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CA CDL Written Test > Combination Vehicles > Flashcards

Combination Vehicles Flashcards

1
Q

What is one important thing to do to prevent a rollover?

A

Keep cargo as close to ground as possible

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2
Q

When you turn suddenly while pulling doubles, which trailer is most likely to turn over?

A

Keep cargo as close to ground as possible

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3
Q

When should you use the trailer handbrake to straighten out a jackknifing trailer?

A

Never

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4
Q

What is “offtracking”?

A
  1. When the rear wheels follow a different path than the front wheels
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5
Q

Why should you not use the trailer hand valve while driving?

A
  1. Can make the trailer skid
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6
Q

What does the trailer air supply control do?

A

Supplies air to the trailer

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7
Q

What is the service line for?

A
  1. Carries air controlled by the footbrake or trailer handbrake
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8
Q

1)What is the emergency air line for?

A
  1. Supplies air to the trailer air tanks
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9
Q

Where are shut off valves?

A

At the back of trailers

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10
Q

Why should you lock the glad hands together or to a dummy coupler, when not pulling a trailer?

A
  1. Keeps water and dirt out of the lines
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11
Q

How much space should there be between the upper and lower 5th wheel plates?

A

no space at all

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12
Q

If the trailer breaks away and pulls apart the air lines, the trailer brakes would apply, and:

A
  1. The tractor brakes to keep working
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13
Q

When hooking a trailer to a tractor, the trailer is at the right height when:

A

The coupling surface of the trailer is just below the middle of the tractor 5th wheel

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14
Q

After hooking the trailer to the tractor, check the 5th wheel connection by

A

Pulling the tractor ahead gently with the trailer brakes locked

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15
Q

What will happen right away if the service line disconnects while you are driving?

A

Nothing until you try the brakes

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16
Q

When backing up under a trailer, you should line up:

A

Directly in front of the trailer

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17
Q

When hooking a tractor to a semi trailer, after connecting both air lines and before backing under the trailer, you should

A

Supply air to the trailer system, then pull the air supply knob to lock the brakes

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18
Q

How do you supply air to the tank on the trailer?

A

Push in the trailer air supply valve

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19
Q

What color is the emergency air line on a combination vehicle?

A

Red

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20
Q

When should the valve hand be used to park a combination vehicle?

A

Never

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21
Q

Air brake equipped trailers that were made before 1975:

A

Usually don’t have spring brakes

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22
Q

After coupling a semitrailer, how should you crank up(启动) the front trailer supports?

A

Fully raised with crank handle secured

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23
Q

What can happen when a driver crosses the air lines on an older trailer?

A

If the trailer does not have spring brakes, you may drive but wouldn’t have trailer brakes

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24
Q

When the 5th wheel locking lever is not locked after the jaws close around the kingpin, what may happen?

A

The coupling should need to be corrected before driving the coupled unit

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25
Q

With the brakes released and the engine off, a combination vehicle air brake system should not leak more than psi in one minute.

A

3

26
Q

What is one thing a driver can do to prevent a rollover?

A

Slow down before entering a turn

27
Q

After pushing in the trailer supply valve, do not move the tractor until the entire air system is:

A

Is above 60 psi and the warning buzzer has stopped

28
Q

After hooking a tractor to a semitrailer, what should you do before backing under it?

A

Hook up the service line and emergency line

29
Q

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

A

The shank

30
Q

You should test the semi trailer connection for security by:

A

Pulling gently forward in low gear against the locked trailer brakes, then looking at it carefully

31
Q

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

A

To prevent steering problems

32
Q

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

A

Applying and releasing the trailer brakes and listening for sounds

33
Q

What can be done to prevent a rollover?

A

Slow down around turns

34
Q

What is one thing you should do before backing under a trailer?

A

Make sure the trailer brakes are locked

35
Q

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

A

Over the locking lever

36
Q

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

A

There is enough clearance between the tops of the tractor tires and the nose of the trailer and there is enough clearance between the kingpin and the 5th wheel

37
Q

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

A

Trailer emergency brakes to come on

38
Q

When backing under a trailer, you should expect:

A

Trailer to be lifted slightly when the tractor backs under

39
Q

You have coupled with a semi trailer. In what position should you put the front trailer supports before driving away?

A

Fully raised with the crank handle secured in its bracket

40
Q

Which of these statements is true?

A

Bobtail tractors can take longer to stop than combination vehicles loaded to the maximum gross weight.

41
Q

What should the hand valve be used for?

A

To test the trailer brakes

42
Q

Fully loaded rig(n. 重型铰接式开车)s are 10 times more likely to roll over in a crash than empty rigs.

A

T

43
Q

Cargo should be kept as high off the ground as possible.

A

F

44
Q

The crack-the-whip(n. 鞭子) effect is caused by rearward(a. 在后面的) amplification(n. 放大).

A

T

45
Q

Heavily loaded trailers are more likely to jackknife (v.（铰接车失控时）弯折成V形) than lightly loaded trailers.

A

F

46
Q

1)It takes a bobtail longer to stop than a fully loaded tractor-trailer.

A

T

47
Q

If you go into a trailer skid, you should use the trailer hand brake to straighten out.

A

F

48
Q

Before starting a right turn, you should swing wide to the left.

A

F

49
Q

The trailer hand valve should never be used for parking.

A

T

50
Q

The rear wheels of the trailer will offtrack the most.

A

T

51
Q

The tractor protection valve keeps air in the tractor if the trailer breaks away.

A

T

52
Q

Dummy, or dead end couplers prevent water and dirt from getting into the coupler and air lines.

A
53
Q

The 5th wheel plate could cause steering problems if not kept properly lubricated.

A

T

54
Q

Always back your tractor under your trailer at an angle.

A

F

55
Q

The trailer does not need to be level when the tractor is backed under it.

A

T

56
Q

The tractor emergency air line should be connected to the trailer emergency glad hand.

A

T

57
Q

Crossed air lines are only dangerous if you do not have a tractor emergency brake.

A

F

58
Q

When properly coupled, the 5th wheel jaws should be closed around the shank of the kingpin.

A

T

59
Q

There are two things a driver can do to prevent a rollover. They are, keep the weight in your vehicle as close to the floor as possible and:

A

Go slow around corners.

60
Q

A device which corrects for brake lag on vehicles with air brakes is ?

A

Relay valve

CA CDL Written Test (3 decks)

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