AIR BRAKES PRACTICE TEST - INDIANA
16.
Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
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less; less
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greater; more
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less; more
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greater; less
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17.
When checking air brakes on combination vehicles, which of the following is NOT part of checking that air flows to all trailers?
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Opening the emergency line shut-off valve at the rear of the last trailer.
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Using the trailer handbrake to provide air to the service line.
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Pulling tractor forward until the fifth-wheel comes out from under the trailer.
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Going to the rear of the rig.
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18.
In a vehicle with a dual air brake system:
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one system supplies air to the trailer.
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both systems typically operate the regular brakes on the rear axle.
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each system has its own air tanks.
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All of the above.
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19.
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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20.
To test the low pressure warning signal, you should:
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manually let the air out of your brakes and see if the signal comes on.
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pump the brakes while your vehicle is running.
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check the air hoses connected to the brake chambers to make sure they aren't cut.
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shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal until the low air pressure warning signal comes on.
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