COMBINATION PRACTICE TEST - AR CDL
11.
The best way to test the trailer service brakes is to:
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accelerate to the maximum possible speed, then apply the trailer brakes fully.
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put the handbrake on when there are no vehicles around you.
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pull forward quickly, then apply the trailer brakes with your hand control.
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None of the above.
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12.
If you cannot make a right turn without entering another traffic lane, you should:
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watch out for vehicles coming toward you and back up for them.
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swing wide to the left before starting the turn.
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turn wide before you start the turn.
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turn wide as you complete the turn.
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13.
When the ______ closes, it stops any air from going out of the tractor.
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hand valve
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tractor protection valve
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height control valve
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alcohol evaporator
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14.
Before connecting the converter dolly to the rear trailer, make sure that:
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the shut-off valves at the rear of the first trailer are open.
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the trailer height is slightly lower than the center of the fifth-wheel.
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the locking jaws rest on the kingpin.
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the kingpin rests on the fifth-wheel.
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15.
Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
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100 psi
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50 psi
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150 psi
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35 psi
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16.
The person watching the loading or unloading of a cargo tank must be within _______ of the tank.
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15 feet
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25 feet
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50 feet
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5 feet
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17.
If you're feeling tired while driving you should:
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stop driving and get some rest.
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increase your speed to get to your destination quicker.
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eat something.
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drink coffee.
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18.
Which of these statements about brakes is true?
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Brake fade does not result from excessive heat.
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The lighter the vehicle, the more heat the brakes absorb to stop it.
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To stop, the brake shoes and linings are pushed against the outside of the drum.
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None of the above.
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19.
Which of the following is NOT part of testing the trailer service brakes?
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Pushing in the trailer air supply knob.
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Checking for normal air pressure.
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Moving the vehicle forward slowly.
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Releasing the parking brakes.
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20.
The wheels of a large combination vehicle are more likely to lock up when:
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you are traveling in very hot weather.
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the trailer has new tires.
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the vehicle is lightly loaded.
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the vehicle is heavily loaded.
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