CDL COMBINATION PRACTICE TEST MISSISSIPPI
11.
Emergency lines on combination vehicles are often coded with the color ____ to keep from getting them mixed up with the ____ service line.
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blue; red
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yellow; black
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red; yellow
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red; blue
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12.
Strong winds can make it difficult to stay in your lane especially when driving:
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flatbed trailers.
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lighter vehicles.
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heavier vehicles.
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vehicles with ABS.
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13.
When you use your mirrors while driving on the road, you should:
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stare for a long time at the mirror.
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only use the driver's side mirror.
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avoid checking them regularly.
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check them quickly.
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14.
If a trailer does not have spring brakes, to keep the trailer from moving you should:
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use the service brakes.
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use wheel chocks.
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close the brake valve.
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park on a slight decline.
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15.
Combination vehicles usually require _________ single commercial vehicles.
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the same level of skill as
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more driving skill than
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less driving skill than
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None of the above.
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16.
The emergency air line does NOT:
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supply air to the trailer air tanks.
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pump air into the relay valves, allowing the trailer brakes to be applied more quickly.
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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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17.
In a vehicle with a dual air brake system:
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both systems typically operate the regular brakes on the rear axle.
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one system supplies air to the trailer.
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each system has its own air tanks.
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All of the above.
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18.
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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19.
If the drive wheels start to skid:
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push in the clutch to let them turn freely.
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accelerate slightly to regain control.
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use the brakes to slow down.
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All of the above.
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20.
When you are driving on a slippery road, you should NOT:
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adjust turning and braking to road conditions.
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use the engine brake or speed retarder.
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keep a longer following distance.
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take curves at slower speeds.
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