GEORGIA CDL COMBINATION PRACTICE TEST
11.
When the trailer breaks away or develops a bad leak, the tractor protection valve will close automatically and:
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the trailer supply valve will stay open.
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the engine will shut down.
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the trailer emergency brakes will come on.
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the tractor will lose all air pressure.
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12.
When driving in a construction zone, if a construction worker is near the road, you should:
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speed up.
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further reduce your speed.
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maintain a constant speed.
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come to a complete stop.
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13.
When backing a trailer, you should:
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turn the steering wheel toward the direction you want to go.
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pull-up frequently to reposition the vehicle.
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not back up in a straight line.
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avoid braking.
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14.
When you get ready to back under the semi-trailer, you should:
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back under the trailer at an angle to avoid pushing the trailer sideways.
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line up the kingpin to engage the driver's side locking jaw first.
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line up directly in front of the trailer.
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line up about 15 degrees off the line of the trailer.
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15.
The first thing to do when coupling a tractor-semitrailer is to:
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position the tractor.
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lock the trailer brakes.
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inspect the fifth wheel.
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check the trailer height.
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16.
When driving on slippery roads, you should NOT:
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watch far enough ahead to keep a steady speed.
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use the engine brake.
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go slowly.
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try to anticipate stops early.
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17.
Most hydraulic brake failures occur for one of two reasons, one of which is:
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driving in cold weather.
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loss of hydraulic pressure.
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relying too much on the engine braking effect.
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excessive downshifting.
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18.
When more cargo is piled up in a truck, the center of gravity moves:
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to the left side of the truck.
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closer to the ground.
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higher up from the road.
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to the right side of the truck.
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19.
Older trailers do not have spring brakes. If the air supply leaks away:
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there will be no emergency brakes.
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the ABS won't work properly.
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the trailer will stop normally.
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All of the above.
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20.
What is the emergency air line for?
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It supplies air to the trailer air tanks, and controls the emergency brakes on combination vehicles.
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It controls the front brakes of the tractor in case of an emergency.
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It tells you the amount of brake pressure you need to stop the vehicle.
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All of the above.
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