CDL DOUBLES TRIPLES PRACTICE TEST NORTH CAROLINA
11.
Most heavy-duty vehicles use:
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air brakes.
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pressure brakes.
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solid brakes.
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hydraulic brakes.
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12.
Strong winds can make it difficult to stay in your lane, especially when:
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driving at speeds below 40 mph.
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driving alongside other vehicles.
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going into tunnels.
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coming out of tunnels.
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13.
Retarders:
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improve gas mileage.
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reduce the danger of slipping.
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help slow a vehicle, reducing the need for using brakes.
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reduce braking distance.
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14.
During a walk around inspection of a double or triple trailer, make sure that the converter dolly air tank drain valve is _____ and the glad hands are ______.
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closed; not connected
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open; properly connected
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open; not connected
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closed; properly connected
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15.
Which of the following is not proper tie-down equipment:
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Bungee cords
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Chains
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Straps
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Ropes
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16.
Empty trucks:
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may have poor traction.
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require shorter stopping distances than fully-loaded trucks.
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have better traction than fully-loaded trucks.
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None of the above.
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17.
An item that is 15 feet long placed on a flatbed trailer should have at least:
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3 tie-downs.
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15 tie-downs.
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2 tie-downs.
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1 tie-down.
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18.
The trolley valve should be used only:
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to test the trailer brakes.
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in driving.
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in an emergency.
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to prevent skids.
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19.
If an aggressive driver is involved in an accident down the road, you should:
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try to get their vehicle to the side of the road.
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confront the aggressive driver.
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make eye contact with the driver.
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stop a safe distance from the accident scene, wait for the police and report the behavior you witnessed.
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20.
Doubles and triples:
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can't be turned suddenly.
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can be turned suddently due to the low center of gravity.
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have a lower chance of skidding.
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can be stopped suddenly due to their weight.
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