CDL AIR BRAKES PRACTICE TEST - ILLINOIS
6.
The trailer hand valve should:
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be used in driving.
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never be used for parking.
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never be used to test the trailer brakes.
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All of the above.
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7.
Before driving a vehicle with a dual air system, the air compressor should build up a minimum of _____ pressure in both the primary and secondary systems.
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10 psi
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50 psi
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100 psi
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75 psi
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8.
When is it safe to leave your vehicle unattended without applying the parking brakes or chocking the wheels?
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When the tank pressure falls to the "cut-in" pressure.
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Only while you are taking a rest break.
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Never.
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When you are conducting your pre-trip inspection.
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9.
Under a pressurized system, the radiator cap:
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should never be hot.
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should never be removed until the system has cooled.
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should be removed when the coolant is hot.
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should always be cool.
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10.
Parking brakes are:
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required on all vehicles.
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not required on trailers.
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not required on commercial vehicles with air brakes.
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not required on buses.
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