CDL Air Brakes Practice Test - Utah
21.
Rough acceleration:
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is necessary to warm up the engine.
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is recommended during long trips.
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can cause mechanical damage.
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improves gas mileage.
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22.
The service brake applies and releases:
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the parking brake when you use the parking brake control.
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the brake in an emergency situation.
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the brake when you use the brake pedal during normal driving.
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None of the above.
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23.
When you push the brake pedal down, air brakes work:
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immediately.
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only when ABS is working.
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after a short delay.
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after about 15 seconds.
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24.
Passive railroad crossings:
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have at least one traffic control device.
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do not have traffic control devices.
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should never be crossed using a CMV.
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usually have a person directing traffic.
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25.
If the air tanks are not drained:
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the water can freeze in cold
weather and cause brake failure.
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the spring brakes will come on.
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your speed must be reduced to 5 MPH below your “safe” speed.
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the air pressure in the tanks is reduced.
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