GEORGIA CDL AIR BRAKES PRACTICE TEST
21.
Passive railroad crossings:
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usually have a person directing traffic.
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should never be crossed using a CMV.
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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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22.
Radial and bias-ply tires:
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should be used together.
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should be used together only when driving in packed snow.
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should be used together only during bad weather.
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should not be used together.
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23.
Brake fade results from:
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excessive speeding.
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excessive wear.
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excessive use of the service brakes.
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excessive smoke.
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24.
In some vehicles a modulating control valve may be used to:
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apply the parking brake.
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apply the front brakes.
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apply the spring brakes gradually.
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decrease the pressure in the brake system.
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25.
Most heavy vehicles require ________ change gears.
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single clutching
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double shifting
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double clutching
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triple shifting
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