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CDL PERMIT > Combination Vehicle > Flashcards

Combination Vehicle Flashcards

1
Q

Bob tailing means:

A

No trailer attached

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2
Q

The ONLY time you should use the hand valve (brake) is to

A

Test E- brakes

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3
Q

Glad hands are hooked together or to dummy couplers to…

A

Avoid water & dirt out of airlines

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4
Q

ABS is an addition to your normal breaks. There purpose is to help…

A

Avoid wheel lock up

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5
Q

If you cross air lines on old trailer W/O SPRING BRAKES. You WILL NOT have use of trailer brakes TRUE or FALSE?

A

True

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6
Q

If Damage or breakage to Emergency or service air lines occurs. What will happen?

A
  • Tractor Protection Valve will close

- Trailer brakes will engage

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7
Q

5th wheel must be greased to prevent …

A

Steering issues

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8
Q

The trailer brakes MUST ALWAYS be _______ & ______ before backing under it to couple.

A

Chocked & locked

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9
Q

When coupling & un-coupling ALWAYS use these for safety!

A

Chock blocks

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10
Q

You know the trailer is at the correct height when backing under it because .

A

It’s raised slightly to relieve pressure off landing gear

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11
Q

Before backing under the trailer.l you must set the ______ brakes

A

TRAILER brakes.

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12
Q

Gently pull on the kingpin when the ____brakes are locked

A

Trailer

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13
Q

Trailer brakes must be connected BEFORE or AFTER backing under the trailer?

A

Before

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14
Q

If pulling more than 1 trailer ALL AIR VALVES are OPEN…. EXCEPT which trailer

A

Last trailer. Crack this valve to test air system.

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15
Q

Always check the kingpin visually true or false.

A

True

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16
Q

Tractor bob-tail takes longer to stop than a loaded combination vehicle T or F..

A

True

17
Q

5th wheel locking jaws or safety latch must be over the locking lever. True or false

A

True

18
Q

Trailer support OR dollies should always be raised FULLY & _____ should be secured before moving.

A

Crank handle

19
Q

There must be adequate clearance between the _____ & the ______.

A

Tractor tired & nose of trailer

20
Q

3 parts of the kingpin:

A

Head
Shank
Base

21
Q

Which part of the kingpin should the locking jaws go around

A

Shank

22
Q

One rule is important with all skids

A

restore traction

23
Q

If the emergency air line breaks while driving the loss of pressure will cause this action.

A

Emergency brakes trailer brakes to come on

24
Q

If lines are crossed the trailer brakes would ..

A

Not work!

25
Q

Trailers made before 75’ don’t have these kind of brakes

A

Spring brakes

26
Q

As you slow down you should

  1. Monitor your tractor & trailer
  2. Back off the brakes
    True or false
A

True

27
Q

If you have a major leak in the SERVICE AIR LINE & put on the brakes the EMERGENCY brakes, will engage TREU or FALSE ?

A

TRUE

28
Q

After you supply air to the trailer you that the lines are Not crossed by:

A

Also lying & releasing trailer brakes & listening for Audible leaks.

29
Q

You supply air to the air tank on the TRAILER by?

A

Pushing the RED trailer supply valve (TSV)

30
Q

Safety catch for the 5th wheel locking lever MUST BE over the locking lever

A

True or False

31
Q

Relay valve allows the device brake to be applied more quickly TRUE OR FALSE

A

True

32
Q

When trailer support (landing gear) is up & trailer is resting on the tractor make sure:

A
  1. There’s enough clearance between tractor tired & nose of the trailer.
  2. Tractor frame & the landing gear.
33
Q

You pushed the trailer air supply valve. DO NOT move the tractor until the psi is at____

A

100-125 psi

34
Q

TRACTOR PROTECTION VALVE is an in can valve that keeps air supply to the tractor should the TRAILER brake away or leak. TRUE or FALSE

A

True

35
Q

What kind of trailer is most likely to hang up on railroads.

A

Low-boy trailer

36
Q

Yellow test light in the cab indicates:

A

Trailer has ABS

CDL PERMIT (3 decks)

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