组合车辆测试

组合车辆测试

题库共有99题,每次随机刷新20题,正确率80%以上即为通过。

Trailers that do not have spring brakes have emergency brakes, which work from the air stored in the trailer air tank. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on, but the brakes will hold only if there is air pressure in the trailer air tank. Eventually, the air will leak away and then there will be no brakes. Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. / 没有弹簧制动的挂车仅靠挂车气罐里的空气维持紧急制动;空气最终会泄光,届时将没有制动,因此必须用轮挡

1 / 20

You should use chocks when parking a trailer without spring brakes because / 停放一台没有弹簧制动的挂车时应使用轮挡,因为

Brake the same way, regardless of whether you have ABS on the tractor, the trailer, or both. / 无论 ABS 安装在牵引车、挂车,还是两者都有,制动方法相同;ABS 只是帮助防抱死。

2 / 20

An antilock braking system (ABS) is useful / 防抱死制动系统(ABS)在以下哪种配置下有用?

If you do cross the air-lines, supply air will be sent to the service line instead of going to charge the trailer air tanks. Air will not be available to release the trailer spring brakes. If the spring brakes don't release when you push the trailer air supply control, check the air-line connections. / 若把两根气管接反,供气会被送到行车管路而非充满挂车储气罐,导致弹簧制动无法释放。若按下挂车供气控制后仍不释放,应检查气管连接。

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If the brakes did not release when you pushed the trailer air supply valve, you should / 当你按下挂车供气阀,但制动没有释放,你应该

Make sure air pressure is up to normal. / 确保空气压力达到正常值

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You should not back a tractor under a trailer until the whole air system is: / 在整套空气系统达到下列哪种状态之前,你不应把牵引车倒入挂车底下:

One good rule says you need at least one second for each 10 feet of vehicle length at speeds below 40 mph. At greater speeds, you must add 1 second for safety. / 一个常用规则:40 mph 以下时,每 10 英尺车长应留 1 秒间隔;更高速度需再加 1 秒

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Under good driving conditions, you should leave at least one second of space between your vehicle and the vehicle ahead for every ___ feet of your vehicle's length. / 良好路况下,你与前车至少应保持的时间间隔为:每 ______ 英尺车长留出一秒。

When a vehicle goes around a corner the rear wheels follow a different path than the front wheels, and this is called off-tracking or "cheating." Longer vehicles will off-track more. If there is more than one trailer, the rear wheels of the last trailer will off-track the most. / 车辆转弯时后轮走出的轨迹与前轮不同,称为“偏轨”。车越长偏轨越大;若有多节挂车,最后一节的偏轨最大。

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Which of these vehicles off-tracks the most? / 以下哪种车辆的偏轨量最大?

Make sure air pressure is up to normal before backing under the trailer. / 在把牵引车倒入挂车底下前,确保空气压力达到正常值

7 / 20

You should not back a tractor under a trailer until the whole air system is / 在整套空气系统 ______ 之前,你不应把牵引车倒入挂车底下。

Triples have a rearward amplification of 3.5. This means you can roll the last trailer of triples 3.5 times as easily as a five-axle tractor. While the rearward amplification of a double is around 2. / 三挂的后向放大约为 3.5,也就是说,它最后一节挂车比五轴牵引车更容易翻车约 3.5 倍;双挂约 2。

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Which type of truck-trailer combination has the greatest chance of a "crack-the-whip" rollover? / 哪种牵引车-挂车组合最容易发生“鞭甩效应”(crack‑the‑whip)导致翻车?

Use lowest reverse gear. Back tractor slowly under trailer to avoid hitting the kingpin too hard, and stop when the kingpin is locked into the fifth wheel. / 使用最低倒挡,缓慢把牵引车倒到挂车下,避免猛烈撞击牵引销;当牵引销锁入五轮时再停下。

9 / 20

When backing a tractor under a trailer, you should / 把牵引车倒到挂车下方时,你应该:

Some vehicles have "dead end" or dummy couplers to which the hoses may be attached when they are not in use. This will prevent water and dirt from getting into the coupler and the air-lines. / 有些车辆配有“死端”假接头,未用时把手爪接头接上去,可防止水和尘土进入接头与气管。

10 / 20

If your vehicle is equipped with dummy couplers, why should you connect the glad hands to them? / 如果车辆配有假接头(dummy couplers),为什么要把手爪接头(glad hands)接到它们上?

