COMBINATION PRACTICE TEST - NC CDL
11.
A bridge formula permits:
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less maximum axle weight for axles that are close together.
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less maximum axle weight for axles that are far apart.
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more maximum axle weight for axles that are far apart.
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more maximum axle weight for axles that are closer together.
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12.
Inspecting the fifth-wheel does NOT include:
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checking for missing or damaged parts.
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checking the area around the vehicle.
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making sure that the fifth-wheel plate is greased as required.
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ensuring the fifth wheel is in the proper position for coupling.
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13.
During a trip:
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you should not watch gauges as they can be misleading.
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you should watch gauges for signs of trouble.
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you should watch gauges to make sure that valve caps are not missing.
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None of the above.
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14.
Which of the following is NOT part of testing the tractor protection valve?
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Stepping on and off the brake pedal several times to reduce the air pressure in the tanks.
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Pulling forward slowly, then applying the trailer brakes.
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Charging the trailer air brake system.
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Shutting off the engine.
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15.
To know how much space you should keep in front of you when driving at speeds below 40 mph, one good rule says you need at least ______ for each ______ of vehicle length.
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2 seconds; 10 feet
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1 second; 5 feet
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3 seconds; 50 feet
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1 second; 10 feet
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16.
Most truck driver deaths in crashes result from:
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off-tracking.
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truck rollovers.
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following too closely.
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driving side-by-side with another truck.
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17.
How do you find out how many seconds of following distance you have?
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Wait until the vehicle ahead of you passes a pavement marking, shadow or landmark. Then count off the seconds until you reach the same spot.
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Pass a stationary object and count how many seconds it takes the vehicle ahead of you to reach the same spot.
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Wait until the vehicle ahead of you passes a pavement marking or some other clear landmark, then use the stopwatch on your mobile phone to see how long it takes you to reach the same spot.
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None of the above.
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18.
In combination vehicles with air brakes, the trailer air supply control:
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supplies air to the trailer air tanks.
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is used to control the tractor protection valve.
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is a coupling devices used to connect the service and emergency air-lines from the tractor to the trailer.
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is used to keep the trailer behind the tractor.
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19.
What is the emergency air line for?
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It controls the front brakes of the tractor in case of an emergency.
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It tells you the amount of brake pressure you need to stop the vehicle.
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It supplies air to the trailer air tanks, and controls the emergency brakes on combination vehicles.
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All of the above.
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20.
When inspecting the cargo, make sure it is:
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secured properly for the first 50 miles after beginning a trip.
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piled up.
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not overloaded.
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All of the above.
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