AIR BRAKES PRACTICE TEST - SOUTH CAROLINA
6.
Rough acceleration:
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can cause mechanical damage.
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improves gas mileage.
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is recommended during long trips.
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is necessary to warm up the engine.
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7.
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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8.
You should NOT use the parking brakes if:
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the brakes are very hot.
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the brakes are too dry.
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the brakes are cold.
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All of the above.
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9.
If you must make an emergency stop, you should:
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apply the brakes as hard as you can to lock them.
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use the hand brake before the brake pedal.
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brake in a way that will keep your vehicle in a straight line.
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None of the above.
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10.
In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
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20 to 45 psi
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100 to 120 psi
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50 to 75 psi
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10 to 20 psi
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