Combination

1. Which part of the kingpin should the locking jaws close around?

The base

The shank

The head

All of the above

2. When you get ready to back under a semitrailer, you should line up

The left rear outside dual wheel with the kingpin

The kingpin with the edge of the drivers side locking jaw

Directly in front of the trailer

All of the above

3. After the trailer has been coupled tot he tractor, the tractor protection control valve should be placed in the ________ position

Up

Down

Normal

All of the above

4. After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. You do this by

Applying/releasing the trailer brakes and listening for brake sounds

Turning on the parking brakes from the cab

Watching your mirrors to see if the trailer lights come on

All of the above

5. The fifth wheel locking lever is not locked after the jaws close around the kingpin. this means that

The parking lock is off and may drive away

The trailer will not swivel on the fifth wheel

The coupling is not right and should be fixed before driving the coupled unit

All of the above

6. In general, the higher your truck's "center of gravity" the

Easier it is to turn over

Easier it is to turn around corners

More stable it is when turning

All of the above

7. Under good driving conditions, you should leave at least one second of space between your vehicle and the vehicle ahead for every __________ feet of your vehicles length

30

20

10

All of the above

8. Why should you be sure that the fifth wheel plate is greased as required?

To prevent steering problems

To reduces heat and noise

To ensure good electrical connection

None of the above

9. When backing a tractor under a trailer you should

Do it quickly to ensure that the kingpin is locked into the fifth wheel

Always approach the trailer at a slight angle

Always use the lowest reverse gear

All of the above

10. There are two things that can prevent a rollover. They are: (1) keep the cargo as close to the ground as possible; and (2)

Keep both hands firmly on the steering wheel

Go slow around turns

Make sure the brakes are properly adjusted

None of the above

11. You should not back a tractor under a trailer until the whole air system is

At normal pressure

Empty

Between 60 and 80 psi

All of the above

12. Compared to a straight truck or bus, there are _____ things to inspect on a combination vehicle

More

Fewer

The same number of

All of the above

13. You are coupling a tractor to a semitrailer. You have backed up but are not under it. what should you hook up before backing under the semitrailer?

Nothing, back up and lock the fifth wheel

The electrical service cable

The emergency and service air lines

All of the above

14. To unlock the fifth wheel, pull the release handle to the _______ position

Closed

Neutral

Open

All of the above

15. After you have coupled the trailer, you should begin raising the landing gear by raising the ______ gear.

Mid-level

Low

High

Option 4

16. Why should you lick the air line glad hands to each other (or dummy couplers) when you are not towing a trailer?

It will keep water out of the lines

If you do not, you could never build system pressure

The connected brake circuit becomes a back up air tank

All of the above

17. After you lock the kingpin into the fifth wheel, you should check the connection by pulling

The tractor ahead gently with the trailer brakes locked

Forward 50 feet, turning right, and left

The tractor ahead sharply to release the trailer brakes

None of the above

18. The best way to tell if your trailer has tarted to skid is to:

Feel for "pulling" in the cab

Hear the wheels skidding

See it in your mirrors

None of the above

19. After you connect the air lines, but before you back under the trailer, you should

Make sure the trailer brakes are off

Walk around the rig to be sure it is clear

Supply air to the trailer system, then pull out the air supply knob

All of the above

20. You want to inspect the trailer supports. You should place the tractor transmission in which gear after you have uncoupled the trailer?

Low revers

High reverse

Neutral

All of the above

21. A trailer is most likely to jackknife when it is

Empty

Over loaded

Loaded to full capacity

All of the above

22. Air and electric lines from the tractor to the trailer should be

Secured, but with enough slack for turns

Resting on the frame of the tractor

Pulled tight, with very little slack

All of the above

23. When should you use chocks to park a trailer not equipped with spiring brakes?

Only when it will be parked on an incline

Never

Always

All of the above

24. If you have coupled with a semitrailer, where should the front trailer supports be before driving away?

Raised 3/4 way with the crank handle removed

Raised 1/2 way with the crank handle secured in its bracket

Fully raised with the crank handle secured in its bracket

None of the above

25. You have pushed in the trailer supply valve. You should not move the tractor until the whole air system is:

At normal pressure

Between 60 and 80 psi

Empty

All of the above

26. Which of these vehicles off-track the most

5-axle tractor towing a 42-foot trailer

5-axle tractor towing a 45-foot trailer

5-axle tractor towing a 52-foot trailer

None of the above

27. Before you back under a truck trailer, make sure the :

Air supply knob is in

Air brakes are off

Trailer brakes are locked

All of the above

28. A tractor with a (n) ______ trailer requires the shortest stopping distance

Lightly loaded

Fully loaded

Empty

None of the above

29. How much space should be between the upper and lower fifth wheel after coupling

Just enough to see light through it

None

About 1/4 inch

All of the above

30. You are coupling a semitrailer to your tractor but have not backed under it. the trailer is at the right height when

The kingpin is about 1 1/4 inches above the fifth wheel

It is raised slightly when the tractor is backed under it

The end of the kingpin is even with the top of the fifth wheel

All of the above

31. If you cannot make a turn without entering another traffic lane, you should

Not make that turn

Turn wide before you start your turn

Turn wide as you complete your turn

All of the above

32. When you are uncoupling a loaded trailer, lower the landing gear until it

Makes contact with the ground and lifts the trailer off of the fifth wheel

Makes firm contact with the ground

Just reaches the ground

All of the above

33. Which statement is true

Light vehicles need more braking power to stop than heavy ones

"bobtail" tractors can take longer to stop than a combination vehicle loaded

The brake and suspension systems of combination vehicles work best with a light load

None of the above

34. To stop a trailer skid you should

Counter steer

Use the trailer hand brake

Release the brake

All of the above

35. For a coupling to be completed, the safety catch for the fifth wheel locking lever must be

Straight up

Over the locking lever

Through the locking lever

None of the above

36. Glad hands are used to connect the

Kingpin from the tractor to the locking jaws on the glide plate

Electric lines from the truck to the trailer

Service and emergency air lines from the truck to the trailer

All of the above

37. When coupling, the proper position of the fifth wheel is

Tilted down towards the end of the tractor

Level with the ground

Tilted up towards the end of the tractor

All of the above

38. The front trailer supports are up and the trailer is resting on the tractor. Make sure

There is enough clearance between the tractor frame and the landing gear

There is enough clearance between the upper and lower fifth wheel

The safety latch is in the unlocked position

All of the above

39. You are uncoupling a trailer. After you shut off the trailer air supply and lock the trailer brakes, you should

Immediately put on your tractor parking brakes

Back up gently to ease pressure on the fifth wheel locking jaws

Begin to lower the trailer landing gear

All of the above

40. When checking the trailers emergency brakes, the tractor protection control valve should be placed in the _______ position

Emergency

Neutral

Normal

All of the above

41. When checking that the trailer is securely coupled to the tractor, the landing gear should be

Full lowered

Fully raised

Slightly raised

All of the above