Truck Test 8

1.What keeps the air in the tanks if the air compressor develops a leak?

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2.The distance the ______ of the foot valve is depressed by the driver determines the air pressure that will be applied in order to operate the brakes.

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3.A foot valve ______________.

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4.If compressed air of 120 psi acts on a diaphragm of 45 square inches, how much force is produce?

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5.Which of the following is a circular container divided in the middle by a flexible diaphragm?

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6.Levers and air pressure give brakes:

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7.Most brake linings work best around:

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8.To stop a vehicle in 1/10 the time it took to accelerate would require a stopping force of __ times the acceleration force.

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9.The time it takes from the moment a hazard is recognized to the time the brake is applied is known as:

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10.All compressor reservoirs must be drained ______, in order to avoid excess water collection.

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11.A manual front brake limiting valve is useful in what type of conditions?

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12.Which of the following uses air pressure to assist brake force but does not require an air brake endorsement on your licence in order to operate?

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13.What component of an air brake system prevents air from moving backwards in the system toward the compressor?

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14.The braking force required to stop a vehicle varies directly with its _______________.

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15.What part can be installed on long wheel base vehicles to allow the brakes to release quickly and fully by discharging the application air near the brake chambers?

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16.The compressor must be able to build reservoir air pressure from _______ within three minutes, otherwise the compressor requires servicing.

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17.What is the cause of accumulated sludge at the bottom of a reservoir?

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18.When the driver releases the foot valve treadle and the air in the brake chambers is allowed to exhaust through the ______, releasing the brakes.

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19.If an air brake system's compressor is struggling to build 90 psi of air pressure within 3 minutes, which of the following is most likely the problem?

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20.Braking at highway speed causes brake drum _______ due to heat, which in turn requires _____ push rod travel to maintain the same braking force.

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21.A reservoir's safety valve is normally set at ______.

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22.What type of brake assembly uses a 'power screw'?

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23.Which of the following can result in a brake system's automatic slack adjuster not maintaining proper slack?

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24.When a manual front brake limiting valve is activated, when applying air pressure to the front brakes it is reduced to __ percent of the application air pressure being delivered to the rear brake chambers.

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25.Which of the following controls the minimum and maximum air pressure in the air brake system by controlling when the compressor pumps air?

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26.A spring parking brake system can also act as ____________.

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27.In a spring parking brake system, the brakes are applied by _____ pressure and retracted by ______ pressure.

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28.The first reservoir after the compressor is known as the __________.

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29.Brake chambers and slack adjusters ______________________.

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30.The foot valve is usually located closer to the ________. The longer the distance from the foot valve to the rear chambers, the ______ time it will take before the rear brakes apply.

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31.The force that resists movement between two surfaces in contact with each other:

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32.When a brake diaphragm chamber bottoms out, the force reduces to ____.

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33.When connecting the glad hands, start with the two gaskets together and the couplers at a ___ angle to each other.

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34.What are the two types of trailer supply valves? Choose the best answer.

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35.In regards to a dual air brake system, air taken from primary and secondary circuits through a two-way check valve is known as _________.

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36.Which of the following negatively affects braking ability?

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37.The effectiveness of diaphragm brake chambers drops off significantly if the stroke exceeds __% of its designed travel.

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38.Which of the following is capable of directing air flow into a common line from either of the foot valve or the hand valve?

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39.On vehicles equipped with ______ brakes it is possible to pump the brake pedal to compensate for brakes that are out of adjustment. This is not possible with a vehicle equipped with ___________ brakes.

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40.___________ prevents total loss of air from the tractor if the trailer breaks away, or if the connecting airlines between tractor and trailer become separated or ruptured.

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41.Which of the following is true in the case that there is air loss in one of the dual air brake system's circuits?

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42.___________ must not be used to hold a parked vehicle that is left unattended. Loss of pressure will result in loss of brakes. Always set the __________.

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43.$What would happen if a trailer that is not equipped with spring parking brakes were to separate from the tractor?

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44.If a relay emergency valve is mounted on the trailer reservoir and a loss of air pressure from the power unit service system occurs, what will automatically happen?

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45.Which of the following is another term for a control (service) line?

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