Combination Vehicle Test

1. WHAT IS THE USUAL COLOR FOR THE EMERGENCY LINE COUPLERS?

RED

WHITE

BLUE

GREEN

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

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

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

THE SHANK

THE BASE

THE HEAD

THE FLANGE

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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