1. The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the ________ brake line.
Service.
Parking.
Emergency.
2. You have crashed with another vehicle. What you have to do first?
Use reverse gear to back up off the crash.
Turn on your four-way flashers.
Get out of your vehicle and away from the scene.
3. You are coupling a tractor to a semitrailer and have backed up but are not under it. What should you hook up before backing under?
The emergency and service air lines.
The electrical service cable.
Nothing. Back up and lock the fifth wheel.
4. Why should you lock the tractor glad hands to each other (or dummy couplers) when you are not towing a trailer?
The connected brake circuit becomes a back up air tank.
It will keep dirt and water out of the lines.
If you didn't, you could never build system pressure.
5. After you lock the kingpin into the fifth wheel, you should check the connection by:
Pulling forward 50 feet, turning right and then left.
Pulling the tractor ahead sharply the trailer brakes to release.
Pulling the tractor ahead gently with the trailer brakes locked.
6. When driving a set of doubles, it is necessary to close the ________ shut-off valve in the last trailer.
7. What gear should the tractor transmission be in after you have uncoupled the trailer and are inspecting the trailer supports?
Neutral.
Low reverse.
High reverse.
8. The safest way to make turn without entering another traffic lane is:
You should turn wide before you start the turn.
You should turn wide as you complete the turn.
You should not make a turn and move to another place where you can make a turn without crossing other lane.
9. You will know if the trailer ABS brakes are NOT working properly by:
Yellow ABS malfunction lamps on the left side of the trailer stays ON.
Yellow ABS malfunction lamps on the right side of the trailer stays ON.
Red malfunction lamps on the trailer brake cylinders stays ON.
10. Air and electrical lines from the tractor to the trailer should be:
Pulled tight, with very little slack.
Secured, but with enough slack for turns.
Resting on the frame of the tractor.
11. If your antilock braking system is not working on your trailer, you should:
Drive at a lower speed and get the system serviced soon.
Not drive until it is repaired.
Drive normally, but get the system serviced soon.
12. Which of these statements is true?
The brakes and suspension systems of combination vehicles work best with a light load.
Light vehicles need more braking power to stop than heavy ones.
"Bobtail" tractors can take longer to stop than a combination vehicle loaded to maximum gross weight.
13. After connecting the air lines but before backing under the trailer, you should:
Supply air to the trailer system, then pull out the air supply knob.
Make sure that the trailer brakes are off.
Walk around the rig to be sure that it is clear.
14. Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause the:
Air compressor air to unload instead of pumping.
Tractor's air to dump into the trailer tank through the service line.
Emergency trailer brakes to come on.
15. The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that:
The trailer will not swivel on the fifth wheel.
The parking lock is off and you may drive away.
The coupling is not right and should be fixed before driving the coupled unit.
16. In normal driving, some drivers use the hand valve before the brake pedal to prevent a jackknife. Which of these statements is true?
It should not be done.
It results in less skidding than using the brake pedal alone.
It is the best way to brake and keep the vehicle in a straight line.
17. Before you back under a trailer, make sure that:
The trailer brakes are locked.
The air brakes are off.
The air supply knob is in.
18. When should you use the hand valve to park a combination vehicle?
To park at loading docks.
To park on a grade.
Never.
19. You should not back a tractor under a trailer until the whole air system is:
Empty.
At normal pressure.
Between 60 and 80 psi.
20. Which part of the kingpin should the locking jaws close around?
The shank.
The head.
The base.
21. Off-tracking or "cheating" causes of which of these to follow the wider path while making a turn?
Triple towing a 45 feet trailer.
Tractor with two 27 feet trailers.
53-feet bobtail.
22. When you are allowed to get out of your vehicle while backing?
When you are unsure of your path of travel.
When your trailer begins to drift to passenger side.
You should never get out of your vehicle when backing.
23. The front trailer supports are up and the trailer is resting on the tractor. Make sure:
There is enough clearance between the top of the tractor tires and nose of the trailer.
There is enough clearance between the tractor frame and the landing gear.
Both a and b are correct.
24. Semitrailers made before 1975 that are equipped with the air brakes:
Usually need a glad hand converter.
Often do not have spring brakes.
Have only a service air line.
