Air Brakes Practice Test - North Carolina
16.
When you release the brake pedal, the _____ rotates back and a spring pulls the brake shoes away from the drum.
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hydraulic brake system
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pressure gauge
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air compressor belt
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S-cam
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17.
The air compressor stops pumping air into the air storage tanks when air tank pressure rises to around:
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125 psi.
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450 psi.
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100 psi.
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250 psi.
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18.
The safety relief valve is located:
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on the dashboard.
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in the front brake.
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in the first tank the air compressor pumps air to.
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on each end of the vehicle's axles.
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19.
Under a pressurized system, the radiator cap:
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should always be cool.
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should be removed when the coolant is hot.
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should never be removed until the system has cooled.
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should never be hot.
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20.
Most heavy vehicles require ________ change gears.
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single clutching
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double clutching
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double shifting
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triple shifting
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