CDL DOUBLES PRACTICE TEST UTAH
11.
When trying to put out an electrical fire you should:
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use an A extinguisher.
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use an D extinguisher.
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use a B or C extinguisher.
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use water.
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12.
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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13.
Which of the following is NOT true?
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ABS only comes into play when a wheel would have locked up because of over braking.
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ABS will change the way you normally brake.
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ABS won't compensate for bad brakes.
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ABS won't compensate for poor brake maintenance.
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14.
When your vehicle starts to skid, you must take action to:
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restore traction to the tires.
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use controlled braking.
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use stab braking.
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accelerate and countersteer.
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15.
When driving double and triple trailers, drivers should:
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steer gently and go slowly around corners.
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allow more following distance.
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look far ahead.
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All of the above.
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16.
When backing a trailer, you should turn the steering wheel to the right to make the trailer go left (or vice versa). Once the trailer starts to turn, you should:
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turn the wheel the other way to follow the trailer.
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turn the wheel more in the direction you want to go.
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keep backing up.
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None of the above.
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17.
Which of the following statements about backing heavy vehicles is true?
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The helper should stand where you cannot see the helper.
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Always back as quickly as possible.
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Back to the right side so that you can see better.
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You should avoid backing whenever you can.
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18.
You should always adjust your speed to be able to stop within:
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the distance you can see ahead.
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the length of your vehicle.
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50 feet.
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30 feet.
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19.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
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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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You may not notice a major leak in the service line until you try to put the brakes on.
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The air could leak out of the trailer air tank, releasing its emergency brakes.
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None of the above.
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20.
Hanging meat in a refrigerated truck can be:
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a very stable load with a low center of gravity.
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a very unstable load with a high center of gravity.
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a very unstable load with a low center of gravity.
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a very stable load if properly distributed.
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