CDL DOUBLES PRACTICE TEST NORTH CAROLINA
11.
If during vehicle inspection a tire is too hot to touch, you should:
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remain stopped until the tire cools off.
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make sure there is enough engine oil on the tires.
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immediately decrease air pressure.
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let air out.
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12.
If your vehicle is equipped with air brakes, loss of air pressure in the emergency line will cause:
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the trailer supply valve to open.
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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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13.
Retarders:
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help slow a vehicle and reduce brake wear.
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help prevent accidents by applying extra braking power to the non-drive wheels.
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apply their
braking power whenever
you push on the accelerator.
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All of the above.
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14.
Blocking and bracing are:
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used to keep cargo from sliding and to prevent movement of cargo.
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coupling devices used to connect the service air lines from the truck or tractor to the trailer.
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driving techniques used to regain control when your drive wheels start to skid.
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None of the above.
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15.
When driving in very hot weather, you may have to:
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increase your speed until the tires cool off.
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reduce your speed to prevent overheating.
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decrease your following distance.
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watch out for black ice.
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16.
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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strong wind.
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worn tire tread.
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rearward amplification.
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the rear trailer of a triple.
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17.
Doubles:
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are easier to drive than straight trucks.
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are less likely to rollover than straight trucks.
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require more reaction time than straight trucks.
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None of the above.
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18.
After an accident, an improper use of flares could cause:
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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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a fire if spilled fuel is on the ground.
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air pressure to build from 50 to 100 psi within 2 minutes.
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19.
When backing, you should:
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avoid using the mirrors.
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back and turn toward the right side.
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use a helper if possible.
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back quickly.
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20.
When transporting cargo, cargo securement must be checked within the first _____ miles of a trip and every _____ miles after.
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50; 150
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150; 250
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50; 250
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100; 150
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