDER TO STOP THAN SOME LOADED COMBINATION VEHICLES?

    • THE TAIL OF THE VEHICLE IS SHORTER

    • THE VEHICLE IS RELATIVELY LIGHT

    • THERE ARE FEWER WHEELS TO STOP THE TRACTOR

    • THERE ARE MORE BRAKE SYSTEMS ON A COMBINATION VEHICLE

    Correct Answer
    A. THE VEHICLE IS RELATIVELY LIGHT
  • 19. 

    WHAT IS THE PURPOSE OF THE TRACTOR PROTECTION VALVE?

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

    • IT PROTECTS THE TRACTOR FROM BRAKE DAMAGE

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

    • NONE OF THE ABOVE

    Correct Answer
    A. IT KEEPS AIR IN THE TRACTOR IF THE TRAILER BREAKS AWAY OR DEVELOPS A BAD LEAK
  • 20. 

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

    • BETWEEN THE TRACTOR FRAME AND LANDING GEAR

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

    • BOTH A AND B ARE CORRECT

    • NEITHER A OR B ARE CORRECT

    Correct Answer
    A. BOTH A AND B ARE CORRECT
  • 21. 

    IN COUPLING, WHEN IS THE TRAILER AT THE RIGHT HEIGHT?

    • IN FRON OF THE KINGPIN

    • SLIGHTLY OFF LINE WITH THE TRACTOR

    • DIRECTLY IN FRONT OF THE TRAILER

    • AT MORE THAN A 5 DEGREE ANGLE WITH THE TRAILER

    Correct Answer
    A. DIRECTLY IN FRONT OF THE TRAILER
  • 22. 

    IN COUPLING, WHEN IS THE TRAILER AT THE RIGHT HEIGHT?

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

    • THE KINGPIN IS AN INCH ABOVE THE FIFTH WHEEL

    • WHEN THE TRAILER LANDING GEAR IS FULLY EXTENDED

    • WHEN THE TRAILER WILL BE LIFTED SLIGHTLY WHEN THE TRACTOR CONNECTS

    Correct Answer
    A. WHEN THE TRAILER WILL BE LIFTED SLIGHTLY WHEN THE TRACTOR CONNECTS
  • 23. 

    WHAT IS THE PURPOSE OF THE EMERGENCY AIR LINE?

    • TO SUPPLY AIR TO THE TRAILER AIR TANKS

    • TO CONTROL THE EMERGENCY BRAKE ON COMBINATION VEHICLES

    • BOTH OF THE ABOVE

    • NEITHER OF THE ABOVE

    Correct Answer
    A. BOTH OF THE ABOVE
  • 24. 

    WHAT IS THE PURPOSE OF THE TRAILER AIR SUPPLY?

    • TO SUPPLY CONTROL TO THE AIR SUPPLY

    • TO CONTROL AIR SUPPLY TO THE PROTECTION VALVE

    • TO SUPPLY THE TRAILER WITH AIR

    • TO SUPPLY AIR TO THE TRACTOR CONTROL

    Correct Answer
    A. TO SUPPLY THE TRAILER WITH AIR
  • 25. 

    IN COUPLING, JUST BEFORE THE TRACTOR IS COUPLED WITH THE TRAILER YOU SHOULD:

    • PUSH IN THE TRACTOR PROTECTION VALVE

    • CHOCK THE TRAILER WHEELS

    • CONNECT THE EMERGENCY AND SERVICE AIRLINES

    • GREASE THE FIFTH WHEEL

    Correct Answer
    A. CONNECT THE EMERGENCY AND SERVICE AIRLINES
  • 26. 

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

    • LESS THAN 1 PSI PER MINUTE

    • LESS THAN 2 PSI PER MINUTE

    • LESS THAN 3 PSI PER MINUTE

    • LESS THAN 4 PSI PER MINUTE

    Correct Answer
    A. LESS THAN 3 PSI PER MINUTE
  • 27. 

    IN COUPLING, HOW CAN YOU MAKE SURE THE AIR LINES ARE NOT CROSSED?

    • THE TRACTOR WILL MOVE EASILY FORWARD AND BACK

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

    • THE TRACTOR PROTECTION VALVE WILL POP OUT

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

    Correct Answer
    A. PUMP THE BRAKE AND YOU WILL HEAR THE BRAKES MOVE AND AIR ESCAPE
  • 28. 

    FOR THE COUPLING TO BE COMPLETE, THE SAFETY CATCH FOR THE FIFTH WHEEL LOCKING LEVER MUST BE:

    • UNDER THE LOCKING GEAR

    • OVER THE LOCKING GEAR

    • BEHIND THE LOCKING GEAR

    • STRAIGHT UP

    Correct Answer
    A. OVER THE LOCKING GEAR
  • 29. 

    TO STOP A JACKKNIFE OF A COMBINATION VEHICLE:

    • USE THE TRAILER HAND BRAKE BEFORE THE BRAKE PEDAL

    • DO NOT USE THE TRAILER HAND BRAKE

    • TURN THE STEERING WHEEL IN THE OPPOSITE DIRECTION OF THE SKID

    • NONE OF THE ABOVE

    Correct Answer
    A. DO NOT USE THE TRAILER HAND BRAKE
  • 30. 

    WHAT IS THE PURPOSE OF THE SERVICE AIR LINE?

    • TO SERVICE THE TRACTOR AIR BRAKES

    • TO SERVICE THE AIR CONTROL SUPPLY

    • TO CARRY AIR TO THE TRACTOR BRAKES

    • TO CARRY AIR TO THE TRAILER BRAKES

    Correct Answer
    A. TO CARRY AIR TO THE TRAILER BRAKES
  • 31. 

    IN COUPLING, BEFORE YOU BACK UNDER THE TRAILER, HOW DO YOU LICK THE TRAILER BRAKES?

    • PUSH AIR SUPPLY KNOB IN

    • RELEASE THE AIR BRAKES

    • PULL OUT THE AIR SUPPLY KNOB

    • PUT THE TRACTOR PROTECTION VALVE IN "NORMAL" POSITION

    Correct Answer
    A. PULL OUT THE AIR SUPPLY KNOB

Quiz Review Timeline (Updated): Mar 16, 2022 +

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

  • Current Version
  • Mar 16, 2022
    Quiz Edited by
    ProProfs Editorial Team
  • Sep 30, 2009
    Quiz Created by
    Susie04
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