美国卡车驾照拖挂组合理论模拟题库-美国驾照考试

驾驶拖挂组合车辆可以成为您商业驾驶生涯中不可或缺的一部分。

不过，在达到这一点之前，您需要通过美国DMV的考试，证明您已经掌握了安全驾驶这些车辆所需的专业知识。

以下30个问题来自官方2022年美国商业车驾照手册，仅涵盖拖挂组合车辆，以帮助您准备此特定的DMV测试。祝你在练习考试和真正考试的时候好运！

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

Make firm contact with the ground, then crackle hits a low gear a few extra turns – 正确答案
Make contact with the ground and leave the trailer off the fifth wheel
Reaches the ground
none of these answers are correct

当要将车头与载有货物的拖斗分离时，应放低起落架，使其与地面牢固接触，然后继续将起落架摇杆使用低挡额外的转多几圈。

To stop a trailer skid you should:

none of these answers are correct
Countersteer
Release the service brakes – 正确答案
Use the trailer hand brakes

要阻止拖斗打滑，应释放服务刹车器（Service Brake）

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

The connected brake circuit becomes a back up air tank
It will keep dirt and water out of the lines – 正确答案
They will be leaking air
Tractor’s emergency brake control knob will come on

不拖曳拖斗时，应将卡车后方的刹车气管相互锁定(或锁定在虚拟耦合器上)，以防止污垢或水进入刹车气管中。

Which of these statements is true?

None of these answer are correct
Light vehicles need more braking power to stop than heavy ones
Bobtail tractors can take longer to stop than a combination vehicle loaded to maximum gross weight – 正确答案
The brakes and suspension systems of combination vehicles work best with a light load.

短尾牵引车要比装载至最大毛重的混合卡车需要更长的时间停下来

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

To ensure a good electrical connection
none of these answers are correct
To reduce heat and noise
To prevent steering problems – 正确答案

你应该确保对牵引座（第五轮）板进行了润滑以防止转向问题。

Air brake equipped trailers made before 1975

Usually need a glad hand converter
Cannot be legally operated on interstate highways
Often do not have spring brakes – 正确答案
None of these answers are correct

1975年之前制造的配备气刹的拖斗通常没有弹簧刹车系统

After the trailer has been coupled to the tractor. the tractor protection control valve should be placed in what position?

Up
Normal – 正确答案
Left
Down

将卡车车头连接到卡车拖车之后。卡车车头的保护控制阀应置于正常位置。

Compared to a straight truck or bus there are __ things to inspect in a combination vehicle

Few
The same number
None of these answers are correct
More – 正确答案

与货车或巴士相比，混合卡车做车身检查时，需要检查的东西更多

When backing a tractor under a trailer. You should:

Always approach the trailer at a slight angle
Do it quickly to ensure that the kingpin is locked into the fifth wheel
Always use the lowest reverse gear – 正确答案
Always use the highest reverse gear

将卡车倒到拖斗的下方时，你应始终使用最低的倒档。

When you get ready to back under semitrailer you should line up:

Directly in front of the trailer – 正确答案
The left rear outer dual wheel with the kingpin
The kingpin to engage the driver’s side locking jaw first
None of these answer are correct

当你准备好将车头倒车连接半挂车时，你应该尽量将车头与挂车直线对其

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

Tractor spring brake to lock up
Trailer tank pressure to be lost
None of these answer are correct
Trailer emergency brakes to come on – 正确答案

当你踩刹车时，卡车的服务刹车系统出现严重的漏气，这时服务刹车系统的气将逸出并导致挂车的紧急刹车系统开启 ( 紧急刹车按钮会弹出 )

When driving a set of doubles. it is necessary to close which shut-off valve in the last trailer

None of these answer are correct
Middle section
Back – 正确答案
Front

当你要驾驶一辆拉着双拖斗的卡车，在行驶前，必须确定关闭最后一个拖斗中的后向截止阀。

You have coupled with a semitrailer. Where should you put the iron trailer supports before driving away

Raised 1/4 way with the crank handle secured in its bracket
3 turns off the top with the crank handle secured in its bracket
Fully raised with the crank handle secured in its bracket – 正确答案
Raised 1/2 way with the crank handle secured in its bracket

当车头已经与拖斗连接上，准备开车离开之前，应完全的将拖车支架收起，并将曲柄固定在支架上的收放处。

The semitrailer made before 1975 that are equipped with the air brakes:

Often do not have spring brakes – 正确答案
Have only a emergency air line
Usually need a glad hand converter
Have only a service air line

1975年之前生产的装有气刹的半挂车通常没有弹簧刹车系统

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

Tilted down toward the front of the tractor
Tilted up toward the end the trailer
Level of the ground
Tilted down toward the end of the trailer – 正确答案

当车头连接时，牵引座（第五轮 / fifth wheel ）的正确位置应该是朝拖斗的方向，向下倾斜

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

The parking lock is off and you 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 – 正确答案
All these answers are true

如果当卡车车头连接到拖斗后，车头的牵引座锁定杆未关闭，这意味着车头连接拖斗不正确，切勿在此情况未解决前上路。

Before you back under a trailer, make sure that:

none of these answers are correct
the tractor protection valve is normal
the trailer brakes are locked – 正确答案
the air supply knob is in

在将车头倒到拖斗下方之前，请确保拖斗的刹车为锁定状态。

After you supply air to the trailer. make sure the air lines are not crossed and the trailer brakes are working. This is done by:

Watching your mirrors to see if the trailer lights come on
None of these answers are correct
Lifting the brake pedal
Applying and releasing the trailer brakes and listening for the sound of the brake – 正确答案

向拖斗供气后，为确保服务刹车管和拖斗刹车管没有弄混了，且拖车刹车正在工作，可以通过踩放刹车然后听拖斗刹车的声音。

What will happen if the air lines are crossed when you hook up to an old trailer

none of these answers are correct
The brake lights will come on when the brake pedal is pressed
If the trailer has no spring brakes, you could drive away but you wouldn’t have trailer brakes – 正确答案
The hand valve will apply the tractor brakes instead of the trailer brakes

连接旧的拖斗时，如果服务刹车气管与拖斗刹车气管弄混了。如果拖斗没有弹簧刹车器，你可以开车离开，但拖斗将没有刹车

When connecting the glad hands, press the two seals with the coupler together at what degree to each other?

120 degree
180 degree
90 degree – 正确答案
45 degree

当车头的刹车气管连接到拖斗时，应该将车头气管的密封橡皮圈以90度的角度，与拖斗的气管接收处的密封橡皮圈以90度的角度对齐

美国卡车驾照拖挂组合理论模拟题库