COMBINATION TEST WISCONSIN - PRACTICE TEST
11.
When coupling a tractor to a semi-trailer, after checking if the fifth-wheel is in proper position for coupling you should:
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connect the electrical cord and check the air lines.
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make sure the area around the vehicle is clear and the trailer wheels are chocked.
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secure the vehicle.
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connect the air lines to the trailer.
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12.
For a cargo fire in a box trailer, you should:
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wait 10 minutes before opening the doors.
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open the doors immediately and use the fire extinguisher.
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use the fire extinguisher on the doors.
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keep the doors shut.
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13.
What is a tractor jackknife?
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When a drive-wheel skid lets the trailer push the towing vehicle sideways.
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When the wheels of a trailer lock up, and the trailer swings around.
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When the rear wheels of a trailer lock up, and the tractor swings around.
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None of the above.
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14.
If you feel drowsy while driving, what should you do?
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Get an energy drink.
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Pull off the road and get some sleep.
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Turn on the radio to keep you awake.
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Eat heavy foods.
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15.
If the ABS is not working:
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the vehicle will have no brakes.
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the vehicle will have weak brakes.
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you still have normal brake functions.
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None of the above.
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16.
Your vehicle has hydraulic brakes. When you press the brake pedal while driving and the pedal goes to the floor, remember that:
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the parking brake should never used to slow the vehicle.
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pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.
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shifting into neutral may help slow the vehicle.
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All of the above.
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17.
Radial and bias-ply tires:
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should be used together.
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should be used together only during bad weather.
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should be used together only when driving in packed snow.
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should not be used together.
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18.
In a vehicle with a dual air brake system:
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each system has its own air tanks.
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both systems typically operate the regular brakes on the rear axle.
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one system supplies air to the trailer.
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All of the above.
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19.
In vehicles with air brakes, the tractor protection valve:
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is used to connect the service and emergency air lines from the truck/tractor to the trailer.
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keeps air in the tractor or truck brake system.
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carries air, which is controlled by the trailer hand brake or the foot brake.
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provides the air pressure used to operate trailer brakes.
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20.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
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The air could leak out of the trailer air tank, releasing its emergency brakes.
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You may not notice a major leak in the service line until you try to put the brakes on.
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if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
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None of the above.
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