气刹测试 – 美国驾照

气刹知识测试

题库共有100题，每次随机刷新25题，正确率80%以上即为通过。

完全正确！解释：点踩制动法：把刹车踩到底；车轮**一抱死**就松开；只要车轮**重新滚动**就再次把刹车踩到底。 / Exactly! EXPLANATION: Stab braking means that you: apply your brakes all the way, and release brakes when wheels lock up. As soon as the wheels start rolling, apply the brakes fully again.

1 / 20

紧急停车时你应该？ / In an emergency stop you should?

用力制动但不要抱死车轮。 / Use the brakes hard without locking the wheels.

使用点踩制动法（stab braking）。 / Use the stab braking method

同时使用手控阀和行车制动。 / Use the hand valve and service brakes.

答对了！解释：空气压缩机通常在约 100 psi 开始充气、约 125 psi 停止，因此在约 125 psi 时系统可视为充满。 / Bingo! EXPLANATION: Pumping by the air compressor should start at about 100 psi and stop at about 125 psi.

2 / 20

典型的空气制动系统在下列压力下被视为充满： / A typical air brake system is fully charged at

150 psi。 / 150 psi.

125 psi。 / 125 psi.

75 psi。 / 75 psi.

正确！解释：制动鼓或制动盘上的裂纹长度不得超过摩擦区域宽度的二分之一。 / Correct! EXPLANATION: Brake drums or discs must not have cracks longer than one half the width of the friction area.

3 / 20

制动鼓上的裂纹长度不得超过摩擦区域宽度的_____？ / Brake drums must not have cracks longer than _____ the width of the friction area?

1/2（二分之一） / 1/2

1/4（四分之一） / 1/4

1/8（八分之一） / 1/8

正确！解释：切勿在未拉驻车制动或未垫轮挡的情况下把车辆置于无人看管状态，否则可能溜车并造成伤害或损失。 / Right! EXPLANATION: Never leave your vehicle unattended without applying the parking brakes or chocking the wheels. Your vehicle might roll away and cause injury and damage.

4 / 20

什么时候可以不拉驻车制动或不垫轮挡就把卡车置于无人看管状态？ / When can you leave your truck unattended without first applying the parking brakes or chocking the wheels?

如果只离开几分钟 / If you will only be away from the truck for a few minutes

从不可以 / Never

如果要做出车前检查 / If you will be conducting your pre-trip inspection

正确！解释：牵引车保护阀可在挂车脱离或发生严重泄漏时**保持牵引车**制动系统内的空气；当气压过低（通常 **20–45 psi**）时会自动关闭。 / Correct! EXPLANATION: The tractor protection valve keeps air in the tractor or truck brake system should the trailer break away or develop a bad leak, and it will close automatically if air pressure is low (typically 20-45 psi).

5 / 20

牵引车保护阀（tractor protection valve） / The tractor protection valve

以上皆是。 / does all of the above.

为制动系统提供供气。 / provides the air supply for the brake system.

当供气降到某一水平时会自动关闭。 / will close automatically if the air supply drops to a certain level.

当你拉起驻车制动时会关闭。 / will close if you apply the parking brakes.

答对了！解释：在一些车辆上，仪表台的控制手柄可逐步施加弹簧制动，称为调制阀。它有弹簧回馈，手感清晰；手柄推得越多，弹簧制动施加得越重。 / Bingo! EXPLANATION: In some vehicles a control handle on the dash board may be used to apply the spring brakes gradually. This is called a modulating valve. It is spring-loaded, so you have a feel for the braking action. The more you move the control lever, the harder the spring brakes come on.

6 / 20

调制控制阀（modulating control valve）允许你控制： / The modulating control valve allows you to control the

制动系统中的压力大小。 / amount of pressure in the brake system.

弹簧制动。 / spring brakes.

前轮制动。 / front brakes.

答对了！解释：低气压警报亮起，应尽快安全停车并靠边。 / Bingo! EXPLANATION: If the low air pressure warning comes on, stop and safely park your vehicle as soon as possible.

7 / 20

若低气压警报亮起，你首先应该做什么？ / What is the first thing you should do if the low air pressure warning comes on?

停车。 / Stop.

升挡。 / Upshift.

降挡。 / Downshift.

