COMBINATION TEST LOUISIANA - PRACTICE TEST
11.
How many red reflective triangles should you carry?
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5
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6
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3
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2
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12.
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 tractor will lose all air pressure.
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the engine will shut down.
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the trailer emergency brakes will come on.
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13.
Banked curves:
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should always be avoided.
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have a safe "design speed".
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are reserved for pedestrians.
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can be taken at any speed.
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14.
If a drawbridge does not have a signal light or traffic control attendant, you should:
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drive through the drawbridge with caution.
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stop and look to make sure the draw is completely closed before crossing.
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stop at least 5 feet before the draw of the bridge.
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get through the drawbridge as quickly as possible.
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15.
Do not use the trailer hand valve in driving because:
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the trailer emergency brakes will come on.
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of the danger of making the trailer skid.
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the brakes can overheat and lose their braking power.
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All of the above.
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16.
If you let air out of hot tires:
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as the tire cools, the air pressure will be too low.
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air pressure will increases, causing the tires to blow out.
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the tires will cool off much sooner.
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None of the above.
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17.
At night, when the load on a vehicle extends 4 feet or more beyond the rear of the body, there must be _______ at the end of the load.
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2 red flags
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a fluorescent orange flag
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2 lit red lights
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All of the above.
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18.
When inspecting the coupling, make sure the fifth-wheel jaws have closed around the:
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the brake camshaft.
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head of the kingpin.
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the electrical cord.
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shank of the kingpin.
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19.
Weight that is loaded so there is a high center of gravity:
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makes a vehicle easier to handle.
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causes greater chance of rollover.
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reduces the chance that the load will shift to the side or fall off.
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All of the above.
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20.
You are checking the tractor-trailer connection to make sure it is safe and secure. The landing gear should be:
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raised slightly off the ground.
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fully lowered.
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fully raised.
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None of the above.
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