CDL COMBINATION PRACTICE TEST (UT)
11.
To prevent rollover, you should:
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drive slowly around on ramps and off ramps.
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go slowly around turns.
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keep the cargo as close to the ground as possible.
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All of the above.
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12.
What is countersteering?
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Driving too fast for conditions.
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Locking your wheels while turning in an emergency situation.
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Staying off the brake while steering to the right to avoid an accident.
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Turning the steering wheel quickly the other way after steering in an emergency situation.
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13.
When backing a tractor under a trailer:
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the trailer will be lifted slightly when the tractor backs under it.
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you should lift the
trailer off the fifth-wheel.
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the fifth-wheel will come out from under the trailer.
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the end of the kingpin will be even with the top of the fifth wheel.
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14.
On
a tractor-trailer equipped with a trailer brake hand
valve, the hand valve can be used to:
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reduce the chance of the front wheels skidding.
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prevent movement of cargo.
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keep from rolling back.
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hold compressed air.
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15.
Axle weight is:
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the value specified by the manufacturer as the loaded weight of one axle.
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the weight of all the axles added together.
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the weight transmitted to the ground by one axle or one set of axles.
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the maximum safe weight your tires can carry at a specified pressure.
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16.
You are coupling a tractor to a semi-trailer. You have backed up but are not yet under the trailer. Before backing under the semi-trailer, you should:
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connect the electrical cord and check the air lines.
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begin raising the landing gear.
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supply air to the trailer system and lock the trailer brakes.
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remove the wheel chocks.
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17.
Rollovers happen when drivers:
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stop too often.
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brake too hard.
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turn too slowly.
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turn too fast.
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18.
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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19.
The iron trailer supports are up, and the full weight of the trailer is resting on the tractor. Make sure:
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you are in a low enough gear.
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there is enough clearance between the upper and lower fifth wheel.
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the safety latch is not engaged.
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there is enough clearance between the rear of the tractor frame and the landing gear.
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20.
When backing a trailer, you should:
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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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turn the steering wheel toward the direction you want to go.
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try to position your vehicle so you can back on a curved path.
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