AIR BRAKES CDL PRACTICE TEST - TENNESSEE
16.
In a dual-air system - with engine at operating RPM, the pressure should build from 85 to 100 psi within how many seconds?
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20
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12
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60
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45
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17.
If a vehicle is equipped with ABS, when you start the engine:
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the trailer emergency brakes will come on.
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the ABS indicator light on the dash should come on and then turn off.
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the wheels will lock up.
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the spring brakes will come on.
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18.
In vehicles with air brakes, the brake pedal:
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pumps air into the air storage
tanks.
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tells you how much pressure is in
the air tanks.
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let the
air out of the spring brakes.
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controls the air pressure applied to the brakes.
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19.
The posted speed limit:
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should never be exceeded.
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should only be exceeded when passing other vehicles.
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is only a suggestion.
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may only be exceeded when driving in rural areas.
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20.
Brake lag is:
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the distance your vehicle will travel, in ideal conditions, while you are braking.
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the amount of air pressure required to stop the vehicle.
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the distance your vehicle will continue to travel, in ideal conditions, before you hit the brakes.
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the time required for the air brakes to work after the brake pedal is pushed.
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