商业车驾照拖挂组合理论模拟题复习

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!

免费在线商业车驾照拖挂组合理论模拟考试


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

  1. None of these answer are correct
  2. Back - 正确答案
  3. Front
  4. Middle section

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。

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

  1. It will keep dirt and water out of the lines - 正确答案
  2. They will be leaking air
  3. The connected brake circuit becomes a back up air tank
  4. 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。

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

  1. Directly in front of the trailer - 正确答案
  2. None of these answer are correct
  3. The kingpin to engage the driver's side locking jaw first
  4. The left rear outer dual wheel with the kingpin

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 are coupling a tractor to a semi-trailer and have backed up but are not under it. What should you hook up before backing under?

  1. The electrical service cable
  2. None of these answers are correct
  3. Nothing, Back up and lock the fifth wheel
  4. The emergency and service air lines. - 正确答案

当你要将车头连接到半挂拖斗,你应该先连接好紧急刹车管线和服务刹车管线,然后再倒到拖斗下方

To unlock the fifth wheel the locking lever should be placed in the ___ position

  1. Neutral
  2. Left
  3. Closed
  4. Open - 正确答案

要解锁牵引座(又称第五轮)与挂车脱离,锁定杆应该处于打开位置

The air lines on a combination of vehicles are often colored to prevent them from mixing up. The emergency line is ___, the service line is ___

  1. Black, Yellow
  2. Green, Blue
  3. Red, Blue - 正确答案
  4. Brown, Red

组合车辆上的刹车管路通常带有颜色,以防止它们混淆。 紧急刹车管路是红色的,服务刹车管路是蓝色的。

When backing a tractor under a trailer. You should:

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

将卡车倒到拖斗的下方时,你应始终使用最低的倒档。

After connecting the air lines but before backing under the trailer you should:

  1. None of these answers are correct
  2. Make sure that the trailer brakes are off
  3. Supply air to the trailer system, then pull out the air supply knob - 正确答案
  4. Walk around the rig to be sure that is is clear

在倒车拖车下方之前,连接服务刹车和拖斗气管之后,应先向拖斗刹车系统供气,然后拉出空气供应旋钮

The higher the center of gravity of your truck. the:

  1. easier to turn around the corner
  2. easier to turn over - 正确答案
  3. more stable while turning
  4. None of these answer are correct

在行驶中,卡车的重心越高,转弯和紧急变道时越容易翻车

The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the __ brake line

  1. Emergency - 正确答案
  2. Hydraulic
  3. Service
  4. Parking

当紧急刹车管道中发生重大泄漏时,车头的保护阀将关闭,拖斗的紧急刹车将开启

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

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

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。

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

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

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

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

  1. None of these answer are correct
  2. Trailer emergency brakes to come on - 正确答案
  3. Tractor spring brake to lock up
  4. Trailer tank pressure to be lost

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 )

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

  1. Tractor's air to dump into the trailer tank through the service line
  2. none of these answers are correct
  3. Air compressor to unload instead of pumping air
  4. Emergency trailer brakes to come on - 正确答案

行驶期间,紧急空气管线断裂或被拉断。 压力损失将导致拖斗的紧急刹车按钮弹出,导致拖斗紧急刹车。

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

  1. Straight up
  2. None of these answers are correct
  3. Under the locking lever
  4. Over the locking lever - 正确答案

以确保车头与拖斗正常连接,牵引座(第五轮)锁定杆的安全锁必须在锁定杆上方

A tractor with a __ trailers requires the shortest amount of the stopping distance.

  1. Lightly loaded
  2. Fully loaded - 正确答案
  3. Empty
  4. None of these answers are correct

一部卡车拉满载货物的挂车需要最短的停止距离

If the service line comes apart while you are driving a combination vehicle but the emergency line stays together, What will happen right away?

  1. Nothing is likely to happen until you try to apply the brakes - 正确答案
  2. The emergency trailer brakes will come on
  3. The trailer's tank will exhaust through the open line
  4. None of these answers are correct

如果您在驾驶一部组合卡车时服务刹车管道脱落,但紧急刹车管道还保持在一起,那么除非你尝试踩刹车,否则一般情况下什么都不会发生

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

  1. The parking lock is off and you may drive away
  2. All these answers are true
  3. The trailer will not swivel on the fifth wheel.
  4. The coupling is not right and should be fixed before driving the coupled unit - 正确答案

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。

There are two things that a driver can do to prevent a rollover. They are: (1) keep the cargo as close to the ground as possible, and (2):

  1. none of these answers are correct
  2. Keep both hands firmly on the steering wheel
  3. Make sure that the brakes are properly adjusted
  4. Go slow around turns - 正确答案

驾驶员可以做两件事来防止拖斗在行驶途中翻了。 它们是:(1)保持货物尽可能靠近地面,(2)转弯时要慢一些

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

  1. To reduce heat and noise
  2. To prevent steering problems - 正确答案
  3. none of these answers are correct
  4. To ensure a good electrical connection

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。

商业车驾照拖挂组合理论模拟考试