25. Why should you be sure that the fifth wheel plate is greased as required?
To ensure a good electrical connection.
To prevent steering problems.
To reduce heat and noise.
26. You supply air to the trailer tanks by:
Pushing in the trailer air supply valve.
Pulling out the trailer air supply valve.
Connecting the service line glad hands.
27. When do you need to use chocks to park a trailer?
Never.
Always.
Only when it will be parked on an incline.
28. After you have coupled the trailer you should have to raise the landing gear by:
Low gear
Intermediate
High gear
29. While driving behind other vehicle under good condition you should allow at least one second between your vehicle and the vehicle ahead for each ________ (how many) feet of your vehicle length?
30. A trailer is most likely to jackknife when it is _______.
loaded to full capacity.
over loaded.
empty.
31. There are two things that a driver can do to prevent a rollover. They are: (1) Keep the cargo as close to the ground as possible; and (2):
Make sure that the brakes are properly adjusted.
Keep both hands firmly on the steering wheel.
Go slow around turns.
32. Having antilock brakes on only your trailer:
Will give you more control over the vehicle when braking.
Will increase the likelihood of a rear wheel power until skid when braking.
Will increase the likelihood of jackknifing when braking.
33. The hand valve should be used:
only with a foot brake.
to test the trailer brakes.
as a parking brake.
34. After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. This is done by:
Turning on the parking brakes from the cab.
Watching your mirrors to see if the trailer lights come on.
Applying and releasing in the trailer brakes and listening for brake sounds.
35. Glad hands are used for connecting the:
Electric lines from the tract to the trailer.
Kingpin from the trailer to the locking jaws of the fifth wheel.
Service and emergency air lines from the vehicle to the trailer.
36. You are coupling tractor to a semitrailer. You have connected the airlines. Before backing under the trailer you should:
Supply air to the trailer system, then pull out the air supply knob.
Pull ahead to test the glad hands connections.
Make sure that the trailer brakes are off.
37. A tractor-trailer vehicle combination is most likely to roll over in turn when the configuration includes:
a 45 ft. and a 27 ft. trailer.
triple 27 ft. trailers.
double 45 ft. trailers.
38. A tractor with a(n) __________ trailer requires the shortest amount of stopping distance.
empty
lightly loaded
fully loaded
39. The front trailer supports are up and the trailer is resting on the tractor. Make sure:
There is enough clearance between the upper and lower fifth wheel.
The safety latch is in the unlocked position.
There is enough clearance between the tractor frame and the landing gear.
40. If the service air line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away?
The trailer's tank will exhaust through the open line.
The emergency trailer brakes will come on.
Nothing is likely to happen until you try to apply the brakes.
41. The air leakage rate for a combination vehicle (engine off, brakes off) should be less than ______ psi per minute.
42. How much space should be allowed between upper and lower fifth wheel after coupling?
About 1/4 inch.
Just enough to see light through it.
None.
43. Compared to a straight truck or bus, there are _________ things to inspect in combination vehicle.
fewer
the same number of
more
44. When connecting the glad hands, press the two seals of the couplers together at a _______ degree angle to one another.
45. Loss of air pressure in the emergency line causes:
The relay valves to close.
An increase in air pressure to the service brakes.
The trailer's emergency brakes to come on.
46. If you cannot make a turn without enteringanother traffic line, you should:
Turn wide as you complete your turn.
Not make that turn - go to another place where you won't have to cross into another line.
Turn wide before you start your turn.
47. How should you test the tractor-semitrailer connection for security?
Look at it carefully.
Rock the trailer back and forth with the trailer brakes locked.
Pull gently forward in low gear against the locked trailer brakes then look at it carefully.
48. Air brake equipped trailers made before 1975:
Often do not have spring brakes.
Usually need a glad hand converter.
Cannot be legally operated on interstate highways.
49. The earliest and best way to recognize that the trailer has started to skid is by:
Seeing it in your mirrors.
Feel for "pulling" in the cab.
Hear the wheels skidding.
50. What will happen if the air lines are crossed when you hook up to an old trailer?
The hand valve will apply the tractor brakes instead of the trailer brakes.
If the trailer has no spring brakes, you could drive away but you would not have trailer brakes.
The brake lights will not come on when you press the brake pedal.