Truck Test 4

1.An ABS system keeps the wheel from skidding and increases vehicle stability and control during what type of conditions?

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2.If the air pressure drops to a range between ______ psi, the trailer supply valve will close automatically by spring pressure, opening the exhaust port.

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3.With automatic traction control, __________ is activated when the system detects a wheel slipping because the wheels operating on different surfaces such as one wheel on dry pavement and the other on the ice.

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4.Which of the following is responsible for preventing automatic spring brake application if the trailer supply line has a gradual leak?

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5.Which of the following is a term that refers to the coupling device used to connect the control (service) and supply (emergency) lines of the trailer to the tractor?

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6.Which of the following can a tractor with a dual air brake and spring parking brakes system tow?

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7.A tractor protection valve is normally located near the _________.

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8.What system reduces the potential of powering into a jackknife caused by wheel overspin during acceleration?

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9.Caging a spring parking brake is the same as...

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10.Which of the following negatively affect braking ability?

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11.Which of the following is a disadvantage of a control (service) line and foot and hand valve system?

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12.A/n _______ is an electronic system that monitors wheel speed at all times and controls wheel speed while braking

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13.Tractors and trailers _______ ABS can be connected to one another without affecting the operation of the ABS.

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14.If the foot valve is supplying a higher application pressure than the hand valve, a two-way check valve will allow air flow from which source?

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15.On the pre-trip air brake inspection, you must ensure that the parking brake spring is not _______ or it will not expand and apply the brake.

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16.Which of the following is true of a basic dual air brake system?

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17.One gram is equal to how many ounces?

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18.What should be done to parked trailers without spring parking brakes to prevent a possible runaway?

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19.What protects the wet reservoir from becoming over pressurized?

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20.In an air-boost hydraulic brake system what is used to intensify the hydraulic pressure generated by the master cylinder?

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21.When inspecting brake adjustment on a single unit, the slack (pushrod travel) should be within how many inches within the manufacturer's specifications?

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22.One metre is equal to how many yards?

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23.At the first stop after adjusting the wedge type brakes, check each brake drum or rotor for temperature. An extra _______ brake drum indicates that you have _____ adjusted it.

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24.What is the upward motion of the piston that compresses the air in the cylinder known as?

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25.What would be the psi if 50 pounds were being forced onto 2 square inches?

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26.Choose the correct order of steps to secure a vehicle as part of a single unit pre-trip air brake inspection.

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27.What is used to mark where the push rod enters the brake chamber when determining whether an S-cam brake with manual slack adjusters requires adjustment?

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28.How often do automatic slack adjusters need to?

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29.Which of the following vehicles would require checking the hydraulic fluid level in the reservoir as part of the pre-trip check?

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30.For a combination unit, during what part of the pre-trip check do you ensure that the air brake glad hands and trailer electrical cord is connected properly?

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31.After a long mountain drive, what is the best way to park if your vehicle has spring parking brakes?

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32.Which of the following does not usually have a pressure gauge?

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33.When conducting a compressor and warning device check for a single unit, warning device(s) must operate to __ psi or higher

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34.During the '_______' stage, the compressor is able to cool.

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35.If an air-actuated hydraulic brake system was to lose its air supply, the vehicle would have no service brakes. Only the __________ would be operating.

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36.For a combination unit, during what part of the pre-trip check do you ensure that the reservoir air pressure builds from 50 to 90 psi within three minutes?

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37.Discounting self-lubricated compressors, how are compressors usually lubricated?

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38.Can the trailer brake hand valve be used for parking?

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39.Choose the correct order of steps for the compressor and warning devices check as part of a single unit pre-trip air brake inspection.

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40.One kilogram is equal to how many pounds?

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41.An air dryer may be installed between the ________ and the ________ to help remove moisture from the compressed air.

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42.What does the acronym psi stand for?

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43.If a brake is out of adjustment and there is not enough reserve stroke of the push rod travel to compensate for drum expansion, this will cause ________.

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44.When checking for reservoir air leakage for a single unit, after making a full brake application with the foot valve and holding it the air pressure gauge reading should not drop more than __ psi per minute.

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45.In a dual air brake system, if one circuit develops a leak, the other circuit would be protected from air pressure loss by the __________________.

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