SOUTH DAKOTA CDL COMBINATION PRACTICE TEST
11.
When checking the lights before driving:
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you should turn off the engine.
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the engine must be running.
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make sure the parking brake is not set.
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you should check them from inside the vehicle.
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12.
An Anti-lock Braking System (ABS):
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keeps your wheels from locking up when you brake hard.
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always shortens your stopping distance.
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lets you drive faster.
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increases your normal braking capability.
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13.
The parking brake:
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should be used when driving in bad weather.
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should be used whenever you park.
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should be used when you need to apply the brakes firmly.
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All of the above.
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14.
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 supplies air to the trailer air tanks, and controls the emergency brakes on combination vehicles.
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It tells you the amount of brake pressure you need to stop the vehicle.
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All of the above.
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15.
When driving trucks with trailers, drivers should:
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push the brake pedal to the floor when braking.
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avoid making sudden movements with the steering wheel.
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make quick lane changes.
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decrease their following distance.
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16.
By pushing the trailer air supply control knob in, you:
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keeps air in the tractor or truck brake system.
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supply the trailer with air.
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shut the air off and put on the trailer emergency brakes.
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supply the tires with air.
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17.
When backing a trailer, you should:
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turn the steering wheel in the opposite direction of the turn.
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turn the steering wheel toward the direction you want to go.
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avoid using the brakes.
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try to position your vehicle so you can back on a curved path.
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18.
When backing with a trailer, you should:
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look at your line of travel before you begin backing.
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make pull-ups to re-position your vehicle as needed.
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check your mirrors on both sides frequently.
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All of the above.
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19.
What can cause poor traction?
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Too little weight on the driving axles.
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Too much weight on the steering axle.
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Overloading the truck.
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All of the above.
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20.
If your trucks has a high center of gravity, which of the following is true for curves?
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You should slow down, as your truck can roll over at the posted speed limit for the curve.
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Reduce your speed to a crawl.
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You should travel at the posted speed limit.
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None of the above.
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