CDL DOUBLES TRIPLES PRACTICE TEST NEW MEXICO
11.
When driving at night you should dim your lights when following another vehicle within:
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100 feet.
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1 mile.
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500 feet.
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12.
If you unlock the pintle hook with the dolly still under the rear trailer:
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the dolly tow bar may fly up.
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your vehicle might roll away.
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the brakes could be damaged by the combined forces of the springs and the air pressure.
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13.
When trying to put out an electrical fire you should:
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use a B or C extinguisher.
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use an D extinguisher.
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use an A extinguisher.
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14.
Before driving a vehicle with a dual brake brake system, the driver should:
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allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems.
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wait at least 10 minutes before driving.
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pump the brake pedal 10 times to build pressure.
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15.
Another name for front-end header boards is:
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headache racks.
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head belt.
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containerized racks.
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16.
If a load is 50 feet long, the minimum number of tie-downs required is:
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10
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5
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4
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17.
When making a turn you should:
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honk your horn.
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make gestures to get the attention of other drivers.
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signal early.
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18.
If your vehicle is equipped with air brakes, loss of air pressure in the emergency line will cause:
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the trailer emergency brakes to come on.
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the vehicle to slide back and forth.
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the springs to put on the brakes.
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19.
When driving with more than one trailer, the _______ trailer should be the first one behind the tractor.
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heaviest
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lightest
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shortest
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20.
When more than one semitrailer is behind the tractor:
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The order doesn't matter.
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the more heavily loaded semitrailer should be in the rear.
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the lighter trailer should be in the rear.
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