IN CDL COMBINATION TEST - PRACTICE TEST
11.
When you are uncoupling a loaded trailer, lower the landing gear until:
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makes contact with the ground, and leave the trailer off the fifth wheel.
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the tractor frame is under the trailer.
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the pressure in the system is above 55 psi.
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it makes firm contact with the ground.
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12.
You should always try to back toward the driver's side because:
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you can watch the rear of your vehicle out the side window.
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backing toward the left side is more dangerous.
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you can more easily correct any steering errors.
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None of the above.
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13.
When a vehicle goes around a corner, the rear wheels:
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follow the same path as the front wheels.
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will turn freely.
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follow a different path than the front wheels.
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will lock up.
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14.
If you cannot make a right turn without entering another traffic lane, you should:
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watch out for vehicles coming toward you and back up for them.
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turn wide before you start the turn.
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turn wide as you complete the turn.
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swing wide to the left before starting the turn.
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15.
Which of the following trailers can get stuck on raised crossings?
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Moving van
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Lowboy
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Car carrier
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All of the above.
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16.
Before connecting the converter dolly to the rear trailer, make sure that:
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the locking jaws rest on the kingpin.
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the trailer height is slightly lower than the center of the fifth-wheel.
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the shut-off valves at the rear of the first trailer are open.
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the kingpin rests on the fifth-wheel.
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17.
When backing a trailer, you should:
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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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turn the steering wheel in the opposite direction of the turn.
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try to position your vehicle so you can back on a curved path.
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18.
You are coupling a tractor to a semi-trailer and have backed up but are not yet under the trailer. Before backing under the semi-trailer, you should hook up:
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the electrical service cable.
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the landing gear.
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the safety chain.
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the emergency and service air lines.
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19.
When parking, you should choose a spot:
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that allows you do a walk around inspection.
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that allows you to pull forward when you leave.
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that requires backing up.
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All of the above.
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20.
The center of gravity of a trailer should be:
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at the rear of the trailer.
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at the front of the trailer.
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as low as possible.
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as high as possible.
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