CDL DOUBLES TRIPLES PRACTICE TEST MISSOURI
11.
To prevent rollover, you should:
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put the lightest parts of the cargo under the heaviest parts.
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place the cargo near the rear of the trailer.
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keep the cargo as close to the ground as possible.
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12.
By pushing the trailer air supply control knob in, you:
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supply the trailer with air.
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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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13.
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 trailer emergency brakes will come on.
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14.
Hanging meat in a refrigerated truck:
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can be a very unstable load.
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should never be transported.
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will not affect safe driving ability.
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15.
If your trailer starts to skid, you should:
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release the brakes.
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steer in the opposite direction.
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pump the brakes.
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16.
After an accident, an improper use of flares could cause:
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a fire if spilled fuel is on the ground.
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the springs to put on the brakes.
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air pressure to build from 50 to 100 psi within 2 minutes.
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17.
If a tire fails while you are driving, you should:
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stay off the brake
until your vehicle has slowed down.
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stop on the roadway if possible.
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call your supervisor for instructions.
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18.
Blocking is used to:
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protect the cargo from weather.
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keep the cargo from sliding.
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protect people from spilled cargo.
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19.
Which of the following may have reduced the clearances since the heights were posted at bridges and overpasses?
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The weight of a cargo
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Rain
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Repaving of the road
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20.
Emergency lines are often coded with the color ___ to keep from getting them mixed up with the service line.
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blue.
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yellow.
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red.
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