AIR BRAKES CDL PRACTICE TEST - NEW YORK
21.
The parking or emergency brakes of trucks or buses must be held on by:
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air pressure.
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fluid pressure.
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hydraulic pressure.
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spring pressure.
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22.
Supply pressure gauges tell you:
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when the air pressure in the tanks falls below 60 psi.
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how much pressure is in the air tanks.
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when the pressure in the system drops below 60 psi.
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how much air pressure you are applying to the brakes.
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23.
To test the air leakage rate, with a fully-charged air system you should ____________ and time the air pressure drop.
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release the parking brake, leave the engine running
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check the air compressor's drive belt, chock the wheels
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turn off the engine, release the parking brake
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put alcohol into the air system, run the engine at a fast idle
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24.
Spring brakes:
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will apply the brakes when a leak in the air brake system causes all the air to be lost.
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are usually held back by air pressure.
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will come fully on when air pressure drops to a certain range, typically 20 to 30 psi.
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All of the above.
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25.
If your trucks has a high center of gravity, which of the following is true for curves?
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You should travel at the posted speed limit.
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Reduce your speed to a crawl.
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You should slow down, as your truck can roll over at the posted speed limit for the curve.
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None of the above.
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