GENERAL KNOWLEDGE CDL TEST LOUISIANA - PRACTICE TEST
11.
Vehicle inspections:
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are not required for trips under 50 miles.
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are required once a month.
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should only be performed by a certified mechanic.
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are required by state and federal law.
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12.
When you double your speed from 20 to 40 mph, the braking distance:
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is 4 times longer.
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stays about the same.
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doubles.
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increases slightly.
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13.
Blocking and bracing are:
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used to keep cargo from sliding and to prevent movement of cargo.
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driving techniques used to regain control when your drive wheels start to skid.
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coupling devices used to connect the service air lines from the truck or tractor to the trailer.
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None of the above.
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14.
Use your four-way emergency flashers:
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when stopping at railroad highway crossings.
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to warn drivers behind you that people are working on the road.
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when parked at the side of the road.
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All of the above.
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15.
Strong winds can make it difficult to stay in your lane especially when driving:
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lighter vehicles.
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flatbed trailers.
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heavier vehicles.
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vehicles with ABS.
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16.
Before driving a vehicle with a dual air system, allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
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100 psi
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75 psi
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25 psi
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50 psi
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17.
Air brakes:
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can improve fuel efficiency.
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are prohibited on larger vehicles.
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should be used only when driving on wet roads.
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are an effective way to stop large and heavy vehicles.
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18.
Driving in very hot weather:
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can decrease oil pressure.
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should never be done.
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can increase tire pressure.
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can make it difficult to stay in your lane.
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19.
When going down long, steep downgrades, you should:
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try not to use the brakes.
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downshifting and then use the brakes.
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rely solely on engine braking to reduce your speed.
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only use the brakes.
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20.
To test the service brake:
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gently try to pull forward with the trailer parking brake on, then release the brake.
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push the brake pedal firmly while slowly moving backward.
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shift your transmission to a low gear, pump the brake pedal three times, then hold it down for five seconds.
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push the brake pedal firmly while going about 5 mph.
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