CDL COMBINATION PRACTICE TEST NORTH CAROLINA
11.
When coupling a tractor to a semi-trailer, after checking if the fifth-wheel is in proper position for coupling you should:
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connect the air lines to the trailer.
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secure the vehicle.
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connect the electrical cord and check the air lines.
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make sure the area around the vehicle is clear and the trailer wheels are chocked.
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12.
The service line:
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carries air and is connected to relay valves which allow the trailer brakes to be applied more quickly.
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carries power steering fluid to control the trailer brakes.
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carries air to the parking brake to control the trailer brakes.
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None of the above.
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13.
The crack-the-whip effect:
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can cause a vehicle to tilt.
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can turn the trailer over.
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the ends of some vehicles to drag.
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can cause problems for drivers coming toward you.
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14.
Most heavy vehicles require ________ change gears.
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single clutching
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double clutching
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triple shifting
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double shifting
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15.
Hydroplaning:
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only occurs at extremely high speeds.
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never occurs at speeds below 40 mph.
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only happens when tire pressure is higher than normal.
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can occur at speeds as low as 30 mph.
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16.
When backing a trailer, if you turn the wheel left:
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the cab will go left and the trailer will go right.
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the cab and the trailer will go left.
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the cab will go right and the trailer will go left.
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the cab and the trailer will go right.
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17.
Older trailers do not have spring brakes. If the air supply leaks away:
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there will be no emergency brakes.
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the ABS won't work properly.
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the trailer will stop normally.
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All of the above.
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18.
When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
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worn tire tread.
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the rear trailer of a triple.
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strong wind.
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rearward amplification.
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19.
Weight that is loaded so there is a high center of gravity:
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causes greater chance of rollover.
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reduces the chance that the load will shift to the side or fall off.
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makes a vehicle easier to handle.
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All of the above.
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20.
After starting the engine, oil pressure should rise to a normal level:
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within 2 minutes.
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within 6 minutes.
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within 3 miles.
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within seconds.
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