AIR BRAKES CDL PRACTICE TEST - TENNESSEE
21.
Do NOT use the parking brakes:
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to test that they work.
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when you park for less than two hours.
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when you leave your vehicle.
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if the brakes are very hot.
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22.
When the air system is fully-charged, the air loss rate for a single vehicle with the engine off should be less than:
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2 psi in 30 seconds.
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2 psi in one minute.
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4 psi in one minute.
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3 psi in one minute.
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23.
If you are driving a 30-foot vehicle at 55 mph, you should leave at least _____ between you and the vehicle ahead.
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3 seconds
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2 seconds
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4 seconds
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5 seconds
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24.
Hydroplaning is more likely if:
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the road is wet.
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tire tread is worn.
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tire pressure is low.
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All of the above.
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25.
When you make a quick lane change, the crack-the-whip effect can:
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improve your traction.
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turn the trailer over.
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make it harder to turn without skidding.
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the trailer to swing wide to the left.
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