CDL AIR BRAKES PRACTICE TEST - NEW HAMPSHIRE
16.
With the air pressure built up to governor cutoff, the maximum leakage rates per minute after the initial pressure drop are:
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3 psi for single vehicles and 4 psi for a combination of 2 vehicles.
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1 psi for single vehicles and 2 psi for a combination of 2 vehicles.
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4 psi for single vehicles and 2 psi for a combination of 2 vehicles.
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5 psi for single vehicles and 6 psi for a combination of 2 vehicles.
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17.
The low air pressure warning light is usually:
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blue.
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red.
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orange.
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yellow.
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18.
The safety relief valve is usually set to open at ____ psi.
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50
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150
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75
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100
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19.
The heavier the vehicle:
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the more work the brakes must do to stop it.
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the less work the brakes must do to stop it.
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the higher the center of gravity will be.
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None of the above.
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20.
The tractor protection valve:
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will close automatically if the air pressure drops to a certain level.
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will close if you apply the parking brakes.
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provides the air supply for the brake system.
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All of the above.
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