UT CDL AIR BRAKES PRACTICE TEST
6.
Why must air tanks be drained?
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Water and
oil reduce the air pressure.
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Water can freeze in cold weather and cause brake failure.
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The low boiling point of water reduces braking power.
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To keep from fouling the air compressor oil.
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7.
After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
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applying and releasing the trailer brakes and listening for the sound of trailer brakes.
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shutting the engine off so you can hear the brakes.
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checking the air brake system pressure gauge for signs of major air loss.
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All of the above.
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8.
Why should you check your mirrors regularly to know where other vehicles are around you?
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To flash the brake lights if you are being tailgated.
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To know whether you can make a quick lane change in an emergency.
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To move out of their way if they want to get past.
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To better assess your own speed.
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9.
If your vehicle is hydroplaning, you should:
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release the accelerator and push in the clutch.
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use the brakes to slow down.
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accelerate to get through the water as quickly as possible.
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None of the above.
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10.
Supply pressure gauges tell drivers:
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how much pressure is in the air tanks.
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how much air pressure they are applying to the brakes.
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how much pressure the relay valves should send to the trailer brakes.
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All of the above.
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