Combination Vehicles

Question 1

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

Answer 1

= THE SHANK

Question 2

5. There are several types of vehicle skids, and they require somewhat different actions to respond to them, however there is one rule that is important for all skids?

Answer 2

= RESTORE TRACTION TO TIRES

Question 3

6. If you cannot complete a turn without entering another traffic lane, you should turn wide as you?

Answer 3

= COMPLETE THE TURN (after the intersection)

Question 4

13. Your emergency air line breaks or gets pulled apart while you are driving, the loss of pressure will cause the?

Answer 4

=Trailer Emergency/Spring Brakes to come on.

Question 5

19. When driving a ABS equipped tractor trailer combination you should?

Answer 5

= Brake normally.

Question 6

20. You have a major leak in the service line and you put on the brakes, service air pressure will escape and cause the?

Answer 6

= Trailer Emergency/Spring brakes to come on.

Question 7

21. If the service line disconnects while you are driving, what will happen right away?

Answer 7

Nothing likely to happen UNTIL you apply the brake pedal

Question 8

23. After you supply air to the trailer, make sure the airlines are not crossed and the trailer brakes are working, this is done by?

Answer 8

• Applying then Releasing the Trailer Brakes

- Listening for brake action sounds.

Question 9

25. How do you supply air to the air tank on the trailer, air is supplied by?

Answer 9

= Setting/Push-in the Trailer Air Supply/Parking Valve. (RED)

Question 10

27. The safety catch for the fifth wheel locking lever must be ________ for a coupling to be complete?

Answer 10

= Over the Locking Lever

Question 11

T/F?

A tractor bob-tailing (no trailer attached) takes longer to stop than a loaded combination vehicle.

Answer 11

TRUE

Question 12

T/F?

• Hand valve/Trolley Valve/Johnson Bar should only be used for testing the trailer’s service brakes.
• You should not try to use the hand valve during normal driving to try and prevent a jackknife.
• Never use the hand valve as a parking brake.

Answer 12

TRUE

Question 13

(COMBINATION TEST #2)

A device that allows the service brakes to be applied more quickly is?

Answer 13

= the Relay Valve.

Question 14

When coupling a tractor and trailer, and you have connected the airlines, before backing underneath the trailer, what should you do?

Answer 14

• Supply air to the Trailer Brake system (push red valve)
• WaitUntil the whole air system is at normal pressure = 100 - 125 PSI.
• Then set the Trailer Brakes. (pull-out red valve)
• Proceed to Couple

Question 15

After you have coupled the tractor to the trailer, you should always do which of the following?

Answer 15

• Check Trailer Brakes by doing a Tug Test.

- Make sure the jaws have locked around the Kingpin

Question 16

Another name for the trailer hand valve is?

Answer 16

= JOHNSON BAR, TROLLEY VALVE.

Question 17

The tractor protection valve is an in-cab valve that?

Answer 17

= Keeps air supplied to the Tractor brakes.

should the trailer break away, or start to leak

Question 18

You are bob tailing and have a major air leak in the service brake air-line and you apply the brakes, service air pressure will escape and cause the?

Answer 18

= The Tractor Emergency/Spring Brakes to come on when the pressure drops below 45 PSI.

Question 19

What are the 3 parts of the trailer kingpin?

Answer 19

the head
the shank
the base

Question 20

Many Trailers made before 1975 do not have?

Answer 20

spring brakes

Question 21

Trailers/Converter Dollies made after March 1st 1998 are required to have?

Answer 21

ABS

Question 22

If you cross the air-lines on an old trailer without spring brakes, you could pull the trailer but will not have?

Answer 22

trailer brakes