The trailer should be low enough that it is raised slightly by the tractor when the tractor is backed under it. Raise or lower the trailer as needed. If the trailer is too low, the tractor may strike and damage the trailer nose; if the trailer is too high, it may not couple correctly. / 挂车应略低于五轮,使牵引车倒入时能将挂车稍微托起。过低可能撞伤挂车鼻部;过高可能无法正确挂接。

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You are coupling a semi-trailer to your tractor but have not yet backed under. The trailer is at the right height when: / 你在将半挂车与牵引车连接,但尚未倒到车底;何时算挂车高度正确?

The emergency line also called the supply line has two purposes. First, it supplies air to the trailer air tanks. Second, the emergency line controls the emergency brakes on combination vehicles / 应急管路(亦称供气管路)有两大作用:其一向挂车储气筒供气;其二控制组合车辆的紧急制动

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What is the emergency air line? / 什么是应急气路(emergency air line)?

Large combination vehicles take longer to stop when they are empty than when they are fully loaded. When empty, the very stiff suspension springs and strong brakes give poor traction and make it very easy to lock up the wheels causing the tractor to jackknife. / 大型组合车在空载时比满载更难刹住;悬架更硬、制动更猛,抓地差、更容易抱死并导致折叠。

13 / 20

A trailer is most likely to jackknife when it is / 挂车最可能发生折叠(jackknife)的情况是:

– 45 psi. This will cause the spring brakes to come on. / 反复踩放踏板使气压下降到 20–45 psi,这会使弹簧制动介入

14 / 20

To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and / 测试牵引车保护阀时,给挂车制动系统充气、熄火,然后

Shut the engine off so you can hear the brakes. Apply and release trailer brakes and listen for sounds of trailer brakes being applied and released. You should hear the brakes move when applied and air escape when the brakes are released. / 熄火以便听得更清楚;反复施加并释放挂车制动,应能听到作动与泄气的声音。

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After you supply air to the trailer, make sure the airlines are not crossed and the trailer brakes are working. This is done by: / 向挂车供气后,要确认气管未交叉且挂车制动工作正常。正确做法是:

If there are no dummy couplers, the glad hands can sometimes be locked together. It is very important to keep the air supply clean and free of moisture. / 如果没有“死端”假接头,可把两只手爪接头互锁在一起。关键是保持空气清洁并无湿气

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Why should you lock the tractor glad hands to each other or to the storage bracket when you are not towing a trailer? / 为什么在不拖挂挂车时,要把牵引车的手爪接头(glad hands)互锁,或锁在储存支架上?

Check that the safety latch is in position over locking lever. On some fifth wheels the catch must be put in place by hand. / 确认安全卡扣扣在锁柄上方。某些五轮的卡扣需要手动放置。

17 / 20

The safety catch for the fifth wheel locking lever must be _____ for a coupling to be complete. / 要完成挂接,五轮锁柄的安全卡扣必须位于

There are more things to inspect on a combination vehicle than on a bus or straight truck. First, of course, there is the entire coupling system: the kingpin, the fifth wheel, etc. Next, there is the landing gear of each trailer. Not to mention a few more axels to check. / 组合车要检查的项目更多:不仅有整个挂接系统(牵引销、五轮等),还有各挂车的支腿,以及更多的车轴。

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Compared with a straight truck or bus, there are _______ things to inspect in combination vehicles. / 与直卡或大巴相比,组合车辆需要检查的项目

The earliest way to notice that your trailer is jackknifing is to see it swinging out in your mirrors. / 挂车开始形成折刀(jackknife)的最早迹象,是你会从后视镜里看到它向外摆动。

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The best way to tell if your trailer has started to skid is to / 判断挂车是否开始侧滑的最佳方法是

With a fully-charged air system, turn off the engine, release the parking brake; and time the air pressure drop. The loss rate should be less than three psi in one minute for combination vehicles, we do not add the additional second here because the brakes are released. / 气压充满后,熄火、释放驻车制动并计时气压下降;组合车辆在 1 分钟内的压降应小于 3 PSI

20 / 20

The air leakage rate for a combination vehicle (engine off, brakes off) should be no more than ____ PSI per minute. / 组合车辆(发动机熄火、制动释放)的允许漏气率,每分钟不应超过 ____ PSI。

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