商业车驾照气刹理论模拟题复习

驾驶带有空气制动器的车辆需要获取气刹许可证。 在美国，要获得此认可证，申请人必须通过气刹原理考试。 考试由25道选择题组成。 每个问题有四个答案选择。 要通过，申请人必须正确回答至少20个问题。 大部分测试题来自纽约州商用机动车辆驾驶员手册。空气制动器许可证可与 A、B 或 C级的驾照一起使用。

免费在线商业车驾照气刹理论模拟考试

The modern air brake system combines three different systems. They are the service, the parking, and __ brakes.

  1. Emergency - 正确答案
  2. Foot
  3. None of these answers are correct
  4. Drum

现代的气压刹车系统结合了三种不同的系统。 它们是服务(行车)，泊车和紧急刹车。

The application pressure gauge shows how much air pressure you:

  1. Have in the air tanks
  2. Are applying to the brakes - 正确答案
  3. None of these answers are correct
  4. Have in a modulating control valve

应用压力表 - 显示你正在向刹车器施加多少气压

It is not safe to drive a vehicle that has brake drums with cracks that are longer than __ of the width of the friction area

  1. 1/8
  2. 1/4
  3. 1/2 - 正确答案
  4. 1/3

驾驶刹车盘裂纹大于摩擦区域宽度的1/2的车辆是不安全的

Emergency stab braking is:

  1. Use light steady pressure on the brake pedal
  2. Press on the brake pedal as hard as you can, release the brakes when the wheels locked, brakes again when the wheels start rolling - 正确答案
  3. When you press hard on a brake pedal and apply hand valve while you stop
  4. None of these answers are correct

紧急点刹是指在遇到紧急情况时，尽可能用力踩刹车踏板，当车轮锁住时释放刹车踏板，然后在车轮重新开始滚动时再次踩下刹车踏板

Air braking takes more time than hydraulic braking because:

  1. Air brakes require heavier return springs
  2. Air brakes use different brake drums
  3. None of these answers are correct
  4. Air takes more time to flow through the lines than hydraulic fluid - 正确答案

气刹比液压刹车需要更多时间，因为空气比液压油需要更多的时间流经管线

The safety valve discharges automatically at the pressure of:

  1. 50
  2. 120
  3. 100
  4. 150 - 正确答案

安全阀在150 PSI的压力下自动排放

When brakes are applied the brake shoes will press against the:

  1. Slack adjuster.
  2. Brake drum or disk - 正确答案
  3. S-cam
  4. None of these answers are correct

当刹车时，刹车片将压在刹车鼓或刹车盘上

In ideal conditions, a truck or bus with an air brake going at 55 mph would require stopping distance of ___, How many feet?

  1. From 100 to 300 feet
  2. Less than 100 feet
  3. More than 300 feet - 正确答案
  4. Less than 150 feet

在理想条件下，配备有气刹的卡车或巴士以55 mph(每小时英里)的速度刹车时，将需要300英尺以上的刹车距离

With air brake vehicles, the parking brakes should be used:

  1. None of these answers are correct
  2. To hold your speed when going downhill
  3. As little as possible
  4. Any time when the vehicle is parked - 正确答案

对于带气刹系统的车辆，停车时应随时使用驻车(泊车)刹车

An air brake system is fully charged at what PSI?

  1. 115
  2. 75
  3. 120
  4. 125 - 正确答案

空气刹车系统在125 PSI(每平方英寸压力)时为充满气

Your truck has a dual air system and one of the system loses its pressure. What will happen?

  1. Either the front or back brake will not be fully operational - 正确答案
  2. Brake drums will not be fully pressurized.
  3. The manual slack adjusters of the S-cam brakes will not be set properly
  4. None of these answers are correct

你的卡车具有双气刹系统，如果其中一个系统失去压力，这时前制刹车器或后刹车器将无法完全操作

The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:

  1. Spring pressure - 正确答案
  2. Air pressure
  3. None of these answers are correct
  4. Hydraulic pressure

重型车辆上的泊车或紧急刹车器只能通过诸如弹簧压力之类不能泄漏的东西保持在原位

If you must make an emergency stop, you should brake so you:

  1. Can steer and so your vehicle stays in a straight line. - 正确答案
  2. Use the full power of the brakes to lock them
  3. None of these answers are correct
  4. Use the hand brake before the brake pedal

如果必须紧急停车，则应刹车以便转向，使车辆保持在一条直线上。

Some air brake systems have an alcohol evaporator. What may happen if you don't keep the proper level of am alcohol?

  1. None of these answer are correct
  2. Ice may form in the air storage tank and cause a brake failure - 正确答案
  3. Ice may form on the brake drums and wear them out
  4. The S-cam may not take back when you release the brake pedal

一些气压刹车系统具有酒精蒸发器。 如果你没有保持适当的酒精，可能会在储气罐中形成冰块并导致刹车故障/失灵。

The braking power of spring brakes:

  1. Increases when the service brakes are hot
  2. Is not affected by the condition of the service brake
  3. Depends on the adjustment of the service brakes. - 正确答案
  4. None of these answer are correct

弹簧刹车器的刹车力取决于行车(服务)刹车器的调节

Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?

  1. None of these answers are correct
  2. Reduce your speed, and test the remaining system while under way.
  3. Stop right away and safely park, Continue only after the system is fixed. - 正确答案
  4. Reduce your speed and drive to the nearest garage for repairs.

你的卡车或客车具有双气压刹车系统。 如果仅一个系统出现低气压警告，则应立即在安全情况下停下来，仅在系统修复后才可以继续上路。

If air pressure is not built up within the correct amount of time, then:

  1. None of these answers are correct
  2. You should be ready to use your parking brakes to stop.
  3. The alcohol container may be low
  4. Your air pressure may drop to a low point while driving, requiring an emergency stop. - 正确答案

如果未在正确的时间内建立气压，则行驶时气压可能会降低至较低点，这时候需要在安全的情况下紧急停车。

Why drain water from compressed air tanks?

  1. None of these answers are correct
  2. Water low boiling point reduces braking power
  3. Water can freeze in cold weather and cause brake failure - 正确答案
  4. Water cools the compressor too much

你应该定期的排出压缩空气罐中的水。 因为水在寒冷的天气会结冰并导致刹车故障

The use of brakes on a long and steep downgrade under normal conditions is only a supplement to:

  1. None of these answers are correct
  2. The braking effect of the engine - 正确答案
  3. Use of spring brakes
  4. The use of the front brakes limiting valve

在正常情况下，车辆在长时间下坡情况下，使用刹车器只是对发动机刹车效果的辅助

To check the free play of manual slack adjusters of S-cam brakes, you should park on:

  1. Level ground and drain off air pressure before checking the adjustment.
  2. Level ground and apply the parking brakes, then apply service brakes.
  3. None of these answers are correct
  4. Level ground, chock the wheels and release the parking brakes. - 正确答案

要检查S型凸轮刹车器上的手动松紧调节器的自由活动间距，应将车辆停在水平地面上，用东西顶住车轮防止滑动，然后松开泊车刹车器。

商业车驾照气刹理论模拟考试