CDL DOUBLES TRIPLES PRACTICE TEST LOUISIANA
11.
When coupling a double or triple, ________ should be attached last.
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the more heavily loaded trailer.
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the trailer right behind the cab.
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the middle trailer.
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None of the above.
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12.
Air pressure should build up in a single air system, within about:
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10 minutes.
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1 minute.
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3 minutes.
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15 minutes.
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13.
By pushing the trailer air supply control knob in, you:
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supply the tires with air.
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shut the air off and put on the trailer emergency brakes.
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keeps air in the tractor or truck brake system.
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supply the trailer with air.
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14.
Before each trip, you must make sure:
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the truck is overloaded.
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the cargo is balanced and secured.
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your cargo obscures your view to the sides.
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the cargo has a high center of gravity.
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15.
Which of the following is not a braking system on a truck?
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Parking brake
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Service brake
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Emergency brake
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Steering brake
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16.
In vehicles with air brakes, the two markings on a front brake limiting valve are:
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normal and slippery.
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wet and dry.
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left and right.
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high and low.
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17.
Texting while operating a commercial motor vehicle is:
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acceptable if you are contacting your dispacther.
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acceptable if you are contacting your supervisor.
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illegal.
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only allowed at night.
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18.
Enough tread is especially important in winter conditions. You need at least ________ tread depth on steering axle tires.
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6/24 inch
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8/32 inch
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2/8 inch
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4/32 inch
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19.
The service line is also called:
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power line.
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brake line.
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cable line.
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control line.
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20.
If you are caught in strong winds, you should:
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keep a strong grip on the steering wheel and slow down or pull off the roadway.
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speed up while keeping a strong grip on the steering wheel.
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immediately take your foot off the accelerator.
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None of the above.
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