CDL COMBINATION PRACTICE TEST (WA)
11.
If you unlock the pintle hook with the dolly still under the rear trailer:
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your vehicle might roll away.
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the brakes could be damaged by the combined forces of the springs and the air pressure.
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the dolly tow bar may fly up.
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12.
One way to prevent hydroplaning is to:
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make sure you have enough tread on your tires.
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take curves at higher speeds.
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have less than 4/32 inch tread depth in every major groove on front tires.
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13.
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 safety chain.
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the emergency and service air lines.
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14.
At speeds below 40 mph, you should leave at least one second in front of you for each ___ feet of vehicle length.
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10
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20
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5
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15.
Under a pressurized system, the radiator cap:
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should be removed when the coolant is hot.
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should never be removed until the system has cooled.
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should never be hot.
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16.
If you get stuck on railroad tracks, you should:
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have a helper push your vehicle.
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get out of the vehicle and away from the tracks.
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stay in the vehicle and call for help.
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17.
Before starting down a hill, you should:
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release the accelerator and shift to Neutral at the same time.
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slow down and shift to a lower gear.
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look for an escape route.
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18.
If a load is placed on one side of the trailer:
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the steering axle weight will be too light to steer safely.
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a rollover is more likely.
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making turns may be easier.
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19.
If you let air out of hot tires:
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the tires will cool off much sooner.
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as the tire cools, the air pressure will be too low.
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air pressure will increases, causing the tires to blow out.
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20.
The center of gravity of a trailer should be:
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as low as possible.
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at the rear of the trailer.
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as high as possible.
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