MN CDL AIR BRAKES PRACTICE TEST
11.
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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12.
With the controlled braking method, you:
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push down on the brake pedal as hard as you can so that the wheels the lock up.
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apply the brakes as hard as you can without locking the wheels.
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apply the brakes all the way and release brakes when the wheels the lock up.
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None of the above.
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13.
How do you check that spring brakes come on automatically?
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On single vehicles, continue to step on and off the brake pedal until the parking brake valve pops out.
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Continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
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On a tractor-trailer combination vehicle, continue to step on and off the brake pedal until the tractor protection valve and the parking brake valve close.
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All of the above.
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14.
While driving, you should use your mirrors to:
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check the condition of the tires and cargo.
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check where the rear of your vehicle is while you make turns.
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know where other vehicles are around you.
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All of the above.
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15.
On any upgrade, gravity:
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doesn't affect your speed.
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speed you up.
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slows you down.
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doubles your speed.
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