COMBINATION PRACTICE TEST - WI CDL
11.
Strong winds can make it difficult to stay in your lane especially when driving:
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vehicles with ABS.
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heavier vehicles.
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lighter vehicles.
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flatbed trailers.
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12.
If your vehicle catches fire, you should pull over:
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in an open area.
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near other vehicles.
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near trees.
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at a service station.
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13.
When coupling, you should:
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make sure the sliding fifth-wheel is locked.
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be aware that wrong coupling and uncoupling can be very dangerous.
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make sure the trailer wheels are not chocked.
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make sure the trailer kingpin is bent.
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14.
When the wheels of a trailer lock up, the trailer will tend to swing around. This is more likely to happen when:
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the trailer is fully loaded.
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the trailer is empty or lightly loaded.
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the trailer is overloaded.
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None of the above.
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15.
If your trailer starts to skid, you should:
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steer in the opposite direction.
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lock the brakes.
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release the brakes.
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pump the brakes.
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16.
When the ______ closes, it stops any air from going out of the tractor.
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height control valve
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alcohol evaporator
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hand valve
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tractor protection valve
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17.
The emergency air line does NOT:
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pump air into the relay valves, allowing the trailer brakes to be applied more quickly.
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supply air to the trailer air tanks.
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control the emergency brakes on combination vehicles.
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cause the tractor protection valve to close when the emergency line loses pressure.
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18.
If your truck has automatic transmission, you should downshift:
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after entering a curve.
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when going down grades.
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when you need to accelerate.
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whenever road conditions allow.
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19.
If your cargo only fills one-third of the length of your trailer, make sure your cargo is:
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to one side and as close to the ground as possible.
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loaded so there is a high center of gravity.
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piled up high with heavy cargo on top.
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centered and spread out as much as possible.
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20.
A bridge formula permits less maximum axle weight for axles that:
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are closer together
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have a high center of gravity
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are further apart than normal
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have poor weight balance
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