正确！解释：警报失灵时，气压丢失你可能毫无察觉：在单回路系统中可能触发突然的紧急制动；在双回路系统中则制动距离会变长，弹簧制动很快介入，能用的制动十分有限。 / Right! EXPLANATION: If the warning signal doesn’t work, you could lose air pressure and you would not know it. This could cause sudden emergency braking in a single-circuit air system. In dual systems the stopping distance will be increased. Only limited braking can be done before the spring brakes come on.

8 / 20

如果低气压警报失灵， / If the low air pressure warning signal is not working,

在单回路空气制动系统中可能导致突然的紧急制动。 / it may lead to sudden emergency braking in a single-circuit air system.

你也许会失压，但至少还能知道。 / you may lose air pressure, but at least you'll know about it anyway.

以上都不会发生。 / neither of the above will happen.

完全正确！解释：要让车辆停下，制动蹄/衬片会被压向制动鼓内侧，通过摩擦来减速。 / Bingo! EXPLANATION: To stop, the brake shoes and linings are pushed against the inside of the drum. This causes friction, which slows the vehicle.

9 / 20

要使制动处于施加状态，制动衬片应当_____？ / The brake pads should be _____ for the brakes to be on?

磨损到危险的薄度。 / Worn dangerously thin.

贴紧制动鼓。 / Against the drum.

磨损到 1/32 英寸。 / Worn 1/32 of an inch.

与行程调节器断开连接。 / Disconnected from the slack adjusters.

正确！解释：在正常行驶中，踩下踏板时施加并释放制动的是行车制动系统。 / Correct! EXPLANATION: The service brake system applies and releases the brakes when you use the brake pedal during normal driving.

10 / 20

在驾驶员使用制动踏板时负责施加并释放制动的是： / The brake system that applies and releases the brakes when the driver uses the brake pedal is the:

驻车制动系统。 / Parking brake system.

紧急制动系统。 / Emergency brake system.

行车制动系统。 / Service brake system.

正确！解释：当你踩下制动踏板，空气会进入每个制动室。 / Right! EXPLANATION: When you push the brake pedal, air is let into each brake chamber.

11 / 20

当你踩下制动踏板时， / When you press the brake pedal,

压缩空气从储气筒释放出来。 / compressed air is released from the air tanks.

压缩空气从制动室释放出来。 / compressed air is released from the brake chambers.

压缩空气进入制动室。 / compressed air enters the brake chambers.

正确！解释：离车前应**拉好驻车制动**或**垫好轮挡**；例外是刹车**很烫**或**很湿且天气很冷**时，改用轮挡。 / Right! EXPLANATION: Never leave your vehicle unattended without applying the parking brakes or chocking the wheels. Your vehicle might roll away and cause injury and damage. Exceptions are when the brakes are very hot, or wet and it is very cold outside. In this case use wheel chocks.

12 / 20

你应在何时使用驻车制动？ / When should you use the parking brake?

每次离开车辆时都要用（少数例外）。 / Every time you leave your vehicle, with a few exceptions

只有长时间离车时才用。 / Only if you are away from your vehicle for an extended period of time

任何时候只要离开车辆都要用。 / Every time you leave your vehicle for any length of time

只在车辆很多的城市区域使用。 / Only in urban areas where there are many other vehicles

正确！解释：研究表明，前轮制动在各种天气和驾驶条件下都适用；即便在结冰路面，前轮制动也不太可能引发侧滑。 / Right! EXPLANATION: Front wheel brakes have been shown to be ideal under all weather and driving conditions. Front wheel braking is unlikely to cause a skid even on icy roads.

13 / 20

在哪些条件下前轮制动是合适/有效的？ / Under which conditions are front wheel brakes good?

仅在潮湿或结冰条件下 / Wet or icy conditions only

无 / None

只在良好天气 / Good weather only

各种天气条件下 / All weather conditions

完全正确！解释：空气制动实际上包含三套系统：行车制动、驻车制动与紧急制动；无线电通信系统不属于空气制动系统。 / Exactly! EXPLANATION: Air brakes are really three different braking systems: service brake, parking brake, and emergency brake.

14 / 20

下列哪一项不属于空气制动系统？ / Which of the following is NOT part of the air brake system?

紧急制动系统 / Emergency brake system

无线电通信系统 / Radio signal system

驻车制动系统 / Parking brake system

行车制动系统 / Service brake system

正确！解释：即便警报来自**副**系统，也必须在安全地点停车并修复后再行驶；在低气压警报亮起的情况下继续行驶不安全。 / Correct! EXPLANATION: Even if the low-pressure alarm is for the secondary system you need to stop at a safe location, park, and get the issue fixed. It is unsafe for the vehicle to remain in motion with a low air alarm.

15 / 20

你的车辆为双回路空气制动，如果副系统出现低气压警报，你应该？ / Your vehicle has a dual air brake system, if a low air pressure warning comes on for the secondary system, you should?

降低车速并在行驶中测试剩余系统。 / Reduce your speed and test the remaining system while underway.

停车、在安全地点靠边，修好后再继续。 / Stop, safely park, and continue only when the system is fixed.

降速行驶到最近的修理厂再修理。 / Reduce your speed and drive to the nearest garage for repairs.

正确！解释：在储气筒靠压缩机的一侧装有单向止回阀，只允许空气进入储气筒，不允许回流到压缩机侧。 / Right! EXPLANATION: Installed on the compressor side of the air tank is a one-way check valve, it allows air into the tanks, but does not allow it to flow back to the compressor.

16 / 20

如果空气压缩机一侧发生泄漏，是什么使储气筒中的空气不会回流泄出？ / If the air compressor should develop a leak, what keeps the air in the tanks?

单向止回阀 / The one-way check valve

紧急继动阀 / The emergency relay valve

牵引车保护阀 / The tractor protection valve

正确！解释：压缩空气通常含有水和少量压缩机油，这对空气制动系统不利。例如，水在寒冷天气会结冰并导致制动失效。 / Correct! EXPLANATION: Compressed air usually has some water and some compressor oil in it, which is bad for the air brake system. For example, the water can freeze in cold weather and cause brake failure.

17 / 20

如果不排空储气筒中的水油， / If the air tanks are not drained,

变速箱油可能会漏光。 / your transmission fluid may drain out.

左侧制动会停止工作。 / your left side brake will cease to operate.

水结冰可能导致制动失效。 / your brakes may fail because of water freezing.

你会开得太快。 / you will drive too quickly.

答对了！解释：行程调节器是空气制动的重要部件，用于调整制动间隙；在盘式与鼓式制动上的位置不同。 / Bingo! EXPLANATION: Slack adjusters are an important part of your air brake system that allows you to adjust the brakes to ensure that they are safe. They are located in different places, depending on the type of brakes that you have.

18 / 20

行程调节器是 / Slack adjusters are

以上全部。 / all of the above.

空气制动系统中用于调整制动的部件。 / a part of the air brake system that is used to adjust the brakes.

（盘式制动）位于动力丝杠与推杆之间。 / between the power screw and push rod on disc brakes.

（鼓式制动）位于推杆与 S 形凸轮之间。 / between the push rod and S-cam on drum brakes.

答对了！解释：在干燥路面、时速 55 英里时，空气制动的迟滞会额外增加约 32 英尺的距离。 / Bingo! EXPLANATION: The air brake lag distance at 55 mph on dry pavement adds about 32 feet.

19 / 20

在时速 55 英里时，制动迟滞造成的距离约为多少英尺？ / Brake lag distance at 55 mph is _____ feet?

50 英尺 / 50

32 英尺 / 32

23 英尺 / 23

完全正确！解释：交通部要求：**1998 年 3 月 1 日及以后**生产的空气制动车辆必须配备 ABS。 / Exactly! EXPLANATION: The Department of Transportation requires that ABS be on: air brake vehicles built on or after March 1, 1998.

20 / 20

如何判断车辆是否配备了防抱死制动系统（ABS）？ / How can you tell if your vehicle is equipped with an antilock braking system (ABS)?

查看是否为 1998 年后出厂。 / Check if the vehicle was manufactured after 1998.

查看是否为 2000 年后出厂。 / Check if the vehicle was manufactured after 2000.

ABS 仍是可选配置。 / ABS is still optional.

查看是否为 2010 年后出厂。 / Check if the vehicle was manufactured after 2010.

您的分数是

平均分为 80%