DC CDL DOUBLES TRIPLES PRACTICE TEST
11.
When a tire fails, you should:
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stay off the brake.
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brake in a way that will keep your
vehicle in a straight line.
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push the brake pedal down gradually.
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apply the brakes as hard as you can without locking the wheels.
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12.
Texting while operating a commercial motor vehicle is:
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only allowed at night.
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illegal.
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acceptable if you are contacting your dispacther.
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acceptable if you are contacting your supervisor.
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13.
In vehicles with air brakes, the two markings on a front brake limiting valve are:
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wet and dry.
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normal and slippery.
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left and right.
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high and low.
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14.
What factors can cause brakes to fade?
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Gravel and tar.
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Slippery surfaces and shaded areas.
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Excessive heat and brakes out of adjustment.
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Dirt roads and in unpaved yards.
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15.
The last trailer of triples is ______ as likely to turn over as a five-axle tractor.
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twice
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5 times
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3.5 times
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4 times
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16.
When making a turn you should:
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honk your horn.
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signal early.
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turn the signal off before entering the turn.
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make gestures to get the attention of other drivers.
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17.
Hydroplaning:
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can occur only if there is a lot of water on the road.
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can occur at speeds as low as 10 mph, if there is a lot of water.
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can occur at speeds as low as 30 mph.
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is less likely if tire pressure is low.
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18.
When driving at night you should dim your lights when following another vehicle within:
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50 feet.
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100 feet.
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1 mile.
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500 feet.
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19.
Which of the following is a reason to cover cargo?
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To protect the cargo from weather
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To protect people from spilled cargo
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To contain a spill
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All of the above.
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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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white.
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blue.
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red.
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yellow.
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