Air Brakes CDL Practice Test - Arizona
11.
Before starting down a hill, you should slow down and shift down:
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so you can coast downhill.
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to a gear that will cause your engine to exceed its redline.
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to a speed that you can control without using the brakes hard.
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12.
After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
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shutting the engine off so you can hear the brakes.
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applying and releasing the trailer brakes and listening for the sound of trailer brakes.
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All of the above.
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13.
Banked curves:
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should always be avoided.
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have a safe "design speed".
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can be taken at any speed.
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14.
You supply air to the trailer brake system by:
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pushing in the trailer air supply knob.
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connecting the tractor service air line to the trailer service glad hand.
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plugging the electrical cord into the trailer.
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15.
To make the brakes work, air brakes use:
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nitrogen.
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compressed air.
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hydraulic air.
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