NORTH CAROLINA CDL COMBINATION PRACTICE TEST
11.
By pushing the trailer air supply control knob in, you:
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shut the air off and put on the trailer emergency brakes.
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supply the trailer with air.
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keeps air in the tractor or truck brake system.
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supply the tires with air.
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12.
When driving on slippery roads, you should NOT:
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watch far enough ahead to keep a steady speed.
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try to anticipate stops early.
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go slowly.
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use the engine brake.
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13.
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 low center of gravity.
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a very stable load if properly distributed.
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a very unstable load with a high center of gravity.
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14.
If your cargo only fills one-third of the length of your trailer, make sure your cargo is:
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piled up high with heavy cargo on top.
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centered and spread out as much as possible.
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loaded so there is a high center of gravity.
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to one side and as close to the ground as possible.
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15.
Before transporting sealed loads, you should check:
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the special transit permit.
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that you don't exceed gross weight and axle weight limits.
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a small sample of whatever is inside.
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None of the above.
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16.
ABS helps you:
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steer gently and smoothly while you are braking.
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avoid wheel lock up and maintain control of your vehicle when you brake.
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increase your normal braking capability.
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stop much faster.
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17.
Most hydraulic brake failures occur for one of two reasons, one of which is:
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loss of hydraulic pressure.
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driving in cold weather.
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excessive downshifting.
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relying too much on the engine braking effect.
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18.
When backing a trailer, you should:
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try to position your vehicle so you can back in a straight line.
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never make pull-ups to reposition your vehicle.
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turn the steering wheel in the direction you want to go.
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avoid correcting the drift.
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19.
To prevent a rollover, you should keep the cargo as close to the ground as possible and:
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go slowly around turns.
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make sure that the release arm is in the engaged position.
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keep an eye on your tires.
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keep the vents clear so they work correctly.
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20.
Poor weight balance:
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improves handling.
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can make vehicle handling more difficult.
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increases fuel efficiency.
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makes it easier to turn.
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