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CDL > Combination > Flashcards

Combination Flashcards

1
Q

Which statement is true?

A

“Bobtail” tractors can take longer to stop than a combination vehicle loaded to maximum gross weight

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2
Q

After you connected the air lines, but before you back under the trailer, you should:

A

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

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3
Q

Under good driving conditions, you should leave at least one second of space between you vehicle and the vehicle ahead for every ___ feet of vehicle’s length

A

10 ft

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4
Q

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?

A

The emergency and service air lines

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5
Q

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

A

The Shank

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6
Q

To stop a trailer skid you should:

A

release the brakes

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7
Q

When should you use chocks to park a trailer not equipped with spring brakes?

A

Always

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8
Q

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

A

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

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9
Q

To unlock the fifth wheel, put the release handle to the ___ position.

A

Open

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10
Q

Air and electric lines from the tractor to the trailer should be:

A

Secured, but with enough slack for turns

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11
Q

For a coupling to be completed, the safety lock for the fifth wheel locking lever must be:

A

over the locking lever

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12
Q

Why should you be sure that the fifth wheel plate is grased as required?

A

To prevent steering problems

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13
Q

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

A

At normal pressure

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14
Q

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

A

Turn wide as you complete your turn

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15
Q

When coupling, the proper position of the ffth wheel is:

A

Tilted down towards the end of the tractor

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16
Q

A tractor with an ___ trailer requires the shortest stopping distance.

A

Fully loaded

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17
Q

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

A

The tractor ahead gently with the trailer brakes locked

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18
Q

In general, the higher you truck’s “center of gravity”the:

A

Easier it is to turn over

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19
Q

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

A

None

20
Q

When checking that the trailer is securely to the tractor, the landing gear should be:

A

Slightly raised

21
Q

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

A

Neutral

22
Q

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

A

It is raised slightly when the tractor is backed under it

23
Q

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

A

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

24
Q

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

A

Emergency

25
Q

There are two things that can prevent a rollover. They are: Keep the cargo as close to the ground as possible; and :

A

Go slow around turns

26
Q

You should Not back a tractor under a trailer until the whole system air system is:

A

At normal pressure

27
Q

The best way to tell if you trailer has started to skid is to:

A

See it in your mirrors

28
Q

Which one of thesr vehicles off-track the most?

A

5-axle tractor towing a 52-foot trailer

29
Q

Glad hands are used to connect the:

A

Service and the emergency air lines from the truck to the trailer

30
Q

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

A

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

31
Q

A trailer is most likely to jackknife when it is:

A

Empty

32
Q

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

A

Fully raised with the crack handle secured in its bracket

33
Q

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

A

makes firm contact with the ground and lifts the trailer off of the fifth wheel

34
Q

Compared to a straight truck or bus, there are ___ things to inspect on a combination vehicle

A

More

35
Q

To unlock he fifth wheel, pull the release handle to the ___ position

A

Open

36
Q

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

A

It will keep water out of the lines

37
Q

After you have coupled the trailer, you should begin raising the landing gear by using the ___ gear

A

Low

38
Q

After the trailer has been coupled to the tractor, the tractor protection control valve should be placed in the ___ position

A

Normal

39
Q

Why should yo be sure that the fifth wheel plate is greased as required?

A

To prevent steering problems

40
Q

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

A

Applying/releasing the trailer brakes and listening for brake sounds

41
Q

when you get ready to back under a semitrailer, you should line up:

A

Directly in front of the trailer

42
Q

After you lock the kingpin into the fifth wheel, you should check the connectiong by pulling:

A

The tractor ahead gently with the trailer brakes locked

43
Q

If you cannot male a turn without entering another traffic lane, you should:

A

Turn wide as you complete you turn

44
Q

When backing a tractor under a trailer you should:

A

Always use the lowest reverse gear

45
Q

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

A

Trailer brakes are on

CDL (3 decks